Clouds moved back in Thursday as low pressure to the southeast lifts
back north and northwest. Moisture in the atmosphere has increased a
little, but skies should remain rain free through Friday afternoon.
Winds shift to the southeast Friday and Saturday ahead of another low
pressure system, forecast to move into the Upper Midwest Saturday
afternoon. This low will likely bring a few thunderstorms to parts of
the Stateline during the
first half of the day Saturday. Strong to
severe storms could redevelop during the afternoon, something we'll need
to keep an eye on. Once that low passes Saturday evening, southwest
winds will take hold through the remainder of the weekend and into early
next week. The increase in the southwest wind will also bring an
increase in moisture, pushing dew point temperatures into the mid/upper
60s, and even low 70s, in some locations across northern Illinois and
southern Wisconsin. Sunday is looking to be a mostly dry afternoon as
the greatest area for thunderstorm development remains further to the
west. This will allow temperatures to rise, for most, into the mid 80s
for the afternoon. Although there could be a few locations that reach
the upper 80s.
The combination of the warmer temperatures and high dew points will push
the heat index for Sunday and Monday close to 90 degrees! And after a
relatively 'cool' May, our bodies won't be quite used to that. The
moisture will still be in place Monday with a slightly higher chance for
thunderstorms during the afternoon. Storm coverage increases as a cold
front comes in from the west Tuesday and Wednesday, and this could lead
to heavier rainfall heading into the middle of next week.
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