What a difference a week makes when it comes to weather! Last week, very cool for the season air was over the Midwest. Highs were only reaching levels that are normal in late September, not mid August. Overnight lows in the 30s were common across the northern parts of Wisconsin and Minnesota. The graphic from the MRCC shows that the cool pattern dated all the way back into July. Most of the Midwest has experienced a below normal summer for temperatures.
The cool air pattern has finally changed. The persistent upper level trough that was over the northern US feeding down the cooler air is being replaced by an upper level ridge. The jet stream is now running across southern Canada. With the jet much farther north than during the past month, temperatures have rebounded well into the 80s across the Midwest. The previous pattern also produced very heavy rains over the southeast part of the country the past 60 days. Rainfall amounts from northwest Florida into the Carolina's have been 12-16 inches above normal.
For the Chicago metro area, the weather well into next week will be very warm and mostly dry. Highs will be roughly from 85-90, a little cooler on Thursday. There is a small chance of storms late Wednesday night into Thursday morning as a weak cold front moves through. After that it looks very dry and warm with upper level high pressure over the area. We are becoming dry, "abnormally dry" according to the US Drought Monitor.
You can follow my articles by clicking on the “Subscribe” link on top.
Comprehensive weather articles and discussion can be found at http://www.storm-central.com