While there is great potential for locations in the Midwest to reach triple digit heat, there are also a few things that may keep us just shy of the century mark. With jetstream winds remaining from the northwest today temperatures will rise to a comfortable 83° this afternoon. High pressure at the surface will shift into the Ohio River Valley tonight switching surface winds around to the south. This will keep temperatures a little warmer from where we were at this morning.
By Wednesday a warm front will pass through the area and temperatures will quickly rise into the low 90s while 100 degree heat could be as close to us as eastern Iowa. The jetstream pattern by Wednesday afternoon will feature a building ridge across the Midwest and Great Lakes, but as an area of low pressure kicks out of the Pacific Northwest a weak cool front will move closer to the Stateline by Thursday afternoon. The will cause the jetstream to flatten a bit across southern Wisconsin. Depending on how quickly the front comes through will determine just how hot we get Thursday afternoon. If the front comes through earlier in the day temperatures may remain confined in the upper 90s while 100 degree heat is found just to the south. There are also a couple weather computer models that are trying to forecast an upper level disturbance riding over top the ridge in the jetstream which would likely cause some cloud cover along with a slight chance of a shower or two. However, should the front slow its progress southeast compressional heating ahead of the front will allow for temperatures to rise near 100 degrees for many in the northern Illinois. Either way, it's going to get hot and it looks like the heat is going to stay through the weekend. The last time we hit 100° was back in the middle of July in 2011. Before that it was July of 1989 when the mercury rose to 100 degrees.
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