Temperatures Saturday and Sunday soared into the low to mid 90s across
northern Illinois and southern Wisconsin, with a peak heat index Sunday
afternoon well over 100 degrees. Thunderstorms Sunday evening did bring
temperatures down, but didn't do much to get rid of the humidity. In
fact, it remained rather muggy through late Monday morning. That's when
a cold front came through, bringing down a drier air mass.
A couple cold fronts passing through the Midwest this week will keep
temperatures right at, or just slightly below, normal. Tuesday will
likely be our 'warmer' day with temperatures in the mid 80s. You may
also notice just a slight uptick in the humidity late Tuesday and
Wednesday, ahead of a second cold front that'll pass Wednesday
afternoon.
The heat from the weekend has pushed south and west as winds in the jet
stream shift to the northwest. The northwest flow will continue to feed
a drier and less moisture rich air mass into the Great Lakes. Weak
disturbances moving through the northwest flow will bring at least an
isolated chance for showers and storms late Tuesday, Wednesday and
Thursday, but with moisture lacking the risk for any significant storm
system will be reduced.
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