It looks like our first Fall frost/freeze will take place Tuesday night as skies clear from any cloud cover and the gusty winds we've experienced the last few days subside.
A FREEZE WARNING has been issued for our northwest Illinois counites of Stephenson, Jo Daviess, Carroll, and Whiteside. A FREEZE WATCH is currently in place for Green and Rock counties in southern Wisconsin, and for Winnebago, Boone, Ogle, Lee, McHenry, and DeKalb counties. For both, these will go into effect Tuesday night, lasting through Wednesday morning.
Temperatures Monday night will likely dip into the upper 30s for most, but a gusty northwest wind and cloud cover will limit the overall potential for any widespread frost. It's possible there will be some patchy frost, especially where skies clear through the night, but widespread frost is not expected.
Tuesday will start mostly cloudy as northeast winds help pull cloud cover in off of Lake Michigan. A few spotty showers may also be possible east of Rockford. As high pressure settles in closer to the Mississippi River Tuesday evening skies will continue to clear, leaving mostly clear skies Tuesday night. Gusty winds from earlier in the day will ease as lighter winds remain in place Tuesday night. This will allow temperatures to fall quickly once the sun sets, dropping into the upper 20s and low 30s. The clear skies and light winds will allow for widespread frost to develop through Wednesday morning. Wednesday night will hold another chance for frost and freezing temperatures before temperatures climb back above average by the end of the week.
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