(10:30AM Wed, July 19th 2023) Wednesday morning 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.
•With this update we have adjusted severe t’storm probabilities on today’s/tonight’s forecast, based on real time information, trends, and the latest model guidance.
•With this update little to no changes were needed on Thursday’s forecast.
Timing & Location…
•This Morning – Early Thursday Morning, July 19-20th: Northwestern, Central & Southern Illinois.
•Thursday, July 20th: Northeastern, Central & Southern Illinois.
•A level 1 severe t’storm risk is in place across Northwestern, Central and Southern Illinois, from early this morning through early Thursday morning. Isolated severe t’storms will be likely, posing a risk of damaging winds and large hail.
•A level 1 to 2 severe t’storm risk is in place across Northeastern, Central and Southern, from early Thursday morning through early Thursday night. Isolated to widely scattered severe t’storms will be likely, posing a risk of damaging winds, large hail and an isolated tornado.