Continental Summary

A week featuring Turkey Vulture, Pacific-slope Flycatcher, Common Yellowthroat, Green-tailed Towhee, and Vesper Sparrow in light to moderate movements to begin and end the period are in store for the West, while moderate to heavy flights featuring Ruby-throated Hummingbird, Acadian Flycatcher, Blue-headed Vireo, Philadelphia Vireo, Gray Catbird, Brown Thrasher, Tennessee Warbler, Bay-breasted Warbler, American Redstart, Summer Tanager, and Baltimore Oriole begin and end the period in the East.

Wondering what species are migrating through right now? Check out our analysis for the past 7 days.

Arrows show wind speed and direction (arrow points in the direction to which wind is blowing) 100 m above ground level. Areas with southerly winds are colored red; northerly winds colored blue. Accumulated precipitation (in 6 hour intervals) is green, outlined by white. Broadly speaking, areas of the map in blue will experience conditions that are favorable for migration, and areas where blue and green (and red and blue) intersect and overlap may experience migrant concentrations and fallouts as migrants interact with precipitation.

We use data collected by eBird users help make more accurate forecasts. If you enjoy the predictions contained in these posts, please consider submitting your own bird sightings to eBird to even further improve the content. Every observation counts, whether it be a single bird at a feeder in your backyard, or an entire day spent in a national park. To get started with eBird, head on over to the site!

Need a review of our definitions for regions, species on the move, and migration amounts? Please visit this link.

Quick Links to Regions

Upper Midwest and Northeast

With the passage of a frontal boundary and the arrival of another, the region will see many areas with moderate, heavy and even very heavy flights for the weekend followed by a period of much reduced migration. By Monday the flights will be restricted to New England, primarily, as southerly flow and warmer temperatures build in behind high pressure moving east. Flights will continue in New England into the middle of the work week, but by Wednesday night almost the entire region will be under the influence of southerly flow. Migration will be light and scattered, with some higher densities where winds are light, particularly along the coast. The period ends with the arrival of another disturbance moving across the Great Lakes, bringing a new wave of moderate to heavy flights to the Upper Midwest and Great Lakes.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Northern Harrier ** 8/1 9/26 10/20 11/10 11/27 Wilson's Snipe * 8/6 10/1 10/16 11/2 11/19 Northern Shoveler ** 8/9 10/15 11/10 12/1 12/16 Monk Parakeet * 8/24 9/23 11/4 12/10 - Northern Pintail ** 9/1 10/3 10/31 11/20 12/11 Sedge Wren * 9/1 9/20 10/5 10/24 11/1 Marsh Wren NA 9/1 9/20 10/5 10/24 - Lapland Longspur * 9/3 9/15 11/10 - - Great Cormorant * 9/3 11/12 After Dec 31 - - Eastern Phoebe *** 9/4 9/16 9/30 10/20 11/3 Palm Warbler *** 9/4 9/18 10/5 10/22 11/4 American Pipit ** 9/5 9/21 10/22 11/17 12/4 Clay-colored Sparrow * 9/5 9/17 10/4 10/21 11/3 Peregrine Falcon ** 9/6 9/20 10/5 10/22 11/3 Blue-headed Vireo *** 9/6 9/19 10/4 10/21 11/2 Lincoln's Sparrow *** 9/7 9/19 10/5 10/22 11/2 Song Sparrow NA 9/8 10/10 10/20 11/1 - Harris's Sparrow * 9/8 9/22 10/12 10/28 11/10 American Wigeon ** 9/9 10/5 11/1 11/23 12/19 Eastern Bluebird *** 9/9 9/25 10/19 11/11 11/29 Indigo Bunting *** 9/9 9/14 9/24 10/11 10/23 Yellow-bellied Sapsucker *** 9/10 9/22 10/7 10/21 10/31 Savannah Sparrow *** 9/10 9/24 10/12 10/29 11/12 American Robin *** 9/11 9/25 10/13 11/9 11/26 Cackling Goose * 9/12 10/1 12/8 - - Pied-billed Grebe *** 9/12 10/10 10/31 11/22 12/11 Eastern Towhee *** 9/12 9/23 10/6 10/25 11/7 Winter Wren *** 9/14 9/28 10/17 10/31 11/12 Orange-crowned Warbler ** 9/14 9/25 10/10 10/25 11/5 Nelson's Sparrow * 9/14 9/25 10/10 10/25 11/4 Dunlin ** 9/15 10/9 10/31 11/20 12/6 Brown Creeper *** 9/15 9/28 10/17 10/30 11/9 Saltmarsh Sparrow NA 9/15 10/10 10/20 11/5 11/15 Ruby-crowned Kinglet ****! 9/16 9/28 10/14 10/30 11/11 Yellow-rumped Warbler ****! 9/16 9/27 10/13 10/28 11/9 Swamp Sparrow ****! 9/16 9/28 10/14 10/30 11/12 White-throated Sparrow ****! 9/16 9/29 10/19 11/2 11/13 Le Conte's Sparrow * 9/17 9/29 10/15 10/31 11/12 Eastern Meadowlark ** 9/17 9/29 10/16 11/2 11/17 Snow Goose * 9/18 11/21 12/26 - - Golden-crowned Kinglet ****! 9/18 9/30 10/18 11/2 11/15 Chipping Sparrow *** 9/18 9/27 10/9 10/30 11/13 Rusty Blackbird ** 9/18 10/3 10/23 11/10 11/25

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Belted Kingfisher ** Before July 1 7/27 9/20 10/14 - Green-winged Teal ** 8/8 8/22 10/27 11/22 12/10 Ovenbird ** 8/11 8/26 9/13 10/2 10/14 Wilson's Warbler *** 8/15 8/26 9/11 9/28 10/9 American Redstart *** 8/12 8/27 9/11 9/30 10/12 Sora * 8/12 8/28 9/21 10/16 10/30 Black-and-white Warbler *** 8/10 8/28 9/13 10/2 10/14 Yellow-throated Warbler * 8/19 8/29 9/12 9/30 10/12 Wood Thrush ** 8/23 8/30 9/11 9/28 10/15 Tennessee Warbler *** 8/16 8/30 9/16 10/4 10/18 Red-headed Woodpecker * 8/22 9/1 9/13 10/2 10/14 Magnolia Warbler *** 8/20 9/1 9/17 10/3 10/15 Bald Eagle * Before July 1 9/2 11/6 - - Sabine's Gull * 8/22 9/2 9/16 10/1 10/10 Bay-breasted Warbler *** 8/22 9/2 9/16 10/2 10/13 Scarlet Tanager *** 8/23 9/2 9/15 10/3 10/15 Philadelphia Vireo *** 8/22 9/3 9/17 10/2 10/12 Common Yellowthroat *** 8/25 9/3 9/18 10/9 10/24 Summer Tanager * 8/25 9/3 9/16 10/3 10/15 Merlin ** 8/19 9/4 9/28 10/26 11/16 House Wren ** 8/28 9/4 9/15 10/7 10/23 Swainson's Thrush *** 8/24 9/4 9/19 10/5 10/16 Cape May Warbler ** 8/22 9/4 9/19 10/5 10/17 Turkey Vulture *** 8/16 9/5 9/28 10/31 11/25 Red-shouldered Hawk ** 8/24 9/5 9/22 11/13 11/22 Broad-winged Hawk ** 8/26 9/5 9/18 10/3 10/14 Nashville Warbler *** 8/22 9/5 9/21 10/9 10/23 Connecticut Warbler * 8/25 9/5 9/19 10/5 10/16 Pine Warbler ** 8/22 9/5 9/22 10/11 10/25 Black-throated Green Warbler *** 8/24 9/5 9/20 10/7 10/19 Rose-breasted Grosbeak *** 8/26 9/5 9/16 10/3 10/14 Parasitic Jaeger * 8/23 9/6 9/25 11/15 11/30 Gray Catbird *** 8/28 9/6 9/17 10/9 10/24 Northern Parula *** 8/25 9/6 9/20 10/6 10/18 Black-throated Blue Warbler *** 8/22 9/6 9/23 10/12 10/26 Brown Thrasher *** 8/27 9/7 9/21 10/7 10/20 Blackpoll Warbler *** 8/27 9/7 9/23 10/9 10/21 Blue Jay ****! 8/25 9/8 9/28 10/16 - Gray-cheeked Thrush ** 8/29 9/8 9/23 10/8 10/19 Northern Flicker *** 8/28 9/9 9/26 10/13 10/30 Red-breasted Nuthatch ** 8/9 9/9 10/2 - - Sharp-shinned Hawk *** 8/26 9/10 10/7 11/8 11/22 Cooper's Hawk *** 8/3 9/10 10/7 11/2 11/16 American Kestrel ** 8/27 9/10 9/28 10/19 11/5 Indigo Bunting ** 9/9 9/14 9/24 10/11 10/23 Lapland Longspur * 9/3 9/15 11/10 - - Eastern Phoebe *** 9/4 9/16 9/30 10/20 11/3 Clay-colored Sparrow * 9/5 9/17 10/4 10/21 11/3 Palm Warbler *** 9/4 9/18 10/5 10/22 11/4

