Update: Second round of storms forecast for northern Illinois

Portions of northern Illinois are under a hazardous weather alert for Saturday, the National Weather Service stations in Davenport, Iowa and Romeoville said.

Update. The NWS said at 9 a.m. that counties along the I-88 corridor and southward should prepare for severe a second round of storms between 4 and 9 p.m. These storms would contain damaging wind gusts and large hail. People are advised to have many ways to receive warnings.

Northwest Illinois. Morning thunderstorms are expected in areas north of and along Interstate 80. Scattered T-storms will redevelop in the late afternoon and evening, especially along the Mississippi River. Downburst winds are the main threat. Also, dangerously high afternoon temperatures are expected, with heat index values of 95 to 100 degrees in areas just south of I-80.

Affected counties are Lee, Joe Daviess, Stephenson, Carroll, Whiteside, Rock Island, Henry, Bureau, Putnam, Mercer, Henderson, Warren, Hancock, McDonough, Scotland, and Clark.

North central and northeast Illinois. The risk of thunderstorms is elevated, with storms moving east-southeast at 30 mph. These storms may produce up to quarter-sized hail and some winds up to 60 mph. After morning rains, thunderstorm development in the afternoon and evening could be strong enough to produce damaging wind gusts and hail. The main risk area is south of I-88 and west of I-65 between 6 and 11 p.m.

Affected counties are Winnebago, Boone, McHenry, Lake, Ogle, Lee, DeKalb, Kane, DuPage, La Salle, Kendall, Grundy, Kankakee, Livingston, Iroquois, Ford, Cook, and Will.