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WPC Probabilistic Winter Precipitation Guidance Product Selection Precipitation Type Forecast Product Forecast Duration Snow

Freezing Rain Probability Forecasts

Accumulation by Percentile 24-Hour

48-Hour

72-Hour

User Interface ESRI Maps

GIF Images 24-Hour Snowfall Accumulation - 5th Percentile Day 1 Day 2 Day 3 Valid for the 24-hour

period ending: 00Z Mon

Sep 21 06Z Mon

Sep 21 12Z Mon

Sep 21 18Z Mon

Sep 21 00Z Tue

Sep 22 06Z Tue

Sep 22 12Z Tue

Sep 22 18Z Tue

Sep 22 00Z Wed

Sep 23 24-Hour Snowfall Accumulation - 10th Percentile Day 1 Day 2 Day 3 Valid for the 24-hour

period ending: 00Z Mon

Sep 21 06Z Mon

Sep 21 12Z Mon

Sep 21 18Z Mon

Sep 21 00Z Tue

Sep 22 06Z Tue

Sep 22 12Z Tue

Sep 22 18Z Tue

Sep 22 00Z Wed

Sep 23 24-Hour Snowfall Accumulation - 25th Percentile Day 1 Day 2 Day 3 Valid for the 24-hour

period ending: 00Z Mon

Sep 21 06Z Mon

Sep 21 12Z Mon

Sep 21 18Z Mon

Sep 21 00Z Tue

Sep 22 06Z Tue

Sep 22 12Z Tue

Sep 22 18Z Tue

Sep 22 00Z Wed

Sep 23 24-Hour Snowfall Accumulation - 50th Percentile Day 1 Day 2 Day 3 Valid for the 24-hour

period ending: 00Z Mon

Sep 21 06Z Mon

Sep 21 12Z Mon

Sep 21 18Z Mon

Sep 21 00Z Tue

Sep 22 06Z Tue

Sep 22 12Z Tue

Sep 22 18Z Tue

Sep 22 00Z Wed

Sep 23 24-Hour Snowfall Accumulation - 75th Percentile Day 1 Day 2 Day 3 Valid for the 24-hour

period ending: 00Z Mon

Sep 21 06Z Mon

Sep 21 12Z Mon

Sep 21 18Z Mon

Sep 21 00Z Tue

Sep 22 06Z Tue

Sep 22 12Z Tue

Sep 22 18Z Tue

Sep 22 00Z Wed

Sep 23 24-Hour Snowfall Accumulation - 90th Percentile Day 1 Day 2 Day 3 Valid for the 24-hour

period ending: 00Z Mon

Sep 21 06Z Mon

Sep 21 12Z Mon

Sep 21 18Z Mon

Sep 21 00Z Tue

Sep 22 06Z Tue

Sep 22 12Z Tue

Sep 22 18Z Tue

Sep 22 00Z Wed

Sep 23 24-Hour Snowfall Accumulation - 95th Percentile Day 1 Day 2 Day 3 Valid for the 24-hour

period ending: 00Z Mon

Sep 21 06Z Mon

Sep 21 12Z Mon

Sep 21 18Z Mon

Sep 21 00Z Tue

Sep 22 06Z Tue

Sep 22 12Z Tue

Sep 22 18Z Tue

Sep 22 00Z Wed

Sep 23 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 00Z September 20, 2020 - 00Z September 21, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 06Z September 20, 2020 - 06Z September 21, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 12Z September 20, 2020 - 12Z September 21, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 18Z September 20, 2020 - 18Z September 21, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 00Z September 21, 2020 - 00Z September 22, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 06Z September 21, 2020 - 06Z September 22, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 12Z September 21, 2020 - 12Z September 22, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 18Z September 21, 2020 - 18Z September 22, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th 24-Hour Snowfall Percentile Accumulation Forecasts

Valid 00Z September 22, 2020 - 00Z September 23, 2020 Threshold: 5th 10th 25th 50th 75th 90th 95th Viewing Options Choose a percentile for the specified time: 5th

10th

25th

50th

75th

90th

95th

OR Choose a 24-hour period for the specified percentile: 00Z Sep 21

06Z Sep 21

12Z Sep 21

18Z Sep 21

00Z Sep 22

06Z Sep 22

12Z Sep 22

18Z Sep 22

00Z Sep 23

Map Overlays State Boundaries MouseOver ON MouseOver OFF Opacity (%): 0 20 40 60 80 100 Information about these products Download GRIB2 Probability Guidance (Note: The GRIB2 download page contains 4 directories corresponding to the accumulation period of the forecast) Download latest KML files **Information about the KML files available for download (Click to show/hide)** Notes about the KML files in the download directory: You will notice both .kmz and .png files in the directory. The .png are images used to show the legend describing the forecast. The .kmz file contains both the .png and .kml file needed for display, so there is no need to download them separately.

The files are optimized for viewing in Google Earth. Files for display in Google Maps are available at http://www.wpc.ncep.noaa.gov/pwpf/latest_kml Notes about the KML files in the download directory: WPC Winter Weather Products Home Page NOAA/ National Weather Service

National Centers for Environmental Prediction

Weather Prediction Center

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College Park, Maryland 20740

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