(11:00PM Wed, July 19th 2023) Wednesday night update, regarding multiple disturbances and storm systems that will continue to move through the region through Thursday, along the southern flank of mean troughing in Canada/Great Lakes, and along the northeastern periphery of a ridge in place across the Desert Southwest/Southern Plains. This pattern will continue to support daily chances for rain/t’storms and severe t’storms across portions of the state during this period.

Update…

•With this update we have adjusted severe t’storm probabilities on tonight’s forecast, based on real time information, trends, and the latest model guidance.

•With this update we have adjusted severe t’storm probabilities on Thursday’s forecast, based on real time information, trends, and the latest model guidance.

​Timing & Location…

•Tonight – Early Thursday Morning, July 19-20th: Northwestern, Central & Southern Illinois.

•Thursday, July 20th: Northeastern, Central & Southern Illinois.

Impacts…

•A level 1 severe t’storm risk is in place across Southern Illinois, from early tonight through early Thursday morning. Isolated severe t’storms will be likely, posing a risk of damaging winds and large hail.

•A level 1 severe t’storm risk is in place across Northeastern, Central and Southern, from early Thursday morning through early Thursday night. Isolated severe t’storms will be likely, posing a risk of damaging winds, large hail and an isolated tornado.