Wednesday, June 14, 2017

Severe Thunderstorm Watch - Wednesday

6:45pm Update: All Severe Thunderstorm Watches have been allowed to expire for northern Illinois and southern Wisconsin.  Light to moderate rain continues to fall over McHenry, eastern Boone and DeKalb counties.

A Flood Warning has been issued for southern Boone, McHenry and northern DeKalb counties until 11:45pm.  Radar estimates of 2 to 4 inches of rain has occurred in this area.

6:10pm Update: The Severe Thunderstorm Watch has been cancelled for Green, Rock, Stephenson, Jo Daviess, Carroll and Whiteside counties but continues for Winnebago, Boone, McHenry, Ogle, Lee and DeKalb counties until 8pm.

The majority of the severe weather has moved in towards Chicago, but additional thunderstorms are developing back to the west and southwest - with on Severe Thunderstorm Warning for Dubuque County in Northeast Iowa.  We may see isolated thunderstorms through 8pm - especially moving into northwest Illinois.  These storms are forming ahead of the main cold front that will pass through the overnight.

3:40pm Update:  A Flood Advisory has been issued for Northwest DeKalb County until 6:45pm Wednesday evening.  There has been very little movement in thunderstorms over the past hour from Fairdale to just north of Genoa - where very heavy rain has been occurring.  Rainfall estimates of 1" to 2" have occurred. 

These storms are very slow moving with winds in the upper part of the atmosphere very weak.  Additional thunderstorms over west-central Illinois do need watching as those are expected to pull northeast - mostly east of I-39 - before 6pm.  Strong winds would be the primary concern should those storms hold together and make it to the northeast.

Check out how tall these storms are! Approaching 50,00ft! Large hail is possible in these storms.

Severe storm warning for Rock Co until 1:45. 1" hail and 60mph winds possible along with heavy rain. 

A Severe thunderstorm watch is in place for the entire Stateline until 8pm. Heavy rain, large hail, and strong winds are biggest threats. 

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