An almost totally decayed thunderstorm complex moved across the north central part of Illinois during the supper hour on Thursday. It will fade completely from the picture as it moves into NW Indiana. A warm front stretches across central Illinois to Macomb across southwest Iowa into south central South Dakota this evening. It is iffy, but there is a possibility of another thunderstorm complex (MCS) developing to the north of the warm front over SE South Dakota, NW Iowa, or SW Minnesota tonight as a low level nighttime jet increases in strength riding into the warm front in that area. If the MCS does develop, it is anticipated to move toward the east/southeast across Iowa into the NW part of Illinois by late tonight, and into the Stateline area in the early morning hours on Friday.
On Friday the front will slowly edge to the north of the Stateline, and there could be some morning thunderstroms. It will become breezy and warmer on Friday with a high in the middle to upper 80's. The wind in the afternoon will be quite brisk running a steady 20 mph with gusts as high as 30 mph. The humidity will be noticably higher with dew points from 65 to 69 degrees.
The front will be north of our area on Friday evening, but once again will serve as a focal point with a disturbance riding up over the upper level ridge, and once again a thunderstorm complex may form to our west and move into the Stateline on Friday night.
Our region will still be in the steamy air on Saturday, but it appears at this time as if the front to our north will begin to sag toward the south. Once again it could generate some thuderstorms Saturday afternoon and Saturday night.
It now appears as if it will be very near by on Sunday, and with disturbances riding along it from the southwest, more storms are possible, and it temperature will top out in the upper 70's as the front edges toward the south.
Much of this forecast is tenative because the models are not handling the current weather senario very well. Candice King will update in the morning, and she may get a clearer picture from the new model runs.
By Meteorologist
Eric Nefstead
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