Weather Update Sunday Evening

Severe Thunderstorm Warning canceled for Winnebago, Rock and Walworth counties.

(11:59:12 PM) nwsbot: Local Storm Report by NWS LOT: 4 ENE Pecatonica [Winnebago Co, IL] law enforcement reports TSTM WND DMG at 11:38 PM CDT -- tree and a large branch downed near the same area. time estimated per radar.

Severe Thunderstorm Warning for Rock and Walworth counties until 12:30am.  Strong thunderstorm moving out of Winnebago County and into southeast Rock and Walworth counties will have the potential for strong winds, frequent lightning, small hail and heavy rainfall.  Storm is moving to the northeast around 35 mph.




9:20pm Update: Severe Thunderstorm Warning canceled for Rock County.  Thunderstorms will remain isolated through the overnight.  Warm and muggy with temperatures in the low 70's.

 

 
8:45pm Update: A Severe Thunderstorm Warning has been issued for northwest Rock County in southern Wisconsin until 9:30pm.  The storm was located near Evansville, and moving northeast around 40 mph.  This storm will be capable of 60 mph wind gusts and dime sized hail.  Heads up if in the path of the storm.  Seek shelter inside and away from windows until the storm passes.

Temperatures Sunday afternoon warmed into the upper 80's and low 90's, but the heat index made it feel more like the low 100's in some locations.  A Heat Advisory remains in place for Stephenson, Jo Daviess, Carroll and Whiteside counties through 7pm Monday evening.


Skies over northern Illinois have stayed mostly dry, but thunderstorms quickly developed over central and southern Wisconsin Sunday afternoon.  Numerous severe thunderstorm warnings were issued with reports of wind damage in central Wisconsin.  Most of the storm activity will remain to the north in Wisconsin Sunday evening, but a few isolated thunderstorms may develop further south in northern Illinois.

The return of the heat and humidity has allowed quite a bit of instability to build over northern Illinois, but the warm temperatures have also put a 'lid' on our atmosphere, limiting thunderstorm development.  There are currently a few light showers over central Iowa, with a few thunderstorms over southeast Iowa.  If those storms gain a little more strength over the next hour or two, they could move into northern Illinois between 8pm and 9pm, posing a small wind threat.  Otherwise, thunderstorms over Wisconsin will remain to the north through Sunday night

and Monday morning.  Any storms that do develop would mostly pose a heavy rain threat with secondary threats being wind and hail.