Monday's highs soar to the 80s. Southerly winds will increase by afternoon, and especially this evening when gusts could reach 40-45 mph. Storms threats move in overnight. Severe weather is possible overnight and into early Tuesday morning. The Storm Prediction Center is keeping Chicago at a Level 2 for severe chances, mainly overnight.

There's uncertainty about late-night thunderstorms, with some models predicting only light showers while others show a stronger storm line. Tomorrow will be cooler and windy, with another round of rain expected Wednesday into Thursday.