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Yellow-billed Cuckoo * - - Before July 1 10/3 10/17 Black Skimmer * - Before July 1 7/23 9/22 10/21 Common Gallinule * - Before July 1 7/26 9/12 11/2 Whimbrel * Before July 1 7/9 8/1 9/18 10/4 Killdeer *** - Before July 1 8/2 10/28 11/26 Yellow-crowned Night-Heron * - Before July 1 8/3 10/8 10/28 Chimney Swift *** - - 8/5 10/10 10/25 Snowy Egret ** - Before July 1 8/7 10/15 11/3 Great Blue Heron *** - Before July 1 8/10 10/19 12/8 Tricolored Heron * 7/14 7/26 8/11 10/7 10/22 Great Egret *** Before July 1 7/11 8/12 10/19 11/6 Green Heron *** - Before July 1 8/13 9/15 10/7 Laughing Gull ** Before July 1 7/15 8/13 11/12 12/5 Osprey *** - Before July 1 8/16 10/15 11/8 Pectoral Sandpiper ** Before July 1 7/18 8/16 9/24 11/20 Forster's Tern * - Before July 1 8/17 9/18 11/30 Cedar Waxwing *** - Before July 1 8/17 9/27 11/26 Wood Duck ** Before July 1 7/6 8/18 10/31 11/21 Least Sandpiper *** - Before July 1 8/18 9/11 9/25 Greater Yellowlegs ** - Before July 1 8/20 9/11 11/28 Caspian Tern ** Before July 1 7/17 8/20 9/14 10/20 Stilt Sandpiper * Before July 1 7/15 8/21 9/11 9/25 Western Sandpiper * Before July 1 7/15 8/24 9/17 10/1 Black Tern ** Before July 1 8/14 8/25 9/12 9/24 Great Crested Flycatcher *** 8/12 8/17 8/25 9/14 9/26 Blue-gray Gnatcatcher *** 8/4 8/14 8/25 9/15 9/29 Worm-eating Warbler * 8/1 8/11 8/25 9/12 9/24 Royal Tern * 7/12 7/31 8/25 11/10 11/25 White-rumped Sandpiper * 7/22 8/6 8/26 9/13 9/28 Red-necked Phalarope * 7/28 8/11 8/27 9/13 9/27 Red Knot * - Before July 1 8/28 9/15 9/28 Ruby-throated Hummingbird *** 7/30 8/14 8/28 9/21 10/5 Blue-winged Warbler ** 8/1 8/13 8/28 9/14 9/27 Eastern Wood-Pewee *** 8/5 8/16 8/29 9/22 10/9 Baird's Sandpiper ** 8/6 8/17 8/30 9/15 9/25 Eastern Whip-poor-will * 8/16 8/21 8/30 9/19 10/2 Olive-sided Flycatcher * 8/4 8/16 8/30 9/15 9/27 Canada Warbler ** 8/5 8/16 8/30 9/15 9/26 Common Nighthawk *** 8/7 8/17 8/31 9/14 9/25 Kentucky Warbler * 8/15 8/21 8/31 9/17 9/29 Bobolink ** 8/5 8/16 8/31 9/19 10/15 Sanderling ** - Before July 1 9/1 9/23 10/6 Mourning Warbler * 8/4 8/15 9/1 9/21 10/7 Buff-breasted Sandpiper * 8/10 8/20 9/3 9/17 9/28 Least Flycatcher ** 8/7 8/18 9/3 9/22 10/5 Warbling Vireo *** 8/13 8/21 9/3 9/19 9/30 Double-crested Cormorant *** - - 9/5 11/14 12/7 Yellow-bellied Flycatcher * 8/9 8/20 9/5 9/21 10/4 Veery ** 8/13 8/22 9/5 9/22 10/5 Red-eyed Vireo *** 8/15 8/25 9/7 9/28 10/13 Golden-winged Warbler * 8/11 8/22 9/7 9/23 10/5 Yellow-throated Vireo ** 8/16 8/25 9/8 9/26 10/8 Blackburnian Warbler *** 8/10 8/23 9/8 9/27 10/9 Blue-winged Teal ** 8/4 8/18 9/9 10/22 11/6 Hooded Warbler * 8/17 8/26 9/9 9/27 10/10 Chestnut-sided Warbler *** 8/11 8/24 9/9 9/27 10/9 Prairie Warbler * 8/4 8/21 9/9 9/30 10/13 American Golden-Plover * 8/11 8/23 9/10 9/27 10/13 White-eyed Vireo *** 8/17 8/27 9/10 9/28 10/10 Northern Waterthrush ** 7/28 8/24 9/10 9/30 10/12 Wood Thrush ** 8/23 8/30 9/11 9/28 10/15 American Redstart *** 8/12 8/27 9/11 9/30 10/12 Wilson's Warbler *** 8/15 8/26 9/11 9/28 10/9 Yellow-throated Warbler * 8/19 8/29 9/12 9/30 10/12 Red-headed Woodpecker * 8/22 9/1 9/13 10/2 10/14 Ovenbird *** 8/11 8/26 9/13 10/2 10/14 Black-and-white Warbler *** 8/10 8/28 9/13 10/2 10/14 House Wren *** 8/28 9/4 9/15 10/7 10/23 Scarlet Tanager *** 8/23 9/2 9/15 10/3 10/15 Sabine's Gull * 8/22 9/2 9/16 10/1 10/10 Tennessee Warbler *** 8/16 8/30 9/16 10/4 10/18 Bay-breasted Warbler *** 8/22 9/2 9/16 10/2 10/13 Summer Tanager * 8/25 9/3 9/16 10/3 10/15 Rose-breasted Grosbeak *** 8/26 9/5 9/16 10/3 10/14 Philadelphia Vireo *** 8/22 9/3 9/17 10/2 10/12 Gray Catbird *** 8/28 9/6 9/17 10/9 10/24 Magnolia Warbler *** 8/20 9/1 9/17 10/3 10/15 Broad-winged Hawk *** 8/26 9/5 9/18 10/3 10/14 Common Yellowthroat *** 8/25 9/3 9/18 10/9 10/24

