Low pressure moving into western Iowa late Monday night will bring an increasing chance for thunderstorms Tuesday afternoon and evening over central and northern Illinois. A warm front will lift towards northern Illinois Tuesday morning and early afternoon as low pressure moves into eastern Iowa. Instability will remain greatest south of the warm front, which now looks to remain just south of the Stateline.
A Marginal Risk for severe thunderstorms is in place over northern Illinois, with a Slight Risk south of I-88. North of the warm front, strong thunderstorms capable of producing hail and heavy rain will be possible. This includes northern Illinois and southern Wisconsin. But south of the warm front thunderstorms will be capable of all modes of severe weather, including isolated tornadoes.
The threat for storms will decrease Tuesday evening with the passage of a cold front. A weak ridge of high moves in Wednesday and Thursday. By Thursday night a warm front will lift northeast through northern Illinois and southern Wisconsin. This will bring a chance for thunderstorms Friday morning, with heat returning for the upcoming weekend.
Temperatures Friday, Saturday and Sunday will
rise into the 90's, but with the dew point temperature expected to warm into the 70's, the heat index could rise over 100 degrees for the last weekend of June.
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