(11:45AM – Monday, March 30th, 2026) Severe t’storm threat from this evening through Tuesday night…
⚠️Update…
•With this update, we have increased severe t’storm probabilities across portions of Northern Illinois on the forecast for this evening through early Tuesday morning, as slightly higher coverage of potential may exist. Additionally, we have added an area of significant severe hatching.
•With this updated, only minor severe t’storm probability expansion was needed to the going forecast for Tuesday morning through early Wednesday morning.
⏰📍Timing & Location…
•This Evening – Early Tuesday Morning, March 30-31st: Northern Illinois.
•Tuesday Morning – Early Wednesday Morning, March 31-April 1st: Northern & Central Illinois.
⚡️Hazards…
•A level 1 to 2 severe t’storm threat is in place across Northern Illinois from this evening through early Tuesday morning, for the threat of isolated to widely scattered severe t’storms. Large hail and damaging winds will be the threats with activity. Some significant severe t’storms will be possible, capable of producing very large hail (2.00″+) and/or significant damaging winds (75MPH+).
•A level 1 severe t’storm threat is in place across much of Northern and Central Illinois from Tuesday morning through early Wednesday morning, for the threat of isolated severe t’storms. Large hail and damaging winds will be the main threats.
✔️Summary…
•As a lead disturbance moves through the region, isolated to scattered showers and t’storms will develop across Iowa on this evening. This activity will then track across Northern Illinois from later this evening through early Tuesday morning. Some severe t’storm threat will be possible with this activity.
•Some lingering shower adn t’storm activity may be ongoing across portions of Northern and Central Illinois on Tuesday morning, residual activity from overnight. In the wake of this activity, as a main storm system passes through the region, scattered showers and t’storms will develop on Tuesday afternoon across portions of Northern and Central Illinois, along and in the vicinity of an advancing cold front. This activity, along with further development to the southwest, will then track across much of Northern and Central Illinois from Tuesday afternoon through early Wednesday morning. Some severe t’storm threat will be likely with this activity.