Tuesday, July 11, 2017

Thunderstorms Quickly Developing Tuesday Evening

1:10am Update: New Severe Thunderstorm Warning for Jo Daviess, Stephenson and Carroll counties until 2am.  The thunderstorm was located near Galena and moving east at 20-30 mph.  This storm has had a history of producing wind damage in/around Dubuque, IA earlier.  Seek shelter if in the path of this storm

A NEW Flash Flood Warning has been issued for Walworth County in Wisconsin until 3:15am.  A Severe Thunderstorm Warning has been extended for Jo Daviess County until 1:45am.

A Flash Flood Warning has been issued for McHenry County until 4:45am.  Please remember to never drive across a flooded roadway, especially at night.

All other Severe Thunderstorm Warnings have been allowed to expire.

Severe Thunderstorm Warning cancelled for Green County, continues for Rock County until 11pm.

Severe Thunderstorm Warning for Green and Rock counties until 11pm.  Storm located near Brooklyn will be capable of producing quarter sized hail.  Storm is currently moving east at 35 mph.

8:55pm Update: High rainfall rates are possible with the storms moving into southwest Wisconsin, and this could cause flash flooding over southern Wisconsin and far northern Illinois.  Rainfall rates nearly two inches per hour are possible with the developing storms.

Thunderstorms have quickly developed over northeast Iowa Tuesday evening with hail being the greatest threat at this moment.  Current wind motion in the atmosphere will push these storms into southwest Wisconsin.  There is the possibility for further southward development of the line into northern Illinois in/around 10pm.  As the storms continue to move east strong winds and large hail are likely, but there is also a low end tornado threat through the evening.  This would most likely remain over Wisconsin.

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