Much of Monday and Tuesday will end up dry, but scattered rain showers will slide into Northern Illinois Tuesday afternoon and evening. Highest coverage of rain will be centered West and South where better forcing and moisture will be present. Locally, rainfall chances may only peak around 30-40%, with some in Southern Wisconsin possibly remaining dry.
As the low pressure system bringing the showers pivots Southward, we will see drier air wrap in Wednesday afternoon. A few isolated showers may still remain early on, but most of the afternoon and evening appear to be dry. Winds will increase a bit as the low pressure develops overhead, with gusts nearing 30 mph from the Northeast on Wednesday.
A blocking high pressure across the Great Lakes will work to limit the rainfall around here, with the steadiest of the rain following the track of the surface low pressure to our West and South. There is a plausible scenario for some locations in the Stateline to remain totally dry. Most likely rainfall totals for Rockford may only approach a quarter inch at the most. South and West of Rockford toward Davenport, Iowa and Peoria, IL may receive closer to a half inch or more.
Temperatures throughout this time will remain fairly consistent, with afternoon highs in the mid-50s and overnight lows ranging from the mid-30s to the low 40s under more clouds. Halloween is trending drier with temperatures likely reaching the upper 40s by the time for late evening trick-or-treating.
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