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

(11:45AM - 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, July 20th...
Isolated to scattered showers and t'storms have been ongoing this morning across portions of Southern Illinois. As a disturbance moves across the state today, additional scattered showers and t'storms will develop and move across Southern, and perhaps portions of Central Illinois, this afternoon into tonight. An environment in place will feature moderate instability, high moisture, marginal shear and marginal forcing will be in place. This will support upwards of a minimal severe t'storm threat across the southern portion of the state. Damaging winds and large hail will be the main threats. Additionally, given recent heavy rainfall across Southern Illinois and the expected additional rainfall, some localized flooding and high rainfall totals will be possible.

Tuesday, July 21st...
Isolated to scattered showers may 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 with it. This activity, int he form of clusters, 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 will be in place. 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 are the severe t'storm forecasts for Monday afternoon - Monday night and 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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