A large portion of Illinois, including Lake and McHenry counties, are expected to get severe thunderstorms Tuesday evening. | Graphic Provided by the National Weather Service.

More thunderstorms capable of producing isolated tornadoes, 80 mph winds, hail and flooding are expected Tuesday evening in northeastern Illinois, including Lake and McHenry counties.

The National Weather Service (NWS) said a line of storms will develop from eastern Iowa to southern Wisconsin late Tuesday afternoon.

The storms will track into northern Illinois Tuesday evening and damaging winds that could become “potentially significant” are the primary risk, the NWS said.

The storms are expected to begin around 6 p.m. in McHenry County and last until around 10 p.m. They are expected to begin in Lake County around 7 p.m. and last until around 11 p.m.

Areas impacted by the storms could see winds strong enough to uproot trees, torrential downpours, large hail and a brief embedded tornado, the NWS said.

“The storm that develops later Tuesday into Tuesday night will be stronger overall and the resulting thunderstorms that develop will be quite intense,” AccuWeather Senior Meteorologist Matt Rinde said.

On Monday, strong thunderstorms occurred throughout the northern Illinois area and the NWS received 14 tornado reports in Illinois.

There was one report of a tornado spotted by police officers near Blake Road and Richmond Road in McHenry around 4:48 p.m. Monday, the NWS said.

Periodic thunderstorms are expected through at least Thursday. Warm and very humid conditions will also persist through Thursday.

Heat indices of over 100 are expected in most areas during the Tuesday afternoon hours, with dangerous heat index values nearing or possibly surpassing 105.

The NWS said those who hear thunder are recommended to move indoors, have multiple ways to receive weather warnings and stay tuned to the latest forecast updates.