(11:00PM - 10/22/21) A storm system moving through the region will bring severe t'storm potential to portions of the state, Sunday morning through late Sunday night.
A storm system move from the Plains on Sunday morning, then into the Great Lakes by Monday morning. This storm system will bring severe t'storm potential to portions of the state, Sunday morning through late Sunday night.
Sunday Morning - Sunday Night, Oct 24th...
Widespread areas of rain and t'storms will spread across much of Northern and Central Illinois, from late Saturday night/early Sunday morning through late Sunday afternoon. With a warm front expected to be meandering across Central Illinois and an associated marginal severe t'storm environment, an isolated severe t'storm will be possible across Central Illinois Sunday morning through Sunday late afternoon.
The main focus will come a bit later, as scattered showers and t'storms that develop along a cold front across Eastern Kansas and Missouri Sunday afternoon will sweep eastward, making it to the Missouri/Illinois border by early Sunday evening, and then spreading across Central and Southern Illinois Sunday evening through Sunday night. Ahead of this activity, the environment across the state will be supportive of some severe t'storm threat. This environment will feature low instability of 5000-2,000J/KG, dew points in the low to mid 60's, good forcing, and lapse rates of 5.5-7.0C. This environment will be supportive of upwards of a level 1/isolated to level 2/sporadic severe t'storm risk across Central and Southern Illinois. Damaging winds, hail and isolated tornadoes will be the severe weather threats.
Below is the severe t'storm forecast for this event.