Monday Evening Weather Update

Showers and thunderstorms have developed mostly over southern Wisconsin this evening with reports of pea sized hail and a few stronger (mostly to 40 mph) wind gusts.  Most storm activity through the evening will remain north of the state line, leaving the majority of northern Illinois dry. 

An upper level low, otherwise known as a shortwave, is moving into northwest Iowa.  Ahead of this feature there was just enough sunshine this afternoon to produce some instability in the atmosphere to allow for a few showers and thunderstorms to develop.  Wind flow in the atmosphere is mostly from west to east, so anything that does develop out west will move east into Wisconsin.  There is a thin line of showers over central Iowa, but current indications suggest this band will fade away before reaching northern Illinois and southern Wisconsin this evening.