Heavy rain producing thunderstorms moved through southern Wisconsin and northern Illinois Thursday morning bringing anywhere from half an inch, up to nearly 3 inches of rain in some locations. We needed the rain as the deficit for July had fallen to over an inch.
The thunderstorm activity also delayed temperatures from reaching the 90s, but did not limit the rise in humidity. Dew point temperatures soared into the mid and upper 70s, pushing the heat index valued into the upper 90s and low 100s!
With the dew point temperature so high tonight, overnight lows will only fall into the mid 70s. The warm start to Friday morning will help highs rise into the mid and upper 90s for tomorrow afternoon. There will likely be thunderstorms that develop again Thursday evening and night, but the focus should be more to the north over Wisconsin.
A cold front will approach southern Wisconsin
and northern Illinois during the late afternoon and evening hours on Saturday, bringing rain and thunderstorms to the area. Heavy rain will be the greatest concern with slow moving thunderstorms moving parallel to the cold front Saturday night.
Slightly cooler and drier air arrives Sunday bringing an end to the heat and humidity. Temperatures next week will remain in the low to mid 80s, more seasonable for this time of year.
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