Timing: A Look at When Severe Storms Could Hit Chicago Area

After a morning of showers and thunderstorms in the Chicago area, thunderstorms are expected to re-develop later in the afternoon, growing more widespread into the evening

Another round of potentially severe storms is headed toward the Chicago area, and once again the system threatens to bring hail, damaging winds and possibly even isolated tornadoes during the evening and overnight hours. 

After a morning of showers and thunderstorms in the Chicago area, thunderstorms are expected to re-develop later in the afternoon, growing more widespread into the evening.

Isolated storms could pop up through the late-morning and afternoon hours, though these storms aren't expected to become severe. 

The severe weather threat increases by around 8 p.m. Friday and continues until early Saturday morning across the entire metro area. 

Some of the storms that develop during that time could bring large hail, damaging winds and the potential for an isolated tornado. Torrential rainfall is also possible, which could bring localized flash flooding to some locations.

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A Flash Flood Watch is in effect for most counties beginning Friday evening and continuing through Saturday morning. 

Counties included in watch are Cook, DeKalb, DuPage, Grundy, Kane, Kendall, LaSalle, Lake, McHenry and Will counties in Illinois and Lake County in Indiana. 

The watch warns that storms will be capable of producing heavy rainfall rates of up to 2 inches per hour. 

The severe threat is currently forecast to last until 4 a.m. Saturday, though rain could linger well into Saturday morning. 

Adding to that, the chance for periodic showers and storms continues each day for the long weekend.

Temperature highs will sit in the 70s through Memorial Day.

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