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Northern Rough-winged Swallow ** - - Before July 1 8/5 10/24 Wilson's Storm-Petrel * - Before July 1 7/21 8/6 9/22 Glossy Ibis * - Before July 1 7/23 8/17 9/26 Yellow Warbler *** - - Before July 1 8/18 10/7 Little Blue Heron * Before July 1 7/21 8/9 8/26 10/20 Common Tern *** - Before July 1 8/1 8/26 10/4 Black-crowned Night-Heron * - Before July 1 7/31 8/27 10/30 Eastern Kingbird *** - - 8/2 8/27 9/12 Bank Swallow *** - Before July 1 8/1 8/28 9/15 Clapper Rail * - Before July 1 8/1 8/28 10/29 Upland Sandpiper * 7/26 8/1 8/11 8/29 9/12 Ruddy Turnstone ** Before July 1 7/25 8/12 8/29 9/17 Cliff Swallow ** - - Before July 1 8/29 9/18 Tree Swallow *** - - Before July 1 8/30 11/10 Barn Swallow *** Before July 1 7/22 8/4 8/30 9/16 American Oystercatcher * - Before July 1 7/29 8/30 9/25 Blue Grosbeak * Before July 1 7/18 8/5 8/31 10/17 Roseate Tern * - Before July 1 7/20 9/1 9/23 Black-bellied Plover * 7/20 8/1 8/20 9/3 12/1 Mississippi Kite * - - Before July 1 9/4 9/18 Black-necked Stilt * - Before July 1 7/28 9/4 9/19 Spotted Sandpiper *** Before July 1 7/1 8/6 9/5 9/24 Marbled Godwit * 7/22 8/2 8/20 9/5 9/21 Willet ** - Before July 1 7/21 9/6 9/21 Baltimore Oriole *** 7/29 8/7 8/19 9/6 9/18 Semipalmated Plover *** 7/1 7/25 8/17 9/8 10/4 Solitary Sandpiper *** Before July 1 7/11 8/13 9/8 10/7 Lesser Yellowlegs *** - Before July 1 8/18 9/10 9/25 Semipalmated Sandpiper *** 7/1 7/13 8/16 9/10 9/28 Short-billed Dowitcher *** - Before July 1 7/29 9/10 9/23 Wilson's Phalarope * Before July 1 8/7 8/22 9/10 9/22 Prothonotary Warbler * 8/7 8/13 8/21 9/10 9/22 Greater Yellowlegs ** - Before July 1 8/20 9/11 11/28 Stilt Sandpiper ** Before July 1 7/15 8/21 9/11 9/25 Least Sandpiper *** - Before July 1 8/18 9/11 9/25 Common Gallinule * - Before July 1 7/26 9/12 11/2 Black Tern ** Before July 1 8/14 8/25 9/12 9/24 Worm-eating Warbler * 8/1 8/11 8/25 9/12 9/24 White-rumped Sandpiper * 7/22 8/6 8/26 9/13 9/28 Red-necked Phalarope * 7/28 8/11 8/27 9/13 9/27 Caspian Tern ** Before July 1 7/17 8/20 9/14 10/20 Common Nighthawk *** 8/7 8/17 8/31 9/14 9/25 Great Crested Flycatcher *** 8/12 8/17 8/25 9/14 9/26 Blue-winged Warbler ** 8/1 8/13 8/28 9/14 9/27 Green Heron *** - Before July 1 8/13 9/15 10/7 Red Knot * - Before July 1 8/28 9/15 9/28 Baird's Sandpiper ** 8/6 8/17 8/30 9/15 9/25 Olive-sided Flycatcher * 8/4 8/16 8/30 9/15 9/27 Blue-gray Gnatcatcher *** 8/4 8/14 8/25 9/15 9/29 Canada Warbler *** 8/5 8/16 8/30 9/15 9/26 Buff-breasted Sandpiper ** 8/10 8/20 9/3 9/17 9/28 Western Sandpiper * Before July 1 7/15 8/24 9/17 10/1 Kentucky Warbler * 8/15 8/21 8/31 9/17 9/29 Whimbrel * Before July 1 7/9 8/1 9/18 10/4 Forster's Tern * - Before July 1 8/17 9/18 11/30

Gulf Coast and Southeast

Moderate to very heavy flights will grace the region to begin the period, with the extent of these flights gradually shifting to the east through the weekend and into the early part of the work week. By Tuesday favorable conditions persist only in Florida, where moderate to locally heavy flights will continue. But the remainder of the region will see primarily southerly flow and limited movements in most areas. Note, however, that marginal conditions along the Gulf Coast may allow for circum-Gulf flights of moderate to heavy intensity, so birders should watch for these conditions to develop (i.e. easterly flow at the coast, facilitating westerly movements). Thursday and Friday see a return of some favorable conditions primarily east of the Appalachians and in Florida, where moderate to heavy movements will take flight.

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Great Blue Heron ** 7/27 10/21 11/19 - - Cooper's Hawk ** 7/29 9/11 10/24 11/11 11/22 Belted Kingfisher *** 8/12 9/14 10/26 - - Bald Eagle ** 8/21 9/18 After Dec 31 - - Black Vulture ** 8/25 10/15 After Dec 31 - - American Redstart ****! 8/29 9/11 9/28 10/16 10/30 Nashville Warbler *** 8/30 9/13 10/4 10/26 11/15 Cape May Warbler ** 8/31 9/12 9/29 10/16 10/31 Scarlet Tanager *** 8/31 9/12 9/27 10/15 10/28 Tennessee Warbler *** 8/31 9/15 10/3 10/22 11/5 American Avocet * 9/1 10/20 11/5 11/24 12/8 Blue-headed Vireo * 9/1 10/18 12/18 After Dec 31 - Magnolia Warbler *** 9/1 9/14 10/1 10/19 11/1 Clay-colored Sparrow ** 9/2 9/15 10/4 10/21 11/4 Common Yellowthroat *** 9/2 9/16 10/5 10/23 11/6 Sharp-shinned Hawk ** 9/2 9/17 10/28 11/12 11/22 Brown Thrasher *** 9/3 9/18 10/5 10/24 11/7 Merlin *** 9/3 9/17 10/11 11/1 11/18 Swainson's Thrush *** 9/3 9/14 9/29 10/15 10/27 Wood Thrush ** 9/3 9/16 10/2 10/19 10/31 Black-throated Blue Warbler *** 9/5 9/20 10/6 10/25 11/7 Gray-cheeked Thrush ** 9/6 9/17 10/2 10/19 10/30 Northern Mockingbird ****! 9/6 9/20 10/12 - - Scissor-tailed Flycatcher ** 9/6 9/20 10/5 11/1 11/19 Bay-breasted Warbler ** 9/7 9/21 10/7 10/25 11/6 Black-throated Green Warbler *** 9/7 9/22 10/8 10/27 11/9 Eastern Towhee ** 9/7 9/15 10/21 11/8 11/22 Rose-breasted Grosbeak *** 9/7 9/19 10/4 10/21 11/1 American Kestrel *** 9/9 10/7 11/14 - - Peregrine Falcon *** 9/9 9/22 10/8 10/23 11/3 American Bittern * 9/12 10/14 11/25 - - Brown-headed Cowbird ** 9/12 9/26 10/25 11/11 11/22 Gray Catbird ****! 9/12 9/24 10/10 10/26 11/7 Blackpoll Warbler * 9/13 9/25 10/10 10/26 11/6 Northern Flicker ****! 9/14 9/29 10/18 11/2 - Indigo Bunting *** 9/15 9/25 10/9 10/26 11/8 Palm Warbler ****! 9/15 9/29 10/19 11/2 11/12 Red-breasted Nuthatch * 9/15 10/6 11/3 - -

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Black-bellied Plover * 7/23 8/6 11/2 - - Caspian Tern * 7/26 8/13 10/26 11/23 - Blue-gray Gnatcatcher *** 8/4 8/25 9/13 10/1 10/14 Blue-winged Teal ** 8/8 8/25 11/2 - - Swainson's Warbler * 8/14 8/25 9/13 10/5 10/24 Mourning Warbler * 8/15 8/27 9/12 9/28 10/10 Worm-eating Warbler * 8/9 8/29 9/15 10/4 10/17 Baltimore Oriole *** 8/18 8/30 9/14 9/30 10/10 Least Flycatcher ** 8/15 8/30 9/14 10/1 10/13 Ruby-throated Hummingbird *** 7/26 8/30 9/13 10/5 10/20 Yellow-throated Vireo ** 8/16 8/30 9/15 10/3 10/17 Chuck-will's-widow * 8/15 8/31 9/17 10/6 10/20 Summer Tanager *** 8/19 8/31 9/15 10/4 10/19 Yellow-bellied Flycatcher * 8/15 8/31 9/15 10/3 10/15 Acadian Flycatcher ** 8/20 9/1 9/16 10/5 10/18 Blue-winged Warbler * 8/19 9/1 9/17 10/4 10/16 Eastern Wood-Pewee *** 8/16 9/1 9/19 10/12 10/29 Hooded Warbler ** 8/3 9/3 9/20 10/11 10/27 Northern Parula *** 8/7 9/3 9/23 10/17 11/2 Northern Waterthrush *** 8/19 9/3 9/19 10/7 10/21 Warbling Vireo * 8/23 9/3 9/17 10/3 10/14 White-eyed Vireo *** 8/19 9/3 9/20 10/11 10/30 Bobolink * 8/21 9/4 9/21 10/9 10/23 Red-headed Woodpecker ** 8/24 9/4 9/18 10/6 11/11 Wilson's Warbler *** 8/23 9/4 9/19 10/4 10/14 Black-billed Cuckoo * 8/17 9/5 9/26 10/18 11/1 Red-eyed Vireo *** 8/22 9/5 9/19 10/8 10/23 Black-and-white Warbler *** 8/18 9/6 9/26 10/18 11/5 Blackburnian Warbler ** 8/24 9/6 9/22 10/9 10/23 Chestnut-sided Warbler *** 8/25 9/6 9/22 10/10 10/23 Pine Warbler *** 8/13 9/6 10/3 - - Yellow-throated Warbler ** 7/31 9/6 9/26 10/19 11/4 Chimney Swift *** 8/27 9/7 9/20 10/11 10/25 Golden-winged Warbler * 8/27 9/7 9/22 10/7 10/19 Veery ** 8/28 9/7 9/21 10/5 10/16 Prairie Warbler ** 7/23 9/8 9/23 10/13 10/30 Broad-winged Hawk ** 8/28 9/9 9/25 10/13 11/1 Ovenbird *** 8/26 9/9 9/27 10/16 11/2 Sora * 8/29 9/10 12/18 - - American Redstart *** 8/29 9/11 9/28 10/16 10/30 Cooper's Hawk ** 7/29 9/11 10/24 11/11 11/22 Cape May Warbler ** 8/31 9/12 9/29 10/16 10/31 Scarlet Tanager *** 8/31 9/12 9/27 10/15 10/28 Nashville Warbler *** 8/30 9/13 10/4 10/26 11/15 Belted Kingfisher *** 8/12 9/14 10/26 - - Magnolia Warbler *** 9/1 9/14 10/1 10/19 11/1 Swainson's Thrush *** 9/3 9/14 9/29 10/15 10/27 Clay-colored Sparrow * 9/2 9/15 10/4 10/21 11/4 Eastern Towhee ** 9/7 9/15 10/21 11/8 11/22 Tennessee Warbler *** 8/31 9/15 10/3 10/22 11/5 Common Yellowthroat *** 9/2 9/16 10/5 10/23 11/6 Wood Thrush ** 9/3 9/16 10/2 10/19 10/31 Gray-cheeked Thrush ** 9/6 9/17 10/2 10/19 10/30 Merlin ** 9/3 9/17 10/11 11/1 11/18 Sharp-shinned Hawk ** 9/2 9/17 10/28 11/12 11/22 Bald Eagle * 8/21 9/18 After Dec 31 - - Brown Thrasher *** 9/3 9/18 10/5 10/24 11/7

