The National Weather Service says waves of strong storms, bringing hail, winds and lightning, could develop overnight into Sunday morning in Illinois.
The National Weather Service (NWS) issued a hazardous weather outlook Saturday afternoon.
The outlook covers Lake and McHenry counties, along with the rest of northern Illinois.
Storms are expected to develop in eastern Iowa around 8-11 p.m. Saturday, the NWS said.
They will likely move east into northern Illinois after 12 a.m., bringing a threat of damaging hail, damaging winds and frequent lightning.
Damaging hail could be capable of denting cars and siding and damaging winds could be capable of downing tree limbs and fences.
There will be periodic thunderstorm chances through Monday evening, the NWS said.
“While there remains uncertainty for timing and location, the best chances for thunderstorms appears to be tonight, Sunday night and Monday,” the weather service said.
Heavy rain and localized flooding are also possible, especially Sunday evening.
High temperatures are expected to reach the low to mid-80s on Sunday. A strong lake breeze is expected to move in from Lake Michigan with temperatures falling into the 50s near the lake.
Dry weather is expected to return Tuesday.
The NWS said residents should have at least one way to wake up if a severe weather warning is issued in their area.