A tornado watch was issued Monday afternoon through 10 p.m. for Cook County and several other counties in northeastern and north-central Illinois and parts of northwest Indiana.

       The Illinois counties include Boone, Bureau, Cook, DeKalb, DuPage Grundy, Kane, Kankakee, Kendall, Lake, La Salle, Lee, McHenry, Ogle, Putnam, Will and Winnebago.

       The Indiana counties include Jasper, Lake, Newton and Porter.

       The tornado watch comes on the eve of the one-year anniversary of a rare derecho that spawned tornadoes in Chicago’s Rogers Park neighborhood, and before the watch was issued, the day had already been eventful weatherwise.

       Some 4 to 5 inches of rain fell in Chicago’s far northwest suburbs Monday, causing “minor flooding” in ditches and low-lying areas in McHenry and Boone counties, forecasters said.

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       Meteorologists earlier in the day had said there was potential for severe storms and flash flooding along with small hail and gusty winds, but the storm was expected to move through Monday night and dissipate over Lake Michigan, according to the National Weather Service.

       “We’re keeping an eye on an area of developing cumulus clouds and showers in northwest Illinois and southern Wisconsin, which will likely become the main focus for the development of any stronger thunderstorms later (Monday) afternoon and evening,” according to the agency’s website Monday afternoon.

       Closer to the city, rain and thunderstorms were expected to mix in with heat and humidity in the Chicago area later this week, forecasters said.

       Monday had a forecast high of 83 degrees, and Chicagoans were warned of muggy weather in between morning and late afternoon thunderstorms, according to Kevin Donofrio, a meteorologist with the weather service.

       A high of 91 degrees Tuesday may end up feeling more like 102 with the heat index, according to the weather service’s forecast. There is also a 20% chance of rain and thunderstorms after 1 p.m. and a 60% chance of precipitation at night, according to meteorologists.

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       Wednesday also is expected to be hot and potentially wet, with a high of 90 degrees and a 40% chance of rain and thunderstorms during the day and a 30% chance at night. Much of the same was expected Thursday, when there’s a 40% chance of thunderstorms after 1 p.m. The day should otherwise be sunny, with a high of 90 degrees, according to the weather service.

       “For people outdoors, we’re kind of in this pattern when we’re going to have breaks, then we’re going to have storms at times, so it’s good ... to have your eye to the sky. Our motto here is: ‘When thunder roars, go indoors,’” Donofrio said.

       The heat, humidity, and rain are expected to break Friday, making for a dry weekend, with projected high temperatures below 80 degrees.

       Meteorologists also planned to host a talk Tuesday to commemorate and discuss the Aug. 10, 2020 derecho that spurred dayslong power outages throughout the area and spurred a confirmed 11 tornadoes in northern Illinois. Forecasters said the talk, which would be live on social media, may be postponed, depending on the availability of meteorologists.

       For more on the forecast, visit the Tribune’s weather page.

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