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Black-chinned Hummingbird * - - Before July 1 9/20 10/10 Green Heron ** - - Before July 1 9/20 10/9 Louisiana Waterthrush * - - Before July 1 9/11 9/29 Yellow-crowned Night-Heron * - - Before July 1 9/24 10/21 Eastern Kingbird ** - - 7/4 9/21 10/7 Black-bellied Whistling-Duck * - Before July 1 8/6 9/21 12/6 Black-necked Stilt ** 7/14 7/27 8/11 9/16 11/28 Cattle Egret ** - - 8/12 9/25 - Orchard Oriole ** - - 8/13 9/12 9/30 Gray Kingbird * - - 8/14 9/16 10/11 Stilt Sandpiper * 7/5 7/21 8/15 9/14 11/21 Solitary Sandpiper ** - Before July 1 8/17 9/13 10/5 Spotted Sandpiper ** Before July 1 7/19 8/17 9/12 10/3 Pectoral Sandpiper ** Before July 1 7/26 8/18 9/22 10/8 Baird's Sandpiper * 7/8 7/28 8/20 9/24 10/9 Common Tern * Before July 1 7/20 8/22 9/24 11/9 Wilson's Phalarope * 7/19 8/2 8/22 9/12 10/3 Semipalmated Sandpiper ** Before July 1 7/15 8/23 9/16 10/15 Black Tern *** 7/20 8/8 8/24 9/13 9/27 Least Sandpiper ** Before July 1 7/9 8/25 9/18 - Short-billed Dowitcher * Before July 1 7/3 8/27 9/14 9/25 Cerulean Warbler * 8/1 8/13 8/28 9/14 9/26 Common Nighthawk ** 8/10 8/18 8/28 9/19 10/4 Prothonotary Warbler * 8/2 8/11 8/28 9/23 10/9 Bell's Vireo * 8/8 8/18 8/29 9/23 10/10 Buff-breasted Sandpiper * 7/31 8/14 8/30 9/17 9/30 Bank Swallow ** 8/6 8/17 9/1 9/16 9/28 Brown-crested Flycatcher * 8/16 8/23 9/1 9/20 10/2 Cave Swallow * - - 9/1 9/26 11/26 Great Crested Flycatcher *** 8/11 8/20 9/1 9/20 10/5 Western Sandpiper * Before July 1 7/11 9/1 9/20 10/2 Bullock's Oriole * 8/13 8/21 9/2 9/18 9/30 Dickcissel * 8/10 8/19 9/2 9/24 10/16 Kentucky Warbler * 8/4 8/15 9/2 9/24 10/9 Alder Flycatcher * 8/4 8/17 9/3 9/20 10/4 American Golden-Plover * 8/10 8/21 9/5 9/20 10/1 Olive-sided Flycatcher * 8/6 8/19 9/5 9/23 10/7 White-rumped Sandpiper * 8/8 8/20 9/5 9/22 10/5 Willow Flycatcher * 8/5 8/19 9/5 9/25 10/9 Yellow Warbler *** 7/29 8/16 9/7 9/29 10/15 Yellow-breasted Chat ** 8/13 8/23 9/7 9/25 10/9 Canada Warbler ** 8/13 8/24 9/9 9/26 10/9 Mourning Warbler * 8/15 8/27 9/12 9/28 10/10 Blue-gray Gnatcatcher *** 8/4 8/25 9/13 10/1 10/14 Ruby-throated Hummingbird *** 7/26 8/30 9/13 10/5 10/20 Swainson's Warbler * 8/14 8/25 9/13 10/5 10/24 Baltimore Oriole *** 8/18 8/30 9/14 9/30 10/10 Least Flycatcher ** 8/15 8/30 9/14 10/1 10/13 Summer Tanager *** 8/19 8/31 9/15 10/4 10/19 Worm-eating Warbler ** 8/9 8/29 9/15 10/4 10/17 Yellow-bellied Flycatcher * 8/15 8/31 9/15 10/3 10/15 Yellow-throated Vireo *** 8/16 8/30 9/15 10/3 10/17 Acadian Flycatcher ** 8/20 9/1 9/16 10/5 10/18 Blue-winged Warbler ** 8/19 9/1 9/17 10/4 10/16 Chuck-will's-widow * 8/15 8/31 9/17 10/6 10/20 Warbling Vireo * 8/23 9/3 9/17 10/3 10/14 Red-headed Woodpecker ** 8/24 9/4 9/18 10/6 11/11

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Cliff Swallow ** - - Before July 1 7/8 10/7 Least Bittern * - - Before July 1 8/1 10/18 Cassin's Sparrow * - - Before July 1 8/19 9/15 Blue Grosbeak ** - - Before July 1 8/26 11/1 Mississippi Kite *** - - 8/8 8/28 9/12 Black Skimmer ** - Before July 1 8/6 9/4 9/18 Least Tern *** - Before July 1 7/21 9/5 9/21 Gull-billed Tern * - Before July 1 7/23 9/7 9/29 Barn Swallow *** - Before July 1 8/8 9/8 11/5 Black-headed Grosbeak * - - 8/18 9/8 9/23 Sandwich Tern * Before July 1 7/28 8/19 9/8 12/9 Upland Sandpiper ** 7/21 8/3 8/20 9/8 9/23 Wilson's Plover * Before July 1 7/27 8/15 9/8 9/26 Semipalmated Plover ** 7/14 7/30 8/21 9/10 10/2 Louisiana Waterthrush * - - Before July 1 9/11 9/29 Orchard Oriole ** - - 8/13 9/12 9/30 Spotted Sandpiper *** Before July 1 7/19 8/17 9/12 10/3 Wilson's Phalarope * 7/19 8/2 8/22 9/12 10/3 Black Tern *** 7/20 8/8 8/24 9/13 9/27 Solitary Sandpiper ** - Before July 1 8/17 9/13 10/5 Cerulean Warbler * 8/1 8/13 8/28 9/14 9/26 Short-billed Dowitcher * Before July 1 7/3 8/27 9/14 9/25 Stilt Sandpiper * 7/5 7/21 8/15 9/14 11/21 Bank Swallow ** 8/6 8/17 9/1 9/16 9/28 Black-necked Stilt * 7/14 7/27 8/11 9/16 11/28 Gray Kingbird * - - 8/14 9/16 10/11 Semipalmated Sandpiper ** Before July 1 7/15 8/23 9/16 10/15 Buff-breasted Sandpiper * 7/31 8/14 8/30 9/17 9/30 Bullock's Oriole * 8/13 8/21 9/2 9/18 9/30

