Summer officially begins Friday at 10:54 am and with the official start
of Summer will come the threat for showers and thunderstorms, some of
which could produce heavy rainfall and strong to severe storms. Friday
morning will start dry but increasing cloud cover will occur mid to late
morning.
A complex of thunderstorms will be moving in from the west but will be
weakening as they
move across Iowa. It does look like they'll hold
together long enough to bring a shower/storm chance to northern Illinois
and southern Wisconsin after Noon. No severe weather is expected at
that time.
Skies will then dry going into Friday evening before another complex of
thunderstorms develops to the southwest Friday night. Those storms will
lift northeast by Saturday morning
into northwest Illinois. A warm
front will be located southwest of the Stateline during the day Saturday
and will be the focus for thunderstorms during the afternoon. As the
warm front begins to lift into the Stateline Saturday evening, the
chance for showers and thunderstorms will increase late Saturday.
Several disturbances will move through the Midwest Sunday afternoon and
evening. Strong to severe storms will be possible during that time, but
then again Monday as low pressure moves into northern Illinois.
Increasing moisture over the weekend will also lead to the potential for
heavy rainfall with rain totals over one to two inches. The weekend
won't be a complete washout, but if you do have any outdoor plans make
sure you pay attention to the forecast and have a backup plan should
storms move through.
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