Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 19, NWS Milwaukee, WI

July 29, 20218 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 29, 2021, 1:17 AM CDT for 8 counties in Wisconsin. It was in force for 67 min. 15 reports 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: Jul 29, 2021, 1:17 AM CDT (06:17 UTC)
Expired: Jul 29, 2021, 2:24 AM CDT
In force: 67 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

Counties Dane County, WI, Jefferson County, WI, Kenosha County, WI, Milwaukee County, WI, Racine County, WI, Rock County, WI, Walworth County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 23 km from the middle of the area, began a volume at 06:19 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
Jul 29, 1:18 AM CDT	TSTM WND DMG	4 N Sullivan, WI	BUSINESS BUILDING DAMAGE.
Jul 29, 1:20 AM CDT	TORNADO	3 Sw Dousman, WI	NWS STORM SURVEY FOUND EF1 RATED TORNADO DAMAGE SOUTH OF DOUSMAN, STARTING NEAR A CEMETERY ON HIGHWAY Z. THE TORNADO PATH WAS 2.19 MILES LONG WITH A WITH OF 100 YDS. PEAK WIND 100 MPH.
Jul 29, 1:22 AM CDT	TSTM WND DMG	1 Wsw Dousman, WI	NUMEROUS BRANCHES AND A FEW TREES BLOCKING PORTIONS OF HARDSCRABBLE RD AND HWY Z NEAR DOUSMAN. TIME ESTIMATED BY RADAR.
Jul 29, 1:24 AM CDT	TSTM WND DMG	2 E Sullivan, WI	MULTIPLE VERY LARGE TREES BROKEN AND DOWNED.
Jul 29, 1:30 AM CDT	TSTM WND GST 60	2 N Oconomowoc, WI	NWS EMPLOYEE ESTIMATED WINDS TO 60 MPH.
Jul 29, 1:30 AM CDT	TORNADO	4 Ese Wales, WI	CORRECTS PREVIOUS TORNADO REPORT FROM 4 ESE WALES. NWS STORM SURVEY HAS CONFIRMED A TORNADO WITH A PRELIMINARY DAMAGE RATING OF EF0 WSW OF WAUKESHA, OR ESE OF WALES IN WAUKESHA COUNTY. DAMAGE IS CONCENTRATED IN THE AREA OF HWY D AND TOWNLINE RD. PATH LENGTH AN
Jul 29, 1:30 AM CDT	TORNADO	4 Ese Wales, WI	NWS STORM SURVEY HAS CONFIRMED A TORNADO WITH A PRELIMINARY DAMAGE RATING OF EF0 WSE OF WAUKESHA, OR ESE OF WALES IN WAUKESHA COUNTY. DAMAGE IS CONCENTRATED IN THE AREA OF HWY D AND TOWNLINE RD. PATH LENGTH AND OTHER DETAILS TBD.
Jul 29, 1:32 AM CDT	TSTM WND DMG	3 E Wales, WI	REPORTS OF MULTIPLE TREES SNAPPED AND LAYING IN THE ROADWAY OFF ROAD DT AND HIGHWAY 18. TIME ESTIMATED FROM RADAR.
Jul 29, 1:32 AM CDT	TORNADO	2 Ene Wales, WI	NWS STORM SURVEY HAS CONFIRMED AN EF-0 TORNADO EAST OF THE VILLAGE OF WALES. THIS TORNADO PRODUCED AN AREA OF TREE DAMAGE BEGINNING NORTH OF HIGHWAY 18 AND ENDING AROUND ROAD DT. PATH LENGTH IS ESTIMATED TO BE 2.4 MILES LONG WITH PEAK WIND SPEED AROUND 85 MPH.
Jul 29, 1:34 AM CDT	TSTM WND DMG	Pewaukee, WI	MULTIPLE TREES AND LARGE BRANCHES DOWN. TIME ESTIMATED FROM RADAR.
Jul 29, 1:40 AM CDT	TSTM WND DMG	1 S Mukwonago, WI	TREE LIMBS DOWN, TRANSFORMER EXPLODED BEHIND VILLAGE OF MUKWONAGO POLICE DEPARTMENT.
Jul 29, 1:40 AM CDT	TORNADO	4 Ese Wales, WI	...UPDATED TO EF1 RATING AND TO INCLUDE PATH LENGTH INFO...NWS STORM SURVEY HAS CONFIRMED A TORNADO WITH A PRELIMINARY DAMAGE RATING OF EF1 WSW OF WAUKESHA, OR ESE OF WALES IN WAUKESHA COUNTY. DAMAGE STRETCHES FROM HWY D AND TOWNLINE RD SOUTH OF HWY 18. PATH L
Jul 29, 1:41 AM CDT	TSTM WND GST 68	5 Ese Footville, WI
Jul 29, 2:14 AM CDT	TSTM WND DMG	1 Ssw Kenosha, WI	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 SSW KENOSHA. LARGE BRANCHES DOWN IN SOUTHERN KENOSHA. TIME ESTIMATED FROM RADAR.
Jul 29, 2:14 AM CDT	TSTM WND DMG	1 Ssw Kenosha, WI	LARGE BRANCHES DOWN IN SOUTHERN KENOSHA. TIME ESTIMATED FROM RADAR.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 28, 7:17 PM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 6.3 hours before the alert went out and 179 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: 593 J/kg
Mixed-layer CIN: -264 J/kg
Mixed-layer LCL: 1088 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

