Chicago braces for severe thunderstorms with large hail, tornado risk and rapid temperature plunge
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Warm air builds before a volatile shift
The Chicago area, Illinois is entering a period of unstable weather as warm air settles in ahead of an approaching cold front. Temperatures rise quickly. The air feels mild.On Wednesday, readings climbed into the 70s under partly cloudy skies. Overnight conditions remain unusually warm, with lows only falling into the low to mid 50s.
The warmth sets the stage. The atmosphere becomes primed.
Enhanced risk of severe storms across the region
By Thursday, conditions shift rapidly. The Storm Prediction Center places much of Chicago, IL and surrounding areas under an enhanced risk of severe weather, a level three out of five.Northern sections, including McHenry County, IL and Lake County, IL, remain under a slight risk.
All hazards are possible:
- large hail
- damaging wind gusts
- isolated tornadoes
Supercell storms bring potential for large hail and tornadoes
Forecast models indicate the potential for supercell development. These storms can grow vertically, producing large hailstones.Hailstones may exceed 2 inches in diameter, with some projections suggesting even larger sizes.
The same storm structures can support tornado formation. The tornado threat remains isolated, but present, particularly south of I-80 in the Chicago, IL region.
Wind damage is also a concern. Gusts may intensify as storms mature.
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Chicago weather severe storms hail tornado risk temperature drop Illinois forecast ThursdayStorms arrive late afternoon with a sharp temperature drop
Storms are expected to develop during the late afternoon and early evening, generally between 3 PM and 9 PM.Initial activity focuses on northern parts of the Chicago area, Illinois before spreading southeastward across suburban regions.
As the cold front advances, temperatures fall quickly.
From highs in the 70s and even near 80°F earlier in the day, readings drop into the 30s and 40s by night.
The shift is abrupt. Noticeable within hours.
For those attending outdoor events, including the Cubs home opener, conditions may change during the event itself, with temperatures falling into the 40s.
Cooler air settles in before weekend recovery
By Friday, the colder air mass settles over the region. Morning temperatures approach freezing.Daytime highs remain in the low to mid 40s across Chicago, IL.
The pattern then shifts again.
Temperatures begin to recover through the weekend:
- around 50°F on Saturday
- near 60°F by Sunday
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