Strong Thunderstorms Possible Monday Evening

A narrow line of thunderstorms will move through northern Illinois and southern Wisconsin Monday evening.  The overall severe threat will remain low, but thunderstorms containing strong wind gusts over 50 mph are possible with some of the stronger thunderstorms.

Thunderstorms will move through between 6pm and 10pm Monday evening.  After that the cold front will have passed, bringing in a much cooler air mass for Tuesday morning.

Instability remains low over the Stateline due to the abundance of cloud cover we had earlier in the day.  But there is a little instability just a couple thousand feet above the surface of the earth (areas highlighted in green on the map to the left).  That, combine with winds over 50-60mph, will help sustain this

line of storms through the evening.

Once this line of storms passes our skies will begin clearing out.  But winds will remain strong through Tuesday morning.  Temperatures will quickly fall from the 60's Monday evening, down into the 30's by Tuesday morning.