The last round of heavy rain producing thunderstorms are now moving through DeKalb, Boone and McHenry counties. While these haven't produced any severe weather, rainfall totals over an inch and pea to nickel sized hail were reported earlier this afternoon.
Most of us will get a break from the rain as skies have been clearing to the west, and temperatures back in Iowa and western Illinois have been warming back into the 70's and low 80's. That warmer air will become the fuel needed for additional thunderstorms that have already started to develop along a cold front from Northern Wisconsin, Minnesota and Northwest Iowa. Northern Illinois and Southern Wisconsin will remain dry through about Midnight when the storms to the northwest are expected to drop into Northwest Illinois. Since they won't have the heating of the daytime, they will be in a weakening state, but heavy rain and small hail could be possible overnight into early Monday morning.
The front will become stationary and set up what looks like to be between I-88 and the Illinois/Wisconsin border. That area will then become the focus for additional thunderstorms late Monday afternoon into Monday night and Tuesday morning before lifting back north into Wisconsin by Wednesday morning. Severe weather isn't expected Monday afternoon, but stronger storms with wind and quarter sized hail could occur.
Another threat will be heavy rain. The Gulf will be wide open for moisture to stream north into the Great Lakes. While many of you received close to an inch of rain from what came through Sunday afternoon, an additional one to three inches of rainfall could fall from Monday through the end of the week.
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