Friday's break in the three-day string of 94-degree highs Chicago area residents sweltered through Tuesday, Wednesday and Thursday, ends briefly Saturday afternoon and evening when a resurgence of heat is expected to result in the week's fourth 90-degree-plus high--and set the stage for potentially powerful thunderstorms expected to hit with a cold front Saturday night.
Friday's official 86-degree high at O'Hare International Airport occurred at 11:29 a.m. before readings declined slowly through the afternoon as northeast winds delivered cooler air.
Perhaps even more significant was Friday's humidity pullback. Dew points--a measure of atmospheric moisture--dropped 15 degrees from the low 70s Thursday to the mid-50s late Friday.
Changes ahead
Big weather changes loom--including the threat of potentially severe storms Saturday night--as
temperatures fall to the low to mid-80s Sunday then the low to mid-70s Monday and Tuesday.
Friday's official 86-degree high at O'Hare International Airport occurred at 11:29 a.m. before readings declined slowly through the afternoon as northeast winds delivered cooler air.
Perhaps even more significant was Friday's humidity pullback. Dew points--a measure of atmospheric moisture--dropped 15 degrees from the low 70s Thursday to the mid-50s late Friday.
Changes ahead
Big weather changes loom--including the threat of potentially severe storms Saturday night--as
temperatures fall to the low to mid-80s Sunday then the low to mid-70s Monday and Tuesday.
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