UPDATE: Widely scattered thunderstorms continue to lift to the northeast late Tuesday evening producing mostly heavy rainfall. A few of the stronger cells may be capable of small hail and winds gusting 30-40 mph. These thunderstorms are moving to the northeast well ahead of a cold front still near the Mississippi River. While a low end threat remains for a strong thunderstorm or two, our severe risk continues to decrease.
The cloud cover from earlier in the day is beginning to clear giving us a little more sunshine Tuesday evening. The increase in sunrise has allowed the instability to also increase across northwest Illinois. This is ahead of a slow moving cold front that'll slide through northern Illinois and southern Wisconsin around Midnight.
An uptick in storm coverage is expected over the next few hours, roughly between 7pm and 11pm, with the highest coverage likely south of Rockford across Whiteside, Ogle, Lee and DeKalb counties. With the cold front not passing through until Midnight, the threat for thunderstorms will continue through the evening.
Ahead of the cold front, isolated showers and thunderstorms are expected to develop - and have already started to develop in eastern Iowa and northwest Illinois. These storms have the risk to grow to severe strength, producing damaging winds and hail later Tuesday evening.
An uptick in storm coverage is expected over the next few hours, roughly between 7pm and 11pm, with the highest coverage likely south of Rockford across Whiteside, Ogle, Lee and DeKalb counties. With the cold front not passing through until Midnight, the threat for thunderstorms will continue through the evening.
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