The National Weather Service in Chicago issued a tornado warning for Lake County and parts of Cook County on Wednesday night. The warning was in effect until 7:45 p.m., the weather service said.
There is still concern for thunderstorms, with an increased chance of storms north of I-80, and another warm, humid day is expected Thursday with storms possible in the evening, the weather service said.
A warning means a tornado is occurring or imminent, said Ed Fenelon, a meteorologist with the National Weather Service in Romeoville. “So basically it’s a time when people really want to move to a basement or an indoor room on the lowest level,” he said.
Shortly before 7 p.m., a severe thunderstorm capable of spurring a tornado was spotted over Wauconda and was moving east at 30 mph, the weather service said. Radar indicated rotation, and a subsequent warning was issued for Lake County in northeastern Illinois, northwestern McHenry County and north central Cook County.