Great Plains

Moderate to heavy flights that will begin the weekend in favorable conditions will quickly dissipate by Sunday as unfavorable southerly flow returns. Other than localized pockets of marginal or favorable conditions that will host moderate flights, most of the region will see primarily light movements through Thursday as southerly flow persists. A burst of cooler air and northerly flow is forecast for the end of the period, suggesting a pulse of moderate to heavy flights are likely; however, the extent of these conditions will not be region wide, and migration may be similarly localized.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Ring-billed Gull *** 7/16 10/23 11/10 11/29 - Wilson's Snipe * 8/7 10/3 10/18 11/4 11/16 Pine Siskin * 8/23 10/11 12/28 - - Northern Flicker ****! 8/30 9/13 10/7 10/26 11/5 Pied-billed Grebe *** 8/30 9/12 10/31 11/20 12/6 Palm Warbler ** 8/31 9/11 9/27 10/13 10/25 Purple Finch * 8/31 12/9 After Dec 31 - - Sharp-shinned Hawk *** 8/31 9/25 10/10 - - Common Yellowthroat NA 9/1 9/15 9/25 10/9 10/14 Franklin's Gull *** 9/1 9/16 10/13 11/10 11/25 Indigo Bunting ** 9/1 9/15 10/1 10/10 10/21 Western Grebe * 9/2 10/18 10/31 11/19 12/3 Orange-crowned Warbler ****! 9/3 9/17 10/3 10/21 11/2 Ruby-crowned Kinglet *** 9/6 9/21 10/10 10/27 11/10 Scissor-tailed Flycatcher *** 9/6 9/16 9/28 10/19 11/2 Yellow-bellied Sapsucker * 9/7 12/7 After Dec 31 - - Double-crested Cormorant *** 9/8 9/25 10/22 11/24 12/17 Lincoln's Sparrow *** 9/8 9/23 10/10 10/28 11/10 Red-tailed Hawk *** 9/8 9/28 10/29 11/14 11/25 Marsh Wren ** 9/9 9/22 10/9 10/26 11/9 Red-winged Blackbird *** 9/9 9/22 10/24 11/13 11/27 Vesper Sparrow *** 9/9 9/23 10/8 10/26 11/8 Spotted Towhee *** 9/10 9/22 10/8 10/28 11/10 American Coot *** 9/11 10/3 10/29 11/21 12/10 Western Meadowlark *** 9/11 9/21 10/8 11/3 11/19 Common Grackle *** 9/12 9/23 10/8 10/31 11/16 Yellow-rumped Warbler ****! 9/12 9/25 10/13 10/29 11/10 White-throated Sparrow *** 9/13 9/28 10/18 11/3 11/16 Savannah Sparrow *** 9/14 9/27 10/13 10/30 11/12 Hermit Thrush ** 9/15 9/28 10/15 10/30 - Sprague's Pipit * 9/15 9/27 10/11 10/28 11/8 Sedge Wren *** 9/16 9/26 10/10 10/26 11/6 White-crowned Sparrow *** 9/16 9/30 10/18 11/3 11/15 Winter Wren * 9/16 10/11 11/3 - - American Pipit *** 9/17 10/4 10/24 11/12 11/26 Eastern Meadowlark *** 9/17 10/1 10/19 11/5 11/17 Nelson's Sparrow ** 9/17 9/27 10/10 10/25 11/4 Field Sparrow *** 9/18 9/30 10/18 11/6 11/17 Harris's Sparrow *** 9/18 10/6 11/2 - - Swamp Sparrow *** 9/18 9/30 10/17 11/2 11/13

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Great Egret *** - 7/15 9/11 10/16 11/10 Peregrine Falcon * Before July 1 7/26 9/19 10/10 10/28 Black-bellied Plover * 7/20 7/30 9/29 11/15 11/28 Greater Yellowlegs * - 8/1 10/26 11/13 11/25 Caspian Tern * 7/1 8/15 9/11 9/30 10/13 Blue-winged Teal *** 8/2 8/18 9/18 10/25 11/13 Blackpoll Warbler * 8/15 8/27 9/11 9/27 10/8 Northern Parula ** 8/17 8/27 9/11 9/29 10/11 Philadelphia Vireo * 8/15 8/27 9/12 9/29 10/10 Western Tanager * 8/19 8/29 9/11 9/28 10/9 Brown Thrasher *** 8/19 8/30 9/11 9/30 10/12 Gray Catbird *** 8/18 8/30 9/11 10/1 10/14 Swainson's Thrush *** 8/18 8/30 9/13 9/29 10/10 Black-throated Green Warbler * 8/17 9/1 9/19 10/7 10/22 Blue-headed Vireo *** 8/19 9/1 9/18 10/5 10/18 Cooper's Hawk ** 8/8 9/2 9/25 10/20 11/10 American Golden-Plover * 8/6 9/3 9/27 10/23 11/19 Clay-colored Sparrow *** 8/20 9/3 9/24 10/16 10/31 Red-shouldered Hawk * 8/11 9/5 9/30 10/26 - Yellow-headed Blackbird * 8/15 9/5 9/15 9/30 10/12 Merlin * 8/16 9/6 10/26 - - Nashville Warbler *** 8/24 9/6 9/23 10/10 10/24 Sora * 8/18 9/6 9/29 10/22 11/5 Summer Tanager ** 8/28 9/6 9/18 10/5 10/17 Warbling Vireo *** 8/10 9/6 9/12 9/21 10/3 Broad-winged Hawk * 8/28 9/7 9/20 10/7 10/19 Osprey *** 8/25 9/7 9/24 10/11 11/12 Turkey Vulture *** 8/20 9/8 9/22 10/16 10/30 American White Pelican ** 8/22 9/9 10/16 11/18 12/9 Eastern Phoebe *** 8/27 9/9 9/23 10/14 10/29 Palm Warbler * 8/31 9/11 9/27 10/13 10/25 Pied-billed Grebe *** 8/30 9/12 10/31 11/20 12/6 Northern Flicker *** 8/30 9/13 10/7 10/26 11/5 Common Yellowthroat *** 9/1 9/15 9/25 10/9 10/14 Indigo Bunting * 9/1 9/15 10/1 10/10 10/21 Canada Goose ** - 9/16 11/25 - - Franklin's Gull *** 9/1 9/16 10/13 11/10 11/25 Scissor-tailed Flycatcher ** 9/6 9/16 9/28 10/19 11/2 Orange-crowned Warbler *** 9/3 9/17 10/3 10/21 11/2

