(11:00AM - 7/29/21) A storm system continuing to move through the region today will bring severe t'storm potential to portions of the state through Thursday night.
A storm system moved from the Northern Plains into the Midwest on Wednesday, and will push eastward across the Great Lakes today. This storm system will bring severe t'storm potential to portions of the state, through tonight.
This Morning - Tonight, July 29th...
Areas of rain and t'storms have been ongoing this morning across portions of Northern and Central Illinois. Some of this activity may regenerate through the day across Central Illinois, with additional development also likely to occur along a southward advancing cold front that will be moving across Central Illinois today. All of the activity will move southward through the day today and into tonight, across Central and Southern Illinois. An environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 3,500-5,500J/KG, dew points in the low to upper 70's, modest shear, modest forcing, and modest lapse rates of 6.0-7.5C. This environment will be supportive of upwards of an isolated to sporadic severe t'storm risk (levels 1-2) across portions of Central and Southern Illinois. Damaging winds and hail will be the severe weather threats, though an isolated tornado can't be ruled out.
Below are the severe t'storm forecasts for this event.
Wednesday Afternoon - Wednesday Night, July 28th...
A large complex of t'storms that originated up across Minnesota and Wisconsin moved across Northern Illinois Wednesday night into early Thursday morning. Sporadic t'storms were severe with this complex, producing damaging winds.