Chicago Forecast

Severe weather looms over Chicago forecast with risk of heavy downpours, hail, isolated tornadoes

Severe weather chances were in the Chicago area forecast for both Monday and Tuesday

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Muggy, humid conditions, showers and storms and the chance for severe weather were all in the forecast for the Chicago area Monday, the NBC 5 Storm team said.

"It's going to feel a little summery out there," NBC 5 Meteorologist Pete Sack said, of the heat indices Monday.

According to Sack, Monday morning started out with sunshine, though some parts to the north and west could see scattered showers. Temperatures were expected to climb into the low 80s by around 12 p.m. Some parts along the lakefront were expected to remain slightly cooler, Sack added.

Around 12 p.m., the Chicago area will also see chances for showers and thunderstorms, Sack said, as a first round of stormy conditions was expected to pinwheel in.

By around 3 p.m., a second round of storms was set to arrive, lasting through the early evening. In the south suburbs, showers and storms could remain through 9 p.m., Sack said.

Temperatures later Monday afternoon were also expected to climb, reaching into the mid-80s, Sack added.

Severe weather threats and timing

According to the Storm Prediction Center, most of the Chicago area Monday will be at a "slight" risk of severe weather, which ranks as level two of five on the SPC's severe weather scale.

Monday's storms bring chances of damaging winds up to 60 miles per hour, large hail and heavy downpours, Sack said.

"An isolated tornado is not out of the question," Sack added.

According to the National Weather Service, the highest likelihood of severe weather Monday was between 12 p.m. and 8 p.m., and to the north of I-80.

"In addition, thunderstorms will be capable of producing torrential downpours which could lead to some localized flooding, particularly in suburban and urban areas," the NWS said in an alert.

Severe weather Tuesday

While the daytime hours Tuesday were expected to remain dry, severe weather chances were in the forecast for Tuesday evening, Sack said, as another line of storms was expected to move in around 9 p.m. and last through midnight.

"Additional thunderstorms are likely Tuesday evening into Tuesday night," the NWS said. "Some of these storms could become severe with the potential for damaging winds and perhaps brief tornadoes."

According to the NWS, the severe weather threat for Tuesday appeared to be the greatest north and west of the I-39 corridor.

The SPC said much of the Chicago area Tuesday was under a "slight" risk of severe weather, though some portions of DeKalb and LaSalle counties were at an "enhanced" risk, which ranks as level three of five.

According to forecast models, the strongest storms were expected to remain in western Illinois.

Temperature highs Tuesday remain in the mid-80s, Sack said.

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