(11:45PM – Monday, February 10th, 2025) Monday night update on a winter storm that will impact the state from Tuesday night through Thursday morning, bringing impactful winter weather to the state, headlined by the chance of several inches of snow across a large portion of the state.
Timing…
•Tuesday night – Thursday morning, February 11-13th.
Location…
•Much of Illinois.
Impacts…
•Snow accumulation ranging from 2-5″ to 4-7″ will be possible across much of Northern and Central Illinois, with locally higher amounts possible. A gradient in snowfall totals, with a quick drop-off, will be between I-72 and I-70 in Central Illinois. Sleet/pellets will also be possible along this gradient.
•Freezing rain/ice accumulation of <0.10″ will be likely across portions of Central and Southern Illinois, with locally higher amounts possible.
•While high winds are not expected, wind gusts of 15-30MPH will still lead to some blowing and drifting of snow, especially in open/rural areas.
•Moderate to heavy snowfall rates will be possible at times across portions of Northern and Central Illinois.
Update…
With this forecast update, little to no changes were needed to the going forecast. We continue to monitor new weather guidance continuously coming in, and will make adjustments if warranted in future updates.
Discussion…
•As a storm system moves through the region, precipitation will spread across the state from Tuesday night through Thursday morning.
•Across Northern and portions of Central Illinois, snow will be favored for the duration of this winter storm. While broad snowfall accumulation of a couple of several inches will be possible, a corridor of higher snowfall accumulation will be possible. Additionally, a gradient in snowfall amounts will be likely on the southern end of the main snowfall axis. This gradient may set-up between I-72 and I-70 in Central Illinois. Sleet/pellets will be possible along this gradient area as well.
•Across other portions of Central and Southern Illinois, a corridor of freezing rain will be possible, with precipitation mostly expected to be rain across far Southern Illinois.
