Just wait, and the weather will change over the metro area today. A cold
front will move through northeast Illinois preceded by showers and
thunderstorms. Strong storms with localized heavy downpours will pass to the
north this morning, and then a more organized band of showers and
thunderstorms should develop along the frontal boundary as it moves south
through the area this afternoon. Behind the front, winds shift to the
northeast bringing much cooler air off the 50-degree surface of Lake
Michigan. Further to the south ahead of the front, strong, possibly severe
storms will develop in moisture-laden 80-degree air.
More rain Tuesday
The cold front will become stationary south of Interstate 80 Tuesday with
resultant showers and thunderstorms likely to produce additional heavy rains
and possible flooding over northern Illinois. A slight shift in the jet
stream should move this weather system well to the south Wednesday, allowing
a drying-out period the rest of the workweek. Showers and thunderstorms may
return to the Midwest this weekend.
Frost and freeze warnings in the Northeastern U.S. tonight
A very cool Canadian-source high pressure air mass will sit over the northeast tonight. With clearing skies and light winds, a late season frost/freeze is expected over a large portion of the northeastern U.S. as temperatures are forecast to drop into the lower 30s early Monday morning from Maine to northern Pennsylvania.
