Thursday, August 10, 2017

Severe Storm Threat Increasing Over Northern Illinois and Southern Wisconsin

10:30pm Update: Cold front is now moving through northern Illinois.  An isolated shower or two can't be ruled out over the next couple of hours, but skies are expected to remain mostly cloudy.  A little more calm for the overnight and into Friday.

6:38pm Update: Severe Thunderstorm Watch cancelled for Green and Rock counties.  The watch is also cancelled for Jo Daviess, Stephenson and Carroll counties in NW Illinois, and for Boone, Ogle and Winnebago counties in north-central Illinois.  It remains in effect for DeKalb, Whiteside, Lee and Walworth counties.

(5:40:52 PM) nwsbot: Local Storm Report by NWS DVN: ESE Erie [Whiteside Co, IL] trained spotter reports HAIL of quarter size (E1.00 INCH) at 05:37 PM CDT -- also wind gusts to 45 mph.

5:32pm Update: Severe Thunderstorm Warning continues for southwestern Whiteside County until 6:15pm.  Wind gusts to 60 mph and quarter sized hail are possible with this storm, currently moving east/southeast.

Outside of this warning, the weather is fairly quiet over northern Illinois and southern Wisconsin.  Right now, it appears as if the highest severe threat may be now located a bit further where a little more instability is located - over west-central Illinois.

(3:54:09 PM) nwsbot: Local Storm Report by NWS MKX: Clinton [Rock Co, WI] public reports HAIL of half inch size (E0.50 INCH) at 03:45 PM CDT --

3:50pm Update: Stronger thunderstorm located near Rockton may be capable of producing nickel sized hail.  Storm is moving east at 20 mph. 

Severe Thunderstorm Warning issued for southern Rock and Walworth counties until 4pm.  Quarter sized hail had been reported with this storm in Beloit, WI.  Storm is moving to the east at 25 mph.  Large hail will be the biggest threat with this storm.  Heads up Sharon and Walworth.

(3:37:23 PM) nwsbot: Local Storm Report by NWS MKX: Beloit [Rock Co, WI] law enforcement reports HAIL of quarter size (E1.00 INCH) at 03:29 PM CDT --

3:00pm Update: New Severe Thunderstorm Warning for Jo Daviess and Stephenson counties until 3:45pm.  Storm located near Stockton is moving east at 35 mph and capable of producing winds in excess of 60 mph and large hail.  Strongest part of the storm located just north of Elizabeth.  Please seek shelter if in the path of this storm.

(2:50:44 PM) nwsbot: Local Storm Report by NWS MKX: Argyle [Lafayette Co, WI] law enforcement reports TSTM WND DMG at 02:18 PM CDT -- power lines down.

2:48pm Update: Severe Thunderstorm Watch issued for all of N. IL and S. WI until 9pm this evening.  Storms will likely be increasing in coverage over the next couple of hours, posing a wind and large hail risk.  It's important to remain 'Weather Ready' this afternoon.  If you're out, make sure you know where the safest place for you to take shelter should severe weather move through.  Especially if you're out at the Boone County Fair.

Storm coverage will be increasing over southern Wisconsin and northern Illinois through 5pm as a cold front moves out of Iowa.  Clearing skies following moderate rainfall Thursday morning have allowed instability to grow through the afternoon.  An upper level and surface low are moving into Wisconsin, pulling the cold front east.  As the front moves into the unstable air mass, thunderstorms will continue to grow.  Large hail will be the greatest threat, followed by wind gusts to 60 mph.  Please remain alert this afternoon, especially if you're outside.  Thunderstorms will move through between 3pm and 9pm.  It's possible that a severe thunderstorm watch will may be issued for parts of the area.

A Severe Thunderstorm Warning has been issued for central Green County until 2:45pm for the possibility of ping pong sized hail and 60 mph wind gusts.  Those in the path of the storm need to take shelter immediately.  The storm is moving east at 35 mph.

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