7:50pm Update: The majority of thunderstorms are done, however, the upper level low is moving into southwest Wisconsin and this has ignited a few showers/storms over NW Illinois and SW Wisconsin. These are not expected to be severe, but could bring heavy rainfall and frequent lightning from time to time.
Severe Thunderstorm Watch has been canceled for all but DeKalb County. Severe threat has decreased significantly Monday evening. There will still be a few lingering showers, and maybe even a rogue thunderstorm, but the severe threat remains very low.
The Severe Thunderstorm Watch has been canceled for Jo Daviess, Stephenson, Carroll and Whiteside counties. Strongest storms now over McHenry and northern DeKalb counties. We've received many reports of pea sized hail with the storms as they moved through the Rockford area. There were a few reports of nickel sized hail as well. Once this lines passes, our storm threat will be decreasing through the night.
A Severe Thunderstorm Watch has been issued for all of northern Illinois and southern Wisconsin until 9pm/10pm Monday evening.
Thunderstorms have developed ahead of an area of low pressure and cold front early Monday afternoon. So far, any of the severe weather has stayed south and east of the immediate area, but thunderstorms forming over NW Illinois have the potential to become severe as they move into a slightly higher unstable air mass over north-central Illinois. Greatest threats are large hail and wind, but there is also a low end tornado threat.
Please make sure you have a way to receive warnings through the afternoon. Any storms that do develop will be out of here after 8pm/9pm.
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