Chicago Forecast

Another Round of Severe Storms Moves In Day After Tornadoes Hit Chicago Area

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After severe weather brought several tornadoes to the Chicago area Monday, the threat for severe weather returned Tuesday afternoon with the threat of more tornadoes possible.

A severe thunderstorm watch was issued for DeKalb, LaSalle, Cook, DuPage, Kane, Kendall, Lake, Grundy, McHenry and Will counties in Illinois until 10 p.m. A severe thunderstorm warning was also issued for LaSalle and southern DeKalb counties until 7:15 p.m. and western McHenry and northern DeKalb counties until 7:30 p.m.

Kenosha County in Wisconsin was under a warning until 7:45 p.m.

The National Weather Service warned of storms in those areas capable of producing 70 mph wind gusts and quarter-sized hail.

An “enhanced” risk of severe weather, the third of five ascending categories of severity, exists in many locations across northern Illinois, including McHenry, Lake, DeKalb, Kane, DuPage, Cook and Kendall counties, along with parts of LaSalle and Will counties, according to the NOAA.

Video from Ryan Mallon shows a tornado that moved through Sycamore, Illinois - one of several tornadoes to touch down across the area Monday.

A “slight” risk of severe weather, the second of the five categories, is possible elsewhere in the viewing area, including Will, Grundy, Kankakee, Lake, Porter, LaPorte, Newton and Jasper counties.

Storms could potentially fire in the late afternoon or early evening hours. These storms may produce isolated tornadoes, damaging winds to 70 mph, large hail, torrential downpours and lightning.

The stormy weather will be coupled with soaring temperatures that could send heat indices well above 100 degrees.

A heat advisory goes into effect Tuesday for northern Illinois and parts of northwest Indiana beginning at 12 p.m. CDT and lasting through 7 p.m., according to the National Weather Service.

High temperatures are expected to reach into the low-90s, but heat indices will rise into the triple digits, with some locations potentially seeing readings in excess of 105 degrees.

The NWS is warning residents to "drink plenty of fluids, stay in an air-conditioned room, stay out of the sun and check up on relatives and neighbors."

A reported tornado tore through Sycamore Monday evening, leaving a number of residents without power and tearing roofs of some buildings. NBC 5's Natalie Martinez reports.

Numerous municipalities throughout Cook County will open cooling centers for residents looking to get out of the heat, according to a press release.

The heat and humidity will likely continue Wednesday and Thursday, with the chance of thunderstorms existing through the remainder of the week, according to current forecast models.

High temperatures are expected to remain around the 90-degree mark, paving the way for more oppressive heat indices, especially on Wednesday.

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