Severe weather is likely to impact the Chicago area this Monday evening, as a passing cold front triggers unstable atmospheric conditions across northern Illinois and parts of northwestern Indiana.
Throughout the afternoon, scattered storms have already formed, with the National Weather Service issuing a severe thunderstorm warning for LaPorte County, extending into portions of Starke County. One particularly intense cell near La Crosse has been moving southeast at approximately 10 mph, generating wind gusts up to 60 mph (96 km/h) and hail the size of pennies.
More storms are expected to develop through the late afternoon and evening hours, especially south of Interstate 80, although strong cells may also emerge elsewhere across the region. These storms are capable of producing damaging straight-line winds, frequent cloud-to-ground lightning, and intense downpours, which may result in localized flooding, particularly in low-lying or poorly drained areas.
According to the Storm Prediction Center, the Chicago metro area and surrounding counties remain under a marginal risk category for severe weather, with the main threats being gusty winds and heavy rainfall.
Once the front passes, cooler and drier air will settle into the region, with daytime highs on Tuesday and Wednesday returning to the low-to-mid 80s°F (28–29°C) and noticeably lower humidity levels making for more comfortable conditions.
That brief relief, however, is expected to be short-lived. By the Fourth of July holiday weekend, forecast models are already suggesting a return of oppressive heat, with highs climbing into the 90s°F (32–35°C) and heat indices potentially surpassing 100°F (38°C). Additional scattered thunderstorms could move through the area shortly after the holiday, ushering in another cooldown next week as a secondary front makes its way across the Midwest.
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