Sun-Wed, July 19-22nd Severe T'Storm Threat Update #1

(9:30PM - 7/20/20) Multiple disturbances will be moving through the region during this period, which will bring the chance for a low end severe t'storm threat to portions the state each day.

Summary...
Monday Night, July 20th...
Isolated to scattered showers and t'storms will continue to be possible across portions of Central and Southern Illinois. A very marginal environment is in place, thus only a very isolated severe t'storm will be possible. Damaging winds and large hail will be the main threats. Additionally, given recent heavy rainfall for some areas and the possible additional rainfall, some localized flooding and high rainfall totals will be possible.

Tuesday, July 21st...
Isolated to scattered showers will be ongoing Tuesday morning across portions of Central and Southern Illinois. In the wake of this potential early day activity, some clearing and destabilization will occur across the state. As another disturbance moves across the state on Tuesday, scattered showers and t'storms will move across the state along with it. This activity, in the form of clusters and scattered activity, will push across the state Tuesday afternoon into Tuesday night. An environment in place will feature moderate instability, high moisture, marginal shear and marginal forcing. This will support upwards of a minimal severe t'storm threat across much of the state. Damaging winds and large hail will be the main threats. Additionally, given recent heavy rainfall across portions of the state and the expected additional rainfall, some localized flooding and high rainfall totals will be possible.

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

Recap Summary...
Sunday, July 19th...
As a "cold" front pushed into the state, an axis of scattered showers and t'storms developed ahead of it, and moved across portions of Northern and Central Illinois, early Sunday morning into early Sunday afternoon. Some of this activity was severe, with damaging winds being the common threat. Localized flooding also occurred in some areas. Additional scattered showers and t'storms developed across portions of Central and Southern Illinois Sunday afternoon and evening. This activity moved across these areas through Sunday night. Isolated severe t'storms occurred, with damaging winds and large hail having been the common threats. Localized flooding also occurred in some areas.

JP

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