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Fox News Weather Center

Dramatic Blast of Chilly Air to Hit Midwest, Cool Down East

The chilliest air since last spring will blast into the northern Plains and Midwest late this week and will make areas from the Central states to the East and South feel like autumn for a couple of days.

The sweep of autumn air will follow a dose of drenching downpours and severe weather in some locations.

Temperatures will take a dramatic tumble over parts of the Midwest on Friday. When compared to midweek afternoon highs from this week, early morning temperatures by the weekend may be 30 to 50 degrees lower. With gusty winds factored in, AccuWeather RealFeel® Temperatures will plummet.

The AccuWeather RealFeel Temperature stands apart from other indices, such as the National Weather Service's Wind Chill Index, which generally rely on two factors - such as temperature and either wind speed or humidity. RealFeel Temperatures incorporate many factors in a complex equation to provide a precise measure of how the temperature feels outdoors in a specific location. Contributing factors include temperature, wind speed and humidity, as well as additional factors including precipitation, cloud cover and sun intensity. Only the patented technology of the RealFeel Temperature lets you know what it feels like to people.

Actual low temperatures will dip into the upper 30s around Chicago Friday night.

The combination of temperature, wind and other conditions will make AccuWeather RealFeel Temperatures dip into the teens and 20s over the northern Plains and Upper Midwest and the 20s and 30s farther south in the Midwest and the lower Great Lakes Friday night and Saturday night.

The action of chilly air passing over the warm waters of the Great Lakes will create some chaotic weather conditions.

The chill will be accompanied by gusty winds, rounds of angry-looking clouds and showers in some areas, especially around the Great Lakes.

Some wet snowflakes can mix in with the rain showers in the swath from Minnesota to Wisconsin and Michigan during Friday night and Saturday.

A few waterspouts could also be produced over the lower Great Lakes Friday and Saturday.

The chilly air will expand across the Central states Friday into Saturday and may be a factor for fans heading to high school and college football games in the region.

The much cooler and less humid air will be accompanied by gusty winds from portions of the central and southern Plains eastward to the Appalachians. The period from Saturday into Saturday night is likely to be quite blustery over the central Appalachians with plunging temperatures and RealFeel Temperatures.

While the cooler air will lose some of its punch upon nearing the Atlantic coast, autumn air will still be felt east of the Appalachians this weekend. High temperatures will be no higher than the 60s from Washington, D.C., to Philadelphia, New York City and Boston on Sunday. RealFeel Temperatures can dip into the 50s at times during the daylight hours along the Interstate-95 corridor in the Northeast.

Cooler and drier air will also settle southward into Florida this weekend, which has been rain-soaked during much of September.

High temperatures will be in the 60s both days of the weekend around Atlanta. A breeze, bright sunshine and a deep blue sky will add to the autumn feel during the daylight hours.

While the chill is projected to hang on around the Great Lakes into next week, temperatures will trend upward in the East and South.