(11:45AM - 7/24/21) A storm system moving through the region today will bring severe t'storm potential to portions of the state, this afternoon into tonight.
A storm system moved across the Northern Plains on Friday, and will push eastward across the Midwest and Great Lakes today. This storm system will bring severe t'storm potential to portions of the state, this afternoon into tonight. The main questions for this event continue to revolve around coverage of activity, and the extent of the severe potential.
Saturday Afternoon - Saturday Night, July 24th...
In the wake of a few isolated showers and t'storms this morning across Northern Illinois, ample clearing and destabilization is expected this afternoon. Development of scattered showers and t'storms is expected this afternoon along a southeastward advancing cold front, across Southern Wisconsin, Northern Illinois and Iowa. This activity will then push southward across Northern and portions of Central Illinois, this afternoon into tonight. An environment will be in place supportive of a severe t'storm risk with some of this activity. This environment will feature high instability of 3,000-5,000J/KG, dew points in the low to upper 70's, decent shear, decent forcing, and poor lapse rates of 5.0-6.0C. This environment will be supportive of upwards of an isolated severe t'storm risk (level 1) across portions of Northern and Central Illinois. Damaging winds and hail will be the severe weather threats, though an isolated tornado can't be ruled out.
Below is the severe t'storm forecast for this event.