Monday Afternoon Weather Update

7:00pm Update: Scattered thunderstorms moved through southern Wisconsin and northern Illinois late Monday afternoon and evening producing heavy rainfall, frequent lightning and gusty winds. Most of the storm activity has shifted to the east over Lake Michigan, but a few scattered storms continue to rotate around low pressure in southern Wisconsin. As they rotate to the east and southeast, isolated storms will be possible through 9pm with skies turning partly cloudy overnight.

The overall severe threat has greatly diminished this evening with any stronger storms likely producing mostly small hail and heavy rain. There does remain a risk for stronger storms again Tuesday evening with the passage of another boundary/surface trough late in the day. Hail and wind would be the primary weather concerns during that time.



 
5:45pm Update: The line of thunderstorms has pushed east of the immediate area with skies turning partly cloudy this evening.  Additional thunderstorms continue to rotate around low pressure and are currently moving through southwest Wisconsin, keeping the storm chance through about 8pm/9pm this evening.  Skies will then turn partly cloudy overnight.

 3:30pm Update: The storm moving into northwest DeKalb County has had a history of producing torrential rain and winds in excess of 40 mph.  A couple of our Weather Watchers have reported very heavy rain and strong winds as the storm moved through Esmond and the Fairdale/Kirkland area.

Additional thunderstorms have moved into northwest Illinois and will also be capable of

very heavy rain, frequent lightning and strong winds.

A Severe Thunderstorm Warning has been issued for southwest Whiteside County until 4:15pm Monday afternoon.  Storms located over eastern Iowa have had a history of producing strong wind gusts.  These storms are moving east at 35 mph with the greatest threat quarter sized hail and 60 mph wind gusts possible.

Additional thunderstorms are also moving across northwest and north-central Illinois.  Those

storms are not currently severe but are capable of heavy rainfall and frequent lightning.  There does remain a slight risk (area outlined in yellow) for strong to severe storms Monday as a cold front works across Wisconsin and Illinois.  Greatest threat with the storms will be hail, followed by strong winds and heavy rain.  Most of the storm activity should be done around sunset.