Chicago Weather: Severe Thunderstorm Watch, Flash Flood Watch For Much Of Area

CHICAGO (CBS) -- A severe thunderstorm watch is in effect for the southwest Chicago area counties, and a flash flood watch is in effect for most of the area until 1 a.m.

There was also concern about rotation in one storm system that was moving into Northwest Indiana at 10:30 p.m.

Torrential downpours are likely as storms "train" in place overnight, and 1 to 3 of rain is possible by morning.

A tornado warning was also earlier issued for some counties southwest of the Chicago area.

Southeastern Marshall and northeastern Woodford counties were covered by the warning until 8:45 p.m. While the affected area abuts LaSalle County, that county was not included.

The latest round of thunderstorms come less than 24 hours after an earlier round pummeled the area Thursday morning. The best chances are expected through the overnight hours.

The severe thunderstorm watch is in effect for Will, Kendall, Grundy, Kankakee, and LaSalle, Lee, and Livingston counties, and parts west of those counties, until 1 a.m.

A severe thunderstorm warning was also issued for parts of Lake and Newton counties in Indiana.

The flash flood watch is in effect until Friday morning for most of the Chicago area, except for Lake and McHenry counties.

A flash flood warning was also issued until 3:15 a.m. for parts of Livingston, LaSalle, Grundy, and Kankakee counties. This was associated the storm system that was prompting the rotation concerns.

Damaging winds and large hail could accompany the strongest storms.

Front crosses our area in the morning and winds become northwesterly, pulling in dry air. Clearing throughout the day with highs in the mid 70s away from the lake.