Severe thunderstorms have developed over parts of Texas, Oklahoma and Arkansas Friday evening, all part of a large storm system that is expected to bring heavy snow over the Plains and Upper Midwest, more severe weather to the mid-Mississippi River Valley and heavy rainfall across northern Illinois.
Increasing moisture Friday night will lead to dense fog and a slight chance for light freezing rain or wintry mix across far northern Illinois and southern Wisconsin after Midnight. Temperatures will continue to warm through sunrise Saturday, changing any wintry weather over to mostly rain. However, there may still be a light mix across southern Wisconsin through mid-morning Saturday.
Rainfall is expected to increase in intensity mid to late morning Saturday with scattered showers lasting through the afternoon and evening. A warm front will lift to roughly the I-80 corridor Saturday with the potential for a few stronger thunderstorms to the south. North of the front (where we will be located) a chilly, wind-driven rain will occur. This dynamic storm system will continue pulling moisture out ahead of it with rainfall amounts adding up between half an inch and an inch by Sunday morning.
Low pressure will track closer to northwest Illinois Sunday morning before passing over north-central Illinois Sunday afternoon. This will allow colder air to wrap back in during the afternoon and evening Sunday. A wintry mix of rain and snow will be likely with a transition over to all light snow by Sunday evening. A quick inch of snow will be possible for some by Monday morning.
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