Clouds have quickly increased Wednesday afternoon ahead of an active
storm pattern that is set to bring us repeated rounds of rainfall
through the weekend. The first round of rain arrives overnight
Wednesday, into Thursday morning. A cluster of showers and
thunderstorms moving through northeast Iowa Wednesday evening will
continue to move northeast, and could clip parts of northwest Illinois
between 7pm and 8pm. The chance for thunderstorms will quickly increase
after dark, towards Midnight,
with the arrival of a warm front. That
front will lift north into Wisconsin by daybreak Thursday. The overall
severe threat is expected to remain low, but thunderstorms with heavy
rainfall will be possible between 4am and 7am Thursday. Some of the
stronger storms could also have small hail. Those storms will continue
through mid-morning with a little lull in some of the activity heading
into the afternoon.
Lingering cloud cover, outflow boundaries and
any left-over showers and
thunderstorms will play a factor into just how warm we get Thursday, and
any additional thunderstorms that may develop later in the evening. If
storms develop as a cold front comes through, the risk for strong to
severe storms will be possible for portions of northern Illinois during
the evening. Damaging wind gusts and hail would be the primary
concerns, followed by heavy rainfall that could lead to flash flooding
Thursday night.
Rainfall totals through Thursday morning will add up between half an
inch and an inch with the first round of thunderstorms. The second
round of rain Thursday evening could bring rainfall totals of 1-3 inches
over portions of northern Illinois, especially where repeated rounds of
thunderstorms develop. Most of the storm activity will be ending
before Midnight Thursday with a little more dry air returning for
Friday. Just a slight chance for rain Friday evening, before the chance
ramps back up Saturday night going into Sunday.
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