Very pleasant fall weather will be over the Midwest and Chicago metro area (see graphic) this week. The ridge of Canadian high pressure presently over the area will move east. An upper level disturbance will move over the area Wednesday with some clouds and maybe a few sprinkle, but then weak high pressure will control the weather into the end of the week. With dry air in place, highs will warm nicely during the day with lots of sunshine and then cool off rapidly at night with mostly clear skies.
For the Chicago metro area, the very moist airmass that covered the area last Thursday is gone. The dew points that were around 70 have dropped into mostly the mid 40s. This dry air will allow highs to warm into the 70-75 degree range the beginning of the week to around 80 by the end. Overnight lows will drop into the 40s away from the city heat early in the week to the 50s by the end of the week. Overnight lows will be warmer in the city and near the lake. In other words, typical weather for the end of September.
Unfortunately, this looks like another dry week, maybe some sprinkles possible Wednesday. While the city experienced flash flooding Wednesday evening with the 4+ inches of rain, the rest of the area only received rainfall that was mostly less than 1/2 inch. Other than the immediate city and over northwest Indiana, the rest of the area is in the "abnormally dry" category.
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