Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 55, NWS Milwaukee, WI

August 11, 2021Kenosha County, Racine County, Walworth County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 11, 2021, 6:24 PM CDT for Kenosha County, Racine County, Walworth County, Wisconsin. It was in force for 53 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 11, 2021, 6:24 PM CDT (23:24 UTC)
Expired: Aug 11, 2021, 7:17 PM CDT
In force: 53 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kenosha County, WI, Racine County, WI, Walworth County, WI

The radar

The Milwaukee radar (KMKX), 61 km from the middle of the area, began a volume at 23:25 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Aug 11, 6:45 PM CDT	TSTM WND DMG	2 Ne Eagle Lake, WI	MULTIPLE TREES AND A POWER LINE DOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.4 hours before the alert went out and 201 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1499 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

414 
WUUS53 KMKX 112324
SVRMKX
WIC059-101-127-120030-
/O.NEW.KMKX.SV.W.0055.210811T2324Z-210812T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
624 PM CDT Wed Aug 11 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  East central Walworth County in southeastern Wisconsin...
  Racine County in southeastern Wisconsin...
  Northern Kenosha County in southeastern Wisconsin...

* Until 730 PM CDT.

* At 624 PM CDT, a severe thunderstorm was located near Elkhorn,
  moving east at 40 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Kenosha, Racine, Mount Pleasant, Pleasant Prairie, Elkhorn,
  Delavan, Lake Geneva, Sturtevant, Union Grove, Paddock Lake,
  Williams Bay, Rochester, Wheatland, Yorkville, Wind Point, Browns
  Lake, Como, Eagle Lake, Bohners Lake and Caledonia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4276 8777 4270 8777 4267 8779 4267 8781
      4265 8781 4261 8782 4259 8781 4255 8781
      4258 8864 4273 8864 4280 8776 4278 8775
TIME...MOT...LOC 2324Z 265DEG 36KT 4267 8847 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

4 follow-up statements

223 
WWUS53 KMKX 112344
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
644 PM CDT Wed Aug 11 2021

WIC127-112353-
/O.CAN.KMKX.SV.W.0055.000000T0000Z-210812T0030Z/
Walworth WI-
644 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WALWORTH COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the area. Therefore, the warning has been cancelled.

LAT...LON 4276 8777 4270 8777 4267 8779 4267 8781
      4261 8782 4259 8781 4255 8781 4257 8831
      4276 8831 4280 8777 4278 8775
TIME...MOT...LOC 2343Z 265DEG 36KT 4269 8821 

$$

WIC059-101-120030-
/O.CON.KMKX.SV.W.0055.000000T0000Z-210812T0030Z/
Racine WI-Kenosha WI-
644 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR RACINE AND NORTHERN KENOSHA COUNTIES...

At 643 PM CDT, a severe thunderstorm was located over Browns Lake, or
8 miles west of Union Grove, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Kenosha, Racine, Mount Pleasant, Pleasant Prairie, Sturtevant, Union
Grove, Paddock Lake, Rochester, Wheatland, Yorkville, Wind Point,
Browns Lake, Eagle Lake, Bohners Lake, Caledonia, Burlington,
Waterford, Bristol, Paris and Brighton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4276 8777 4270 8777 4267 8779 4267 8781
      4261 8782 4259 8781 4255 8781 4257 8831
      4276 8831 4280 8777 4278 8775
TIME...MOT...LOC 2343Z 265DEG 36KT 4269 8821 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

101 
WWUS53 KMKX 120003
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
703 PM CDT Wed Aug 11 2021

WIC059-101-120030-
/O.CON.KMKX.SV.W.0055.000000T0000Z-210812T0030Z/
Racine WI-Kenosha WI-
703 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR CENTRAL RACINE AND NORTHEASTERN KENOSHA COUNTIES...

At 703 PM CDT, a severe thunderstorm was located over Sturtevant,
moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Kenosha, Racine, Mount Pleasant, Sturtevant, Union Grove, Paddock
Lake, Yorkville, Wind Point, Eagle Lake, Caledonia, Paris, Brighton,
Somers, Elmwood Park, North Bay, Franksville, Kansasville and North
Cape.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4276 8777 4270 8777 4267 8779 4267 8781
      4261 8782 4259 8781 4255 8781 4257 8818
      4277 8818 4280 8777 4278 8775
TIME...MOT...LOC 0003Z 265DEG 36KT 4271 8794 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

287 
WWUS53 KMKX 120012
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
712 PM CDT Wed Aug 11 2021

WIC059-101-120030-
/O.CON.KMKX.SV.W.0055.000000T0000Z-210812T0030Z/
Racine WI-Kenosha WI-
712 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR EAST CENTRAL RACINE AND NORTHEASTERN KENOSHA COUNTIES...

At 712 PM CDT, a severe thunderstorm was located over Racine, moving
east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Kenosha, Racine, Mount Pleasant, Wind Point, Caledonia, Elmwood Park
and North Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4276 8777 4270 8777 4267 8779 4267 8781
      4261 8782 4261 8787 4279 8787 4280 8777
      4278 8775
TIME...MOT...LOC 0012Z 265DEG 36KT 4272 8781 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CMILLER

609 
WWUS53 KMKX 120017
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
717 PM CDT Wed Aug 11 2021

WIC059-101-120026-
/O.CAN.KMKX.SV.W.0055.000000T0000Z-210812T0030Z/
Racine WI-Kenosha WI-
717 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL RACINE AND
NORTHEASTERN KENOSHA COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds from 
25 to 35 mph are still possible as this thunderstorm exits over Lake 
Michigan.
.

LAT...LON 4276 8777 4270 8777 4267 8779 4267 8781
      4261 8782 4261 8787 4279 8787 4280 8777
      4278 8775
TIME...MOT...LOC 0015Z 265DEG 36KT 4272 8775 

$$

CMILLER

The office that day

Everything else NWS Milwaukee, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 7:05 PM CDT	Special Weather Statement	MKX	Jefferson	25 min
Aug 10, 7:24 PM CDT	Severe Thunderstorm Warning	MKX	Sheboygan	51 min
Aug 10, 7:43 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Milwaukee, Ozaukee, Racine	32 min
Aug 10, 8:07 PM CDT	Special Marine Warning	MKX		53 min
Aug 10, 8:16 PM CDT	Special Marine Warning	MKX		44 min
Aug 11, 6:44 AM CDT	Small Craft Advisory	MKX		15 hr
Aug 11, 9:58 AM CDT	Special Weather Statement	MKX	Kenosha, Milwaukee, Racine, Rock, Walworth	77 min
Aug 11, 10:06 AM CDT	Special Marine Warning	MKX		84 min
Aug 11, 2:46 PM CDT	Severe Thunderstorm Warning	MKX	Green Lake, Marquette	59 min
Aug 11, 4:22 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	53 min
Aug 11, 5:05 PM CDT	Special Weather Statement	MKX	Iowa	25 min
Aug 11, 5:10 PM CDT	Severe Thunderstorm Warning	MKX	Iowa	50 min
Aug 11, 5:24 PM CDT	Special Weather Statement	MKX	Milwaukee	36 min
Aug 11, 5:49 PM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Waukesha	41 min
Aug 11, 5:56 PM CDT	Special Marine Warning	MKX		94 min
Aug 11, 5:58 PM CDT	Special Weather Statement	MKX	Iowa	47 min
Aug 11, 6:04 PM CDT	Tornado Warning	MKX	Iowa	41 min
Aug 11, 6:34 PM CDT	Tornado Warning	MKX	Dane	15 min
Aug 11, 6:48 PM CDT	Special Marine Warning	MKX		57 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.