Severe thunderstorm warning issued for some Illinois counties

As many are celebrating America's 250th birthday, a threat of severe weather looms, as watches and warnings have been issued for most Illinois and northwest Indiana counties for Saturday.

A Severe Thunderstorm Warning is in effect for De Kalb, Kane, and McHenry counties in Illinois until 2:45 p.m.

A Severe Thunderstorm Watch has been issued for DuPage, Kane, Kankakee, Grundy, Kendall, and Will counties in Illinois and for Porter, Newton, Jasper, and Lake counties in Indiana until 7 p.m.

A Flash Flood Warning is in effect for De Kalb, La Salle, and Lee counties in Illinois until 5 p.m.

Storm Prediction Center has areas along and south of I-80 at a Level 1 (out of 5) for severe chances. Strong-to-severe storms are expected around 2 p.m. and sunset. Frequent lightning, damaging winds and torrential downpours may accompany the strongest storms.

Be sure to stick with CBS News Chicago and the First Alert Weather team for the latest.