(11:00AM – Saturday, April 19th, 2025) Saturday morning update on another storm system moving through the region, which will bring additional rounds of shower and t’storm activity to the state from Saturday morning through early Monday morning. Severe t’storms will be possible with some of this activity.
Timing & Location…
•Saturday Morning – Sunday Morning, April 19-20th: Southern Illinois
•Sunday Morning – Early Monday Morning, April 20-21st: Much of Illinois.
Impacts…
•A level 1 severe t’storm threat is in place across portions of Southern Illinois from Saturday morning through Sunday morning, for the likelihood of isolated severe t’storms. Large hail, damaging winds and an isolated tornado will be possible with activity.
•A level 1 to 2 severe t’storm threat is in place across a large portion of Illinois from Sunday morning through early Monday morning, for the likelihood of isolated to widely scattered severe t’storms. Large hail, damaging winds and a couple of tornadoes will be possible with activity.
Discussion…
•For Saturday morning through Sunday morning… As one storm system departs the region and the next storm system approaches the region, a stationary front will be in place in the vicinity of Southern Illinois between storm systems. Waves of scattered shower and t’storm activity will be likely across the southern half of the state, from Saturday morning through Sunday morning. Severe t’storms will be possible with some of this activity.
•For Sunday morning through early Monday morning… As the next main storm system moves through the region on Sunday into Monday, a few waves of shower and t’storm activity will be likely across the state during this timeframe. Of greatest focus will be severe t’storm activity that develops and tracks across Missouri during the afternoon. This activity will press into Western/Southwestern Illinois during the evening, eventually pushing deeper into the state Sunday night. With time, the severe t’storm threat will gradually wane with this activity, which is why higher severe t’storm probabilities are in place closer to the Illinois/Missouri border. There is also the chance for other activity to develop along a warm front lifting northward across the state on Sunday afternoon and evening, which would have the potential to affect portions of Northern and Central Illinois. Should this potential come to fruition, a severe t’storm threat will exist with this activity as well.
