The Midwest will experience a variety of weather conditions this week as the upper air pattern wobbles back and forth between a southwest flow and a northwest flow. The pattern is becoming more energetic as cooler air starts to spread south from Canada. Early this week we had a northwest flow which brought down some cool Canadian air and much needed rainfall along the cold front. As can be seen in the graphic from the Chicago Tribune, overnight lows Tuesday morning were from the upper 20s to the 30s across the northern Midwest.
The cool air is now history. The Canadian high pressure center is now along the east coast with a warm southwest flow developing over the center of the nation. By Thursday, highs will be well into the 80s over the Midwest, with some 90s from central Missouri into central Illinois as seen in the graphic. Dew points will jump into the upper 60s making for a very summer feeling day. From heat to air conditioning for some places, especially over the northern Midwest.
The late season combination of heat and humidity will set the stage again for more rainfall Thursday night and Friday as a cold front and deepening upper level trough move through. More rainfall to dent our drought. Heaviest rainfall is expected in a band from eastern Kansas into northeast Wisconsin where average rainfall amounts are expected to be 1.5+ inches.
For the Chicago metro area, two season in one week. After the chilly overnight lows Tuesday morning with lows into the 40s over the northwest suburbs, we will see highs in the upper 80s Thursday. After the cold front passes, highs over the weekend will be around 70, with some lows around 50 for Sunday morning. Best chances of rain are late Thursday night into Friday morning with average rainfall amounts expected to be around 1 inch.
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