Yesterday I wrote an article describing how the Midwest really had a split weather personality. The graphic on the left from the Midwest Regional Climate Center really shows this weather split. The northeast half where there were showers, clouds, and lake influence had highs only in the 50s and 60s. Not all that far away to the southwest with more sunshine and no lake influence, highs were well into the 80s. A drive of only a few hundred miles had you either in a warm jacket or shorts and T-shirt.
Unfortunately for the Chicago metro area, we were in the jacket segment. Highs only in the 50s and 60s with scattered showers. That chill will last today and Friday with highs only in the 50s. With clouds, rain and a chilly wind off the lake, highs on Saturday will only be near 50. Normal high is now 63 and rising.
The big news is that this weather split personality will change next week. A rapid change in the jet stream location to near the Canadian border will produce a much warmer and stormier pattern over all the Midwest next week. Highs from Tuesday through the rest of the week will be in the 70s, and even some 80s are likely. With this jet pattern shift will come increased moisture and periods of storms through the week. Much needed rain will fall, but the chances of severe storms will also rise.
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