Decatur, Illinois

I feel like the heart of Illinois is a good place to really see what synoptic scale weather patterns can do

AT 854PM, CT, Decatur was reporting a temperature of 36 degrees. Above freezing temperatures after fresh rain and snow have led to low clouds and fog beginning to develop in the region thanks to clear skies and calm winds. After what should be a foggy morning tomorrow, emerging low pressure in the High Plains will drive warm air northward throughout the day tomorrow.
Decatur is far enough south that the emerging low will bring a threat for rain or even an isolated rumble of thunder as the feature slides north towards the Upper Midwest and sends an active cold front into Illinois by sunrise. The system is going to be fast moving and will be through by the early afternoon, leaving a chilly but clear evening by Thursday.
Tomorrow – Partly cloudy, High 50, Low 32
Thursday – Rain early, at times heavy, High 54, Low 41

TWC: Tomorrow – Areas of patchy fog early. Sunshine and clouds mixed. High 51, Low 29
Thursday – Showers in the morning then continued cloudy and windy in the afternoon. High 59, Low 44

AW: Tomorrow – Sunny to partly cloudy and milder High 52, Low 32
Thursday – Breezy and mild in the morning; otherwise, cloudy with showers, mainly early in the day High 60, Low 45

NWS: Tomorrow – Widespread fog, mainly before 8am. Otherwise, partly sunny, High 53, Low 33
Thursday – Rain, mainly before noon High 61, Low 43

WB: Tomorrow – Partly sunny, Widespread fog in the morning, High 49, Low 31
Thursday – Rain in the morning, then a chance of rain in the afternoon, High 57, Low 41

WN: Tomorrow – Partly cloudy, High 53, Low 33
Thursday – Partly cloudy with light rain, High 61, Low 46

FIO: Tomorrow – Mostly cloudy throughout the day. High 49, Low 28
Thursday – Light rain and windy in the morning. High 61, Low 41

It’s going to be a pretty virulent system that moves through the country this week, but if there is any good news, it’s that it is moving through now, rather than later in the season, when more snow would fall, or in the spring, when severe storms are likely. Here, we can just see fog developing.

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