The Midwest will experience the temperature equivalent of two seasons in one week. Through Tuesday we will experience summer heat with highs well into the 90s, even some highs around 100 over parts of Iowa. By the end of the week the heat will be all history with highs only in the upper 50s northeast to the low 80s southwest. For northern sections it will be a 35+ degree temperature drop in the highs from Tuesday to Friday. From summer to fall in only three days.
The graphic shows the early afternoon temperatures Friday as forecast by the GFS model. The actual highs will be a couple of degrees warmer, but basically we are looking at the 50s over northern Michigan to the low 80s over southwest Missouri. The center of the Canadian high pressure system is over lake Superior. The temperature change is a result of a huge shift in the upper air pattern. The upper level ridge that is producing our heat will be moving west over the Rockies. To the east of the ridge will be a northwest flow out of Canada bringing down the much cooler air.
For the Chicago metro area, summer and fall in one week. Highs both today, Monday, and tomorrow well into the 90s with low 70s dew points. Highs will be near 100 over the west part of the state near the Mississippi river. We will likely tie or more likely break the record high of 95 for Tuesday. Wednesday will see more clouds and hopefully some rain as a cold front moves into the area. The drought continues to expand nearby. By Friday, highs are expected only around 70, or a 25+ degree drop in the highs from Tuesday to Friday.
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