4:15pm Update: Widely scattered thunderstorms continue to move across northern Illinois and southern Wisconsin late Monday afternoon, all ahead of a little low-pressure system - known as an M.C.V (mesoscale convective vortex) leftover from the showers and thunderstorms Monday morning. The overall severe threat has remained pretty low with the storms so far this afternoon, but copious amounts of moisture over the region has led to heavy downpours with any thunderstorms that have developed.
The line of storms will continue to lift north into southern Wisconsin over the next 30-45 minutes, with isolated activity lasting through sunset. The humidity will remain high and temperatures warm through the night, only dropping to around 70 degrees. Light winds and plenty of moisture, combined with a stalled boundary near the state line, will lead to areas of fog and drizzle Tuesday morning.
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