Dynamic weather system to bring rain, wind, snow, and crashing temperatures Sunday

 A dynamic winter system will bring rain and isolated thunder early Sunday, then plummeting temperatures, snow showers, and very strong winds Sunday night. Below is a breakdown of the next 36 hours.

SATURDAY NIGHT: Fog remains the initial concern this evening with visibility under a mile for most. Dense fog possible especially West of I-39 through 12PM Sunday. Rain showers will begin to arrive in scattered form after 3-4AM.

SUNDAY MORNING-AFTERNOON: Steady to even heavy rain showers will be possible, with an isolated risk for some thunderstorms near and South of I-88. A low-end severe risk is also possible toward I-80. Locally gusty storms may be possible, but the severe threat is minimal this far North. We will see a bit of a lull in precipitation Sunday afternoon as the developing low pressure system passes overhead, but big changes swing through on the tail end of the low.

SUNDAY EVENING-NIGHT: Temperatures will come crashing down immediately on the back side of the low, with a near 30-degree drop in a matter of 6-8 hours. Rain will quickly switch over to a mix and then snow after 6PM, as temperatures drop below freezing shortly after that. Wind will also pick up very quickly during this time, with gusts approaching 40-45 mph by evening and near 45-55 mph overnight into Monday.

MONDAY MORNING: Scattered snow showers will linger into Monday morning, with steadiest snow falling across Southern Wisconsin, where 2" or more could come down. Most in Northern Illinois may see about a dusting to an inch or two. Any falling snow will significantly limit visibility with the strong winds. Any moisture on roadways will quickly freeze over, causing hazardous travel Sunday night into Monday morning. Strong winds persist into Monday, with gusts remaining strong through Monday afternoon. A WIND ADVISORY will remain in effect through 6PM Monday.

The biggest threats with this system will be the very strong winds and sharply falling temperatures causing a flash freeze. Sunday afternoon may see temperatures in the 50s, while Monday morning will be in the teens.