A disturbance moving along an east/west stationary front to our south pulled moisture up and over the front into northern Illinois. Initially, it was warm enough that all of the precipitation was in the form of rain, but eventually it got cold enough to produce a wet snow across the northern counties of Illinois from the Mississippi River eastward to Lake Michigan. The grass was white by daybreak, and cars that were sitting outside overnight had about a half inch of slushy snow on the roofs and windshields. The disturbance has moved east, and the snow has come to an end, but skies remain cloudy. Temperatures will not go up much today with a damp breeze from the east at 10 to 15 mph under cloudy skies. Area high temperatures this afternoon will struggle into the middle 40's. That's about 15 degrees below the average high for today which is now at 60 degrees. The next major system to contribute to Stateline weather is about to put itself together over the central/southern plains. A surge of low level moisture will be drawn northward up an over a stationary front lying to our south, and rain will begin again tonight. It will be cold enough that some snow could mix in to the northwest of Rockford overnight. Tuesday will be a nasty, rainy, windy, raw, day with a chance of some embedded thunderstorms. The wind will make it feel extra chilly as is cuts in from the east to northeast at 15 to 20 mph with gusts up to 30 mph. High temperatures are expected to only be around 40 degrees on Tuesday. Rainfall could add up to around 1" on Tuesday.
By the Firstwarn Weather Team
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