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Snowy Plover * - - Before July 1 9/12 10/3 Western Wood-Pewee * - Before July 1 7/20 9/17 9/29 Killdeer *** Before July 1 7/4 8/2 11/3 11/28 Cattle Egret * - - 8/5 9/30 11/3 Black-necked Stilt * - - 8/7 9/17 10/4 Spotted Sandpiper *** Before July 1 7/6 8/7 9/12 10/1 Chimney Swift *** - 7/25 8/10 10/10 10/25 Green Heron ** Before July 1 7/2 8/11 9/18 10/10 Bank Swallow ** Before July 1 7/5 8/12 9/13 9/29 Baird's Sandpiper ** ]+D11 7/10 8/13 9/11 10/3 Semipalmated Sandpiper ** 7/1 7/15 8/15 9/14 10/3 Solitary Sandpiper *** Before July 1 7/6 8/16 9/12 9/28 Black Tern *** Before July 1 7/5 8/17 9/14 10/2 Lark Bunting ** - - 8/17 9/13 9/30 Snowy Egret ** Before July 1 7/5 8/18 10/2 10/24 Semipalmated Plover * 7/1 7/21 8/19 9/17 10/11 Wood Duck ** Before July 1 7/1 8/19 10/27 11/19 Bell's Vireo *** 8/5 8/11 8/20 9/11 9/24 Forster's Tern ** Before July 1 7/26 8/20 9/15 10/26 Buff-breasted Sandpiper * 7/23 8/3 8/21 9/12 9/29 Lesser Yellowlegs ** - Before July 1 8/21 9/18 11/15 Wilson's Phalarope ** - Before July 1 8/21 9/15 10/2 Eastern Wood-Pewee *** Before July 1 8/5 8/22 9/19 10/6 Little Blue Heron ** - 7/10 8/24 9/16 10/2 Great Crested Flycatcher *** 8/11 8/17 8/25 9/15 9/27 Baltimore Oriole *** 8/6 8/14 8/26 9/12 9/23 Least Sandpiper *** - 7/10 8/26 9/16 9/30 Stilt Sandpiper ** Before July 1 7/8 8/26 9/15 9/30 Yellow Warbler *** 8/1 8/12 8/26 9/17 10/1 Blue-gray Gnatcatcher *** 8/2 8/15 8/27 9/21 10/5 Red-headed Woodpecker *** 7/31 8/13 8/27 9/23 10/13 Common Nighthawk *** - - 8/28 9/22 10/8 Ruby-throated Hummingbird *** Before July 1 7/29 8/28 9/21 10/8 Blackburnian Warbler * 8/3 8/15 8/30 9/15 9/27 Canada Warbler * 8/6 8/17 8/30 9/14 9/24 Northern Waterthrush ** 8/7 8/17 8/31 9/15 9/25 Red-eyed Vireo *** 8/11 8/19 8/31 9/19 10/2 Chipping Sparrow *** - - 9/1 10/31 11/14 Common Tern * - - 9/1 10/7 11/1 Mourning Dove *** - - 9/1 10/6 10/26 Yellow-bellied Flycatcher * 8/6 8/17 9/1 9/17 9/28 Olive-sided Flycatcher *** 8/9 8/19 9/2 9/18 9/29 Yellow-throated Vireo ** 8/11 8/20 9/2 9/20 10/2 American Redstart *** 8/10 8/20 9/3 9/20 10/2 Least Flycatcher *** 8/8 8/19 9/3 9/20 10/3 Mourning Warbler * 8/10 8/20 9/3 9/18 9/29 Black-and-white Warbler *** 8/10 8/20 9/4 9/20 10/3 Ovenbird ** 8/10 8/20 9/4 9/20 10/2 Rose-breasted Grosbeak ** 8/12 8/22 9/4 9/25 10/10 White-faced Ibis * Before July 1 8/14 9/4 10/1 10/27 Yellow-breasted Chat * 8/20 8/26 9/4 9/24 10/8 Black-crowned Night-Heron * - - 9/5 9/26 10/12 Chestnut-sided Warbler * 8/11 8/21 9/5 9/20 10/2 Say's Phoebe ** 8/12 8/25 9/7 9/28 10/11 Swainson's Hawk *** 7/28 8/21 9/7 10/4 10/21 Magnolia Warbler * 8/13 8/24 9/9 9/25 10/7 Red-necked Phalarope * 7/1 8/25 9/9 9/30 10/14 House Wren *** 8/25 9/1 9/10 10/3 10/19 Sanderling * 7/1 7/28 9/10 10/3 10/21 Tennessee Warbler ** 8/7 8/22 9/10 9/30 10/16 White-eyed Vireo ** 8/19 8/28 9/10 9/29 10/11 Blackpoll Warbler * 8/15 8/27 9/11 9/27 10/8 Brown Thrasher *** 8/19 8/30 9/11 9/30 10/12 Caspian Tern * 7/1 8/15 9/11 9/30 10/13 Gray Catbird *** 8/18 8/30 9/11 10/1 10/14 Great Egret *** - 7/15 9/11 10/16 11/10 Northern Parula ** 8/17 8/27 9/11 9/29 10/11 Western Tanager * 8/19 8/29 9/11 9/28 10/9 Philadelphia Vireo * 8/15 8/27 9/12 9/29 10/10 Warbling Vireo *** 8/10 9/6 9/12 9/21 10/3 Swainson's Thrush *** 8/18 8/30 9/13 9/29 10/10 Yellow-headed Blackbird *** 8/15 9/5 9/15 9/30 10/12 Blue-headed Vireo ** 8/19 9/1 9/18 10/5 10/18 Blue-winged Teal *** 8/2 8/18 9/18 10/25 11/13 Summer Tanager *** 8/28 9/6 9/18 10/5 10/17

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Northern Rough-winged Swallow ** - - Before July 1 7/15 10/19 Western Kingbird *** - Before July 1 7/17 8/11 9/16 Piping Plover * - - 7/26 8/12 9/24 Least Tern * - - 7/26 8/20 9/13 Yellow-billed Cuckoo *** - - Before July 1 8/22 10/4 Least Bittern * - - Before July 1 8/25 9/30 Pectoral Sandpiper ** Before July 1 7/20 8/10 8/26 10/20 Yellow-crowned Night-Heron * - Before July 1 7/31 8/26 10/5 Blue Grosbeak *** 7/27 8/1 8/9 8/27 9/11 Prothonotary Warbler * - - Before July 1 8/30 9/24 Cliff Swallow *** - - Before July 1 9/2 9/25 Short-billed Dowitcher * Before July 1 7/6 8/7 9/2 10/4 Tree Swallow ** - - Before July 1 9/4 11/8 Eastern Kingbird *** Before July 1 7/25 8/7 9/6 9/22 Marbled Godwit * - - Before July 1 9/8 10/2 Willet * - - Before July 1 9/8 10/5 Alder Flycatcher * 7/26 8/7 8/23 9/9 9/21 Lark Sparrow *** - - Before July 1 9/10 9/28 Mississippi Kite *** Before July 1 8/1 8/18 9/10 9/23 Baird's Sandpiper ** ]+D11 7/10 8/13 9/11 10/3 Bell's Vireo *** 8/5 8/11 8/20 9/11 9/24 Baltimore Oriole *** 8/6 8/14 8/26 9/12 9/23 Buff-breasted Sandpiper * 7/23 8/3 8/21 9/12 9/29 Snowy Plover * - - Before July 1 9/12 10/3 Solitary Sandpiper *** Before July 1 7/6 8/16 9/12 9/28 Spotted Sandpiper *** Before July 1 7/6 8/7 9/12 10/1 Bank Swallow *** Before July 1 7/5 8/12 9/13 9/29 Lark Bunting ** - - 8/17 9/13 9/30 Black Tern *** Before July 1 7/5 8/17 9/14 10/2 Canada Warbler ** 8/6 8/17 8/30 9/14 9/24 Semipalmated Sandpiper *** 7/1 7/15 8/15 9/14 10/3 Blackburnian Warbler * 8/3 8/15 8/30 9/15 9/27 Forster's Tern ** Before July 1 7/26 8/20 9/15 10/26 Great Crested Flycatcher *** 8/11 8/17 8/25 9/15 9/27 Northern Waterthrush ** 8/7 8/17 8/31 9/15 9/25 Stilt Sandpiper ** Before July 1 7/8 8/26 9/15 9/30 Wilson's Phalarope *** - Before July 1 8/21 9/15 10/2 Least Sandpiper *** - 7/10 8/26 9/16 9/30 Little Blue Heron ** - 7/10 8/24 9/16 10/2 Black-necked Stilt * - - 8/7 9/17 10/4 Semipalmated Plover ** 7/1 7/21 8/19 9/17 10/11 Western Wood-Pewee * - Before July 1 7/20 9/17 9/29 Yellow Warbler *** 8/1 8/12 8/26 9/17 10/1 Yellow-bellied Flycatcher * 8/6 8/17 9/1 9/17 9/28 Green Heron *** Before July 1 7/2 8/11 9/18 10/10 Lesser Yellowlegs ** - Before July 1 8/21 9/18 11/15 Mourning Warbler * 8/10 8/20 9/3 9/18 9/29 Olive-sided Flycatcher *** 8/9 8/19 9/2 9/18 9/29

West

A patchwork of favorable conditions in the northern portions of the region begin the period, and light to moderate flights will be scattered across the northern half of the West through Sunday night. A disturbance then makes its way through the Pacific Northwest, and generally unfavorable conditions persist across the region with its arrival. Some areas of the northern Rockies will experience continued light to moderate flights, but most of the West will experience much reduced migrant activity aloft. The end of the week sees a slow build of marginal and favorable conditions for movements in the Desert Southwest and California, and for the last part of the period these areas will experience light to locally moderate flights.

Species on the Move

Beginning Arrivals What is this?

