After a very extended period of below normal temperatures for the Midwest, the switch is about to flip the other way. The very persistent upper level trough over southern Canada into the northern US is about gone. In its place is the relocation of the jet stream into southern Canada into early next week, with the gradual development of an upper level ridge over the area. All this means that late summer warmth will be with us heading into the end of August.
The graphic from the MRCC shows just how cool it has been over the Midwest so far in the month of August. Temperature departures range anywhere from 2 to 7 degrees below normal, the coolest far north. Last weeks chill saw overnight lows into the 30s across the northern parts of Wisconsin and Minnesota. The readings were just above frost levels. Unfortunately, with the chill has come dry conditions except in the far southern Midwest. As I pointed out the other day, parts of Illinois and Iowa are now "abnormally dry."
For the Chicago metro area, a complete switch in temperatures compared to last week. Last week we had highs of 10-12 degrees below normal. This week we will see just the opposite. Highs all this week will be in the 85-90 range. The only chance of rain looks to be late Wednesday night or Thursday. This rain is not a definite by any stretch of the imagination.
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