(10:30PM Wed, July 12th 2023) Wednesday night update on multiple disturbances that will continue to move through the region through Friday, along the southern flank of a large upper level low in Canada 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…
•We have adjusted severe t’storm probabilities on tonight’s forecast, based on real time information and model guidance.
•We have adjusted severe t’storm probabilities across Southern Illinois on Thursday’s forecast, based on real time information and model guidance.
•We have issued our first forecast for Friday’s severe t’storm potential.
Timing & Location…
•Tonight – Early Thursday Morning, July 12-13th: Southern Illinois.
•Early Thursday Morning – Early Friday Morning, July 13-14th: Southern Illinois.
•Friday Morning – Early Saturday Morning, July 14-15th: All of Illinois.
Impacts…
•A level 1 severe t’storm risk is in place across Southern Illinois, from tonight through early Thursday morning. Isolated severe t’storms will be possible, posing a risk of damaging wind and large hail.
•A level 1 severe t’storm risk is in place across Southern Illinois, from early Thursday morning through early Friday morning. Isolated severe t’storms will be possible, posing a risk of damaging wind, large hail and an isolated tornado.
•A level 1 severe t’storm risk is in place across all of Illinois, from early Friday morning through early Saturday morning. Isolated severe t’storms will be possible, posing a risk of damaging wind, large hail and an isolated tornado.