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Ring-billed Gull ** Before July 1 11/2 11/22 12/5 - Pied-billed Grebe ** 7/27 10/18 11/11 11/29 - Northern Harrier ** 8/12 10/29 11/20 - - Red-tailed Hawk *** 8/18 9/12 After Dec 31 - - Marsh Wren ** 8/19 9/27 10/30 11/21 - Red-winged Blackbird *** 8/24 9/11 10/10 10/31 11/21 Red-necked Grebe * 8/26 10/20 11/6 11/22 - Prothonotary Warbler * 8/28 9/18 10/4 10/21 11/1 Merlin * 8/29 9/13 12/22 - - American Pipit *** 8/30 9/14 11/7 - - Eared Grebe *** 8/30 9/29 11/9 11/29 12/11 Lincoln's Sparrow *** 8/30 9/13 10/5 10/22 11/8 Say's Phoebe *** 8/30 9/13 10/1 - - Flesh-footed Shearwater * 8/31 9/16 10/2 10/21 11/4 Broad-winged Hawk * 9/2 9/12 9/27 10/13 10/24 Yellow-rumped Warbler *** 9/2 9/26 10/17 10/29 11/8 American Wigeon *** 9/3 10/19 11/20 12/4 12/16 White-crowned Sparrow ****! 9/4 9/20 10/14 10/26 11/6 American Coot *** 9/5 10/13 11/17 12/5 - American Robin * 9/6 12/2 12/23 - - Mountain Bluebird * 9/6 9/12 9/22 10/15 10/29 Northern Flicker *** 9/6 9/27 10/20 11/5 11/20 Yellow-green Vireo * 9/7 9/19 10/5 10/22 11/2 Greater White-fronted Goose ** 9/8 9/21 10/8 - - Red-naped Sapsucker * 9/8 9/22 10/9 10/24 11/4 Fox Sparrow *** 9/9 9/24 10/19 - - Western Meadowlark *** 9/10 9/27 10/22 11/8 12/6 Golden-crowned Sparrow *** 9/12 9/27 10/21 10/30 11/7 Sandhill Crane * 9/12 9/24 11/18 12/3 12/12 Sharp-tailed Sandpiper * 9/12 9/24 10/8 10/24 11/4 Palm Warbler * 9/13 9/27 10/18 11/5 11/29 Varied Thrush ** 9/14 9/29 After Dec 31 - - Golden-crowned Kinglet ** 9/14 10/3 10/26 11/11 11/21 Magnolia Warbler * 9/15 9/26 10/10 10/26 11/6 Ruby-crowned Kinglet ****! 9/15 10/3 12/16 - - Western Grebe *** 9/15 10/14 11/5 11/24 12/9 Chestnut-collared Longspur * 9/17 10/3 10/25 11/12 11/30 White-throated Sparrow ** 9/17 10/3 10/25 - - Black-throated Blue Warbler * 9/18 9/28 10/12 10/26 11/6 Cackling Goose ** 9/18 10/5 11/22 12/7 12/19 Harris's Sparrow * 9/18 10/14 After Dec 31 - -

Peaking Arrivals

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Heermann's Gull * - Before July 1 9/16 10/7 12/1 California Gull * Before July 1 7/14 11/9 11/26 12/10 Sanderling * Before July 1 7/18 9/11 - - Black Turnstone * 7/3 7/19 9/14 11/26 12/7 Black-footed Albatross * Before July 1 7/21 9/12 10/11 11/5 Elegant Tern * Before July 1 7/21 9/15 10/5 11/26 Black-bellied Plover * Before July 1 7/23 10/8 - - Black-throated Gray Warbler * 7/30 8/13 9/30 10/22 11/4 Pink-footed Shearwater * Before July 1 8/15 9/15 10/19 11/12 Ashy Storm-Petrel * Before July 1 8/18 9/11 10/8 10/26 Green-winged Teal ** 8/7 8/20 11/21 - - Northern Shoveler *** 8/5 8/20 11/22 - - Blue-winged Teal * 8/6 8/21 9/28 10/24 11/8 Buller's Shearwater * 7/28 8/21 9/21 10/22 11/15 Northern Pintail ** 8/9 8/22 11/19 - - Sora * 8/3 8/23 9/22 - - Blue-gray Gnatcatcher * 8/9 8/24 9/12 9/30 10/13 Black-and-white Warbler * 8/10 8/27 10/5 10/31 11/17 Clay-colored Sparrow * 8/14 8/28 9/17 10/6 11/2 Pacific-slope Flycatcher ** 8/19 8/28 9/12 10/4 10/20 Sooty Shearwater * Before July 1 8/28 9/12 10/2 10/16 Common Yellowthroat *** 8/17 8/29 9/16 10/9 10/28 Long-tailed Jaeger * 7/19 8/29 9/12 10/1 10/13 Savannah Sparrow *** 8/13 8/29 9/27 10/21 11/9 Pomarine Jaeger * 7/20 8/30 9/25 10/22 11/14 Townsend's Warbler *** 8/12 8/30 9/30 10/27 11/10 Vesper Sparrow ** 8/17 8/30 9/15 10/3 10/17 Common Tern * 8/19 9/1 9/16 10/3 10/16 Green-tailed Towhee * 8/21 9/1 9/14 10/1 10/12 Pectoral Sandpiper ** 8/17 9/1 9/20 10/11 10/28 Orange-crowned Warbler *** 8/12 9/2 9/22 10/12 10/29 Prairie Warbler * 8/21 9/3 9/19 10/5 10/17 Turkey Vulture *** 8/23 9/3 9/14 10/6 10/19 Parasitic Jaeger * 8/21 9/4 9/20 10/8 10/22 Sabine's Gull * 8/15 9/4 9/21 10/6 10/17 Tennessee Warbler * 8/22 9/4 9/21 10/8 10/22 Belted Kingfisher ** 8/15 9/5 10/27 11/10 - Red-throated Loon * 8/25 9/5 9/20 9/28 10/2 Vaux's Swift * 8/26 9/5 9/16 10/7 10/21 Black Phoebe ** 8/20 9/6 10/30 - - Red-shouldered Hawk ** 8/19 9/6 10/3 10/23 - Bobolink * 8/25 9/6 9/22 10/8 10/21 Chestnut-sided Warbler * 8/26 9/7 9/24 10/9 10/24 Cooper's Hawk ** 8/1 9/7 10/1 11/2 11/19 Blackburnian Warbler * 8/25 9/8 9/28 10/17 11/7 Blackpoll Warbler * 8/28 9/8 9/24 10/9 10/22 Brewer's Blackbird ** 8/23 9/8 9/28 10/16 11/10 Sharp-shinned Hawk * 8/23 9/9 10/22 11/8 - South Polar Skua * 7/26 9/10 9/25 10/15 10/30 Red-winged Blackbird ** 8/24 9/11 10/10 10/31 11/21 Red-tailed Hawk *** 8/18 9/12 After Dec 31 - - Broad-winged Hawk * 9/2 9/12 9/27 10/13 10/24 Mountain Bluebird * 9/6 9/12 9/22 10/15 10/29 Lincoln's Sparrow *** 8/30 9/13 10/5 10/22 11/8 Merlin * 8/29 9/13 12/22 - - Say's Phoebe *** 8/30 9/13 10/1 - - American Pipit ** 8/30 9/14 11/7 - - Flesh-footed Shearwater * 8/31 9/16 10/2 10/21 11/4 Prothonotary Warbler * 8/28 9/18 10/4 10/21 11/1

