01:14 Watch Fire Thunderstorm Develops, Collapse Over Wildfire The Creek Wildfire in Northern California produced what is called a fire thunderstorm. Meteorologist Ari Sarsalari explains

At a Glance Record lows and record-cold highs were set during an initial blast of chilly air across the East during the Labor Day weekend.

Another invasion of fall-like temperatures is on the way this week east of the Rockies.

Sept. 1 marked the beginning of meteorological fall, which runs until Nov. 30, and for parts of the East and South, this is coinciding with another round of cool temperatures in the week ahead.

A southward dip in the jet stream, or upper-level trough, was the common weather pattern during the summer in the East, while a northward bulge in the jet stream, or upper-level ridge, often set up in the West. This overall pattern will continue during the first full week of September as the trough sweeps almost as far south as the Gulf Coast.

Temperatures are typically below average underneath a trough as cooler air is drawn southward out of Canada, and a blast of true fall-like air will engulf the eastern and southern states at times during the upcoming work week.

<img class="styles__noscript__2rw2y" src="https://dsx.weather.com//util/image/w/0902_fall-like_setup.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0" srcset="https://dsx.weather.com//util/image/w/0902_fall-like_setup.jpg?v=at&w=485&h=273&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 400w, https://dsx.weather.com//util/image/w/0902_fall-like_setup.jpg?v=ap&w=980&h=551&api=7db9fe61-7414-47b5-9871-e17d87b8b6a0 800w" > Wednesday's Forecast Upper-Level Pattern Brighter colors indicate warmer temperatures and darker colors indicate cooler temperatures.

(MORE: All-Time Record-High Temperature Set in San Francisco; Record Heat Shifts to the Northwest This Week )

This Week: Another Shot of Cool Air

Temperatures started the week closer to average, but another cold front will now sweep through much of the East and South into Wednesday.

(MAPS: 10-Day Forecast High/Low Temperatures )

This next cool shot will drop temperatures generally 10 to 20 degrees below average mid- to late week across parts of the central and eastern U.S.

This means highs will be in the 60s and 70s across the Northeast, mid-Atlantic, Midwest and even much of the South by Wednesday and Thursday.

(MAPS: Average Monthly Temperatures )

Widespread lows in the 50s are expected as far south as the interior Southeast and mid-South region mid- to late week. From the upper Mississippi Valley and Great Lakes to the interior Northeast, many locations may fall into the 30s and 40s.

This may lead to a few record daily lows late this week (current record in parentheses):

On Thursday morning record lows are possible are in the following location : Kansas City (47 degrees); Nashville (49 degrees); Huntsville, Alabama (51 degrees); Charlotte, North Carolina (53 degrees) and Atlanta (56 degrees).

On Friday morning, record lows may occur in: Nashville (51 degrees); Tupelo, Mississippi (53 degrees); Birmingham, Alabama (54 degrees); Memphis (54 degrees); Charlotte, North Carolina (54 degrees); Atlanta (56 degrees); Montgomery, Alabama (57 degrees); San Antonio (59 degrees).

A few record cold high temperatures are also possible in parts of the Midwest, Ohio Valley and Great Lakes regions, including Indianapolis on Wednesday and Binghamton, New York on Thursday.

Labor Day Weekend Chill

Several record lows were set going into the Labor Day holiday weekend from an initial blast of chilly air.

Friday morning, record lows were set in Alpena, Michigan (36 degrees - tied); Watertown, New York (37 degrees - tied); Flint, Michigan (39 degrees); Binghamton, New York (42 degrees); Syracuse, New York (42 degrees - tied); Poughkeepsie, New York (43 degrees) and Bridgeport, Connecticut (52 degrees - tied).

Saturday morning, additional record lows were broken, including in Glens Falls, New York (34 degrees); Albany, New York (38 degrees); Binghamton, New York (39 degrees - tied); Syracuse, New York (40 degrees - tied); Poughkeepsie, New York (40 degrees); Hartford, Connecticut (41 degrees); Springfield, Illinois (42 degrees); Providence, Rhode Island (46 degrees); Newark, New Jersey (49 degrees) and New York City's LaGuardia Airport (56 degrees - tied).

A few record-cold high temperatures have also been observed. Friday, the following cities set new records for coolest high temperature for the date: Dayton, Ohio (59 degrees); Columbus, Ohio (62 degrees); Pittsburgh (63 degrees) and Watertown, New York (64 degrees).