Incoming cold front brings thunderstorms Monday night; Isolated severe storms possible

 

A line of strong to severe thunderstorms continues to march east Monday evening, impacting much of southwest Wisconsin and northwest Illinois.

A TORNADO WARNING has been issued for northwest Green County until 10pm as a severe thunderstorm, capable of producing a tornado, was moving right over Blancharville, WI.  This storm is moving to the northeast at 40 mph, and away from the immediate area.  While radar indicates the rotation has weakened just a bit, very strong winds are possible as the storm passes.

Further south a few thunderstorms have been moving across the region, producing a bit of lightning and heavy rainfall.  Wind gusts to 30 mph will be possible with the storms moving into Stephenson and Ogle counties.  This line of storms extends all the way down through western Illinois into Missouri ahead of a cold front that will move through the Stateline early Tuesday.  

Ahead of the front isolated severe weather is possible as the low level jet increases from the southwest.  This is why we're seeing a few of these storms turn severe.  Thunderstorms will continue through roughly 12am-2am Tuesday before quickly shifting east by sunrise.  Winds will increase from the northwest gusting as high as 25 mph during the afternoon.