Sun, Sept 6th Severe T'Storm Threat Update #2

(10:00PM - 9/6/20) A storm system is expected to move through the region on Sunday, bringing a low end threat for severe t'storms to Northern and portions of Central Illinois.

Summary...
A complex of scattered showers and t'storms is expected to spread across Northern and portions of Central Illinois, Sunday morning into early Sunday afternoon. A marginal environment will be in place, which will support an isolated severe t'storm threat, with damaging winds and large hail being the main threats. In the wake of this activity, the amount of clearing and destabilization that occurs is in question, and thus casts doubt on the secondary potential for Sunday afternoon into Sunday night. At this time it appears possible that additional isolated to scattered showers and t'storms will develop Sunday afternoon along an advancing cold front, across portions of Wisconsin, Iowa and Northwest Illinois. This activity will then push east-southeast across portions of Northern Illinois, posing an isolated severe t'storm threat late Sunday afternoon into Sunday night. An environment in place will feature low to moderate instability, moderate moisture, good shear and good forcing. Upwards of a minimal severe t'storm threat is expected across portions of Northern Illinois, during both rounds of activity on Sunday. Damaging winds, large hail and an isolated tornado will be the main threats.

​Below is the severe t'storm forecast for Sunday morning - Sunday night.

JP

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