(8:45PM - 3/26/19) A new storm system is expected to affect the region over the next several days, bringing the chance for heavy rain, t'storms and flooding to portions of the state.
Periods of rain and isolated t'storms will first be likely across Northern and Central Illinois from Wednesday evening through Thursday morning. After this time, periods of rain and t'storms will be likely across the entire state from Thursday afternoon into Saturday night. The combination of a stalled out frontal boundary across the state most of the period and high moisture content, will lead to the repeated rounds of rain and potentially heavy rainfall totals.
Given repeated rounds of rainfall expected and rainfall totals upwards of 1-2" for a good chunk of the state...combined with the recent wet period and river/creek/stream flooding...additional flooding will be likely. Areas of highest risk will be those near rivers/creeks/streams that have recently seen flooding, with minor flood potential expected elsewhere.
Additionally, as colder air filters in on Friday night and Saturday, rain may turn to snow across portions of Northern Illinois. At this time only a dusting looks likely, though potential exists for slightly higher accumulations should some model guidance pan out.
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