Beginning Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Olive-sided Flycatcher * - - Before July 1 9/19 10/3 Plumbeous Vireo * - - 7/15 9/22 10/6 Summer Tanager * - - 7/27 10/3 10/15 Bell's Vireo * - Before July 1 7/28 9/26 10/12 Blue Grosbeak ** Before July 1 7/1 7/31 9/16 10/12 Whimbrel * Before July 1 7/10 8/5 10/3 - Western Wood-Pewee *** - - 8/7 9/26 10/12 Black-chinned Hummingbird *** Before July 1 7/16 8/9 9/13 10/4 Zone-tailed Hawk * Before July 1 7/17 8/9 9/23 10/11 Wilson's Phalarope ** Before July 1 7/13 8/11 9/11 10/3 Swainson's Hawk ** - 7/26 8/14 9/27 10/13 Black Tern * Before July 1 7/24 8/15 9/24 10/8 Mourning Dove *** - Before July 1 8/17 9/22 10/8 Bank Swallow * - Before July 1 8/18 9/12 9/28 Lark Sparrow ** 7/21 8/1 8/19 9/19 10/5 Lazuli Bunting ** 8/5 8/11 8/20 9/17 10/10 Spotted Sandpiper *** Before July 1 7/3 8/21 9/19 10/4 Black-necked Stilt ** Before July 1 7/1 8/22 9/18 10/7 Barn Swallow *** - Before July 1 8/23 9/25 10/12 Fork-tailed Storm-Petrel * 7/16 7/30 8/23 10/7 10/23 Wandering Tattler * Before July 1 7/20 8/24 9/24 10/16 Lesser Yellowlegs ** Before July 1 8/9 8/26 9/14 10/20 Osprey ** 8/4 8/14 8/26 9/16 10/18 Semipalmated Plover ** Before July 1 7/13 8/26 9/14 9/28 Solitary Sandpiper ** 7/25 8/11 8/26 9/14 9/27 White-faced Ibis ** Before July 1 7/4 8/26 9/25 10/16 Virginia's Warbler * 8/3 8/14 8/27 9/17 10/2 Least Sandpiper *** Before July 1 7/15 8/28 9/13 9/25 Short-billed Dowitcher * Before July 1 7/4 8/28 9/13 9/24 Baird's Sandpiper ** 7/30 8/13 8/29 9/15 9/29 Sage Thrasher * - - 8/29 9/24 10/20 Western Sandpiper *** Before July 1 7/8 8/29 9/15 10/6 Greater Yellowlegs ** Before July 1 7/10 8/30 9/14 12/11 Green Heron * - Before July 1 8/30 9/23 10/18 Red-eyed Vireo * 8/11 8/19 8/30 9/17 9/29 American Avocet * - Before July 1 8/31 9/28 10/20 Gray Catbird ** 8/10 8/19 8/31 9/19 10/2 Red-headed Woodpecker * 8/8 8/18 8/31 9/15 9/26 Stilt Sandpiper * Before July 1 7/17 8/31 9/15 9/27 Tufted Puffin * - - 8/31 9/24 10/11 American White Pelican * Before July 1 8/17 9/1 9/26 12/11 Red-necked Phalarope *** 8/2 8/16 9/1 9/19 10/5 Buff-breasted Sandpiper * 8/9 8/19 9/2 9/16 9/26 Red-breasted Nuthatch * 7/29 8/10 9/2 10/28 11/14 Yellow-headed Blackbird ** 8/12 8/21 9/2 9/24 10/11 Franklin's Gull * Before July 1 7/1 9/3 10/3 11/1 Willow Flycatcher *** 8/9 8/20 9/3 9/23 10/7 MacGillivray's Warbler *** 8/8 8/19 9/4 9/23 10/7 Nashville Warbler ** 8/2 8/16 9/4 9/23 10/12 Northern Waterthrush * 8/9 8/20 9/4 9/19 10/3 Cinnamon Teal * 7/31 8/16 9/5 9/28 10/14 Arctic Tern * 7/18 8/8 9/5 9/30 10/17 Brown Thrasher * 8/12 8/21 9/5 9/21 10/6 Gray Flycatcher * 8/9 8/22 9/5 9/25 10/7 Black Storm-Petrel * Before July 1 8/21 9/6 10/21 11/1 Cassin's Vireo * 8/11 8/22 9/6 9/25 10/8 Hammond's Flycatcher * 8/13 8/22 9/6 9/24 10/7 Least Flycatcher * 8/11 8/21 9/6 9/24 10/8 Western Tanager *** 8/15 8/25 9/7 9/28 10/12 Brewer's Sparrow ** 8/6 8/21 9/8 9/28 10/11 Chipping Sparrow ** 8/7 8/20 9/8 10/11 11/5 Killdeer ** 8/4 8/19 9/8 9/30 11/20 Swainson's Thrush ** 8/19 8/26 9/8 9/24 10/10 Wilson's Warbler *** 8/8 8/22 9/8 9/28 10/12 Yellow Warbler *** 8/5 8/19 9/8 10/3 10/21 House Wren ** 8/14 8/24 9/9 9/29 11/8 Warbling Vireo *** 8/14 8/25 9/9 9/29 10/13 American Redstart * 8/11 8/23 9/10 9/27 10/11 Ruff * 7/27 8/26 9/10 9/27 10/9 Ashy Storm-Petrel * Before July 1 8/18 9/11 10/8 10/26 Black-footed Albatross * Before July 1 7/21 9/12 10/11 11/5 Blue-gray Gnatcatcher * 8/9 8/24 9/12 9/30 10/13 Long-tailed Jaeger * 7/19 8/29 9/12 10/1 10/13 Pacific-slope Flycatcher *** 8/19 8/28 9/12 10/4 10/20 Sooty Shearwater * Before July 1 8/28 9/12 10/2 10/16 Black Turnstone * 7/3 7/19 9/14 11/26 12/7 Green-tailed Towhee ** 8/21 9/1 9/14 10/1 10/12 Turkey Vulture *** 8/23 9/3 9/14 10/6 10/19 Elegant Tern * Before July 1 7/21 9/15 10/5 11/26 Pink-footed Shearwater * Before July 1 8/15 9/15 10/19 11/12 Vesper Sparrow ** 8/17 8/30 9/15 10/3 10/17 Heermann's Gull * - Before July 1 9/16 10/7 12/1 Common Tern * 8/19 9/1 9/16 10/3 10/16 Common Yellowthroat *** 8/17 8/29 9/16 10/9 10/28 Vaux's Swift ** 8/26 9/5 9/16 10/7 10/21 Clay-colored Sparrow * 8/14 8/28 9/17 10/6 11/2

Ending Departures

Species Noticeability Migrants Begin Arriving Rapid Migrant Influx Peak Rapid Migrant Departure Last Migrants Depart Black Swift * - - Before July 1 7/3 9/25 Bullock's Oriole ** - - Before July 1 7/20 9/15 Tree Swallow *** - - Before July 1 7/25 9/13 Violet-green Swallow ** - - Before July 1 7/26 10/15 Lucy's Warbler * - - Before July 1 7/27 10/16 Yellow-breasted Chat * - - Before July 1 7/28 9/29 Gull-billed Tern * - - Before July 1 8/1 9/13 Cliff Swallow *** - - Before July 1 8/9 9/14 Indigo Bunting * - Before July 1 7/21 8/11 10/2 Hooded Oriole ** - Before July 1 7/22 8/21 9/20 Black Skimmer * - Before July 1 7/12 8/23 9/16 Lesser Nighthawk * - Before July 1 7/23 8/26 9/14 White-winged Dove *** - Before July 1 7/29 8/27 9/19 Pigeon Guillemot * Before July 1 7/19 8/4 8/27 9/13 Yellow-billed Cuckoo * - Before July 1 7/28 8/28 9/19 Common Nighthawk ** - - 8/4 9/1 9/22 Black-headed Grosbeak *** - - Before July 1 9/2 9/30 Eastern Kingbird ** 7/24 8/1 8/11 9/2 9/16 Grace's Warbler * Before July 1 7/22 8/4 9/2 9/20 Broad-tailed Hummingbird *** - Before July 1 7/28 9/3 9/26 Calliope Hummingbird * - Before July 1 7/27 9/3 9/23 * - - - 9/4 9/29 Caspian Tern *** - Before July 1 7/31 9/6 9/24 Mississippi Kite * - Before July 1 8/4 9/6 10/1 Hermit Warbler * 7/28 8/6 8/22 9/7 10/26 Purple Martin * - Before July 1 8/3 9/7 9/22 Ruddy Turnstone * Before July 1 7/13 8/21 9/8 12/5 Rufous Hummingbird *** Before July 1 7/1 8/1 9/8 9/25 Lark Bunting * 7/25 8/4 8/21 9/9 9/26 Semipalmated Sandpiper * Before July 1 7/31 8/19 9/9 9/22 Snowy Plover * Before July 1 7/4 8/10 9/9 10/4 Northern Rough-winged Swallow ** - - Before July 1 9/10 9/27 Western Kingbird *** - - 7/13 9/10 9/26 Wilson's Phalarope ** Before July 1 7/13 8/11 9/11 10/3 Bank Swallow ** - Before July 1 8/18 9/12 9/28 Black-chinned Hummingbird *** Before July 1 7/16 8/9 9/13 10/4 Least Sandpiper *** Before July 1 7/15 8/28 9/13 9/25 Short-billed Dowitcher ** Before July 1 7/4 8/28 9/13 9/24 Greater Yellowlegs * Before July 1 7/10 8/30 9/14 12/11 Lesser Yellowlegs * Before July 1 8/9 8/26 9/14 10/20 Semipalmated Plover *** Before July 1 7/13 8/26 9/14 9/28 Solitary Sandpiper ** 7/25 8/11 8/26 9/14 9/27 Baird's Sandpiper ** 7/30 8/13 8/29 9/15 9/29 Red-headed Woodpecker * 8/8 8/18 8/31 9/15 9/26 Stilt Sandpiper * Before July 1 7/17 8/31 9/15 9/27 Western Sandpiper *** Before July 1 7/8 8/29 9/15 10/6 Blue Grosbeak ** Before July 1 7/1 7/31 9/16 10/12 Buff-breasted Sandpiper * 8/9 8/19 9/2 9/16 9/26 Osprey ** 8/4 8/14 8/26 9/16 10/18 Lazuli Bunting ** 8/5 8/11 8/20 9/17 10/10 Red-eyed Vireo * 8/11 8/19 8/30 9/17 9/29 Virginia's Warbler * 8/3 8/14 8/27 9/17 10/2 Black-necked Stilt ** Before July 1 7/1 8/22 9/18 10/7

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