453 
WUUS53 KMKX 290617
SVRMKX
WIC025-055-059-079-101-105-127-133-290745-
/O.NEW.KMKX.SV.W.0019.210729T0617Z-210729T0745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
117 AM CDT Thu Jul 29 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Milwaukee County in southeastern Wisconsin...
  Walworth County in southeastern Wisconsin...
  Rock County in south central Wisconsin...
  Racine County in southeastern Wisconsin...
  Waukesha County in southeastern Wisconsin...
  Southeastern Dane County in south central Wisconsin...
  Jefferson County in southeastern Wisconsin...
  Kenosha County in southeastern Wisconsin...

* Until 245 AM CDT.

* At 116 AM CDT, severe thunderstorms were located along a line
  extending from Slinger to near Jefferson to near Brooklyn, moving
  southeast at 45 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Trained weather spotter estimated 70 mph winds in Johnson 
           Creek .

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Milwaukee, Kenosha, Racine, Waukesha, Janesville, West Allis,
  Wauwatosa, New Berlin, Brookfield, Beloit, Greenfield, Menomonee
  Falls, Oak Creek, Mount Pleasant, Muskego, South Milwaukee,
  Pleasant Prairie, Cudahy, Whitewater and Whitefish Bay.

People attending The Waukesha Kennel Club Dog Show, The Rock County
4H Fair in Janesville, and The Racine County Fair in Union Grove
should seek safe shelter immediately!

This includes the following Locations Milwaukee County Sports
Complex, Milkman Stadium, Bayshore Shopping Center, Southridge Mall,
Boerner Botanical Gardens, General Mitchell International Airport,
Timmerman Airport, Froedert & the Medical College, Fiserv Forum,
Mayfair Mall, Pewaukee Lake, Ottawa Lake Recreation Area, and
Pinewoods Campground.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4250 8937 4287 8937 4304 8879 4320 8860
      4319 8789 4313 8790 4307 8787 4302 8790
      4296 8785 4285 8783 4278 8775 4261 8782
      4249 8780
TIME...MOT...LOC 0616Z 317DEG 39KT 4332 8830 4298 8872 4284 8932 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

HANSEN

3 follow-up statements

744 
WWUS53 KMKX 290632
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
132 AM CDT Thu Jul 29 2021

WIC025-055-059-079-101-105-127-133-290745-
/O.CON.KMKX.SV.W.0019.000000T0000Z-210729T0745Z/
Milwaukee WI-Walworth WI-Rock WI-Racine WI-Waukesha WI-Dane WI-
Jefferson WI-Kenosha WI-
132 AM CDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR MILWAUKEE...WALWORTH...ROCK...RACINE...WAUKESHA...SOUTHEASTERN
DANE...JEFFERSON AND KENOSHA COUNTIES...

At 131 AM CDT, severe thunderstorms were located along a line
extending from near Germantown to Palmyra to near Footville, moving
southeast at 45 mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotter reports winds of 60 mph in 
         Oconomowoc.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Milwaukee, Kenosha, Racine, Waukesha, Janesville, West Allis,
Wauwatosa, New Berlin, Brookfield, Beloit, Greenfield, Menomonee
Falls, Oak Creek, Mount Pleasant, Muskego, South Milwaukee, Pleasant
Prairie, Cudahy, Whitewater and Whitefish Bay.

People attending The Waukesha Kennel Club Dog Show, The Rock County
4H Fair in Janesville, and The Racine County Fair in Union Grove
should seek safe shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4250 8937 4287 8937 4304 8879 4320 8860
      4319 8789 4313 8790 4307 8787 4302 8790
      4296 8785 4285 8783 4278 8775 4261 8782
      4249 8780
TIME...MOT...LOC 0631Z 317DEG 39KT 4321 8816 4287 8858 4273 8918 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

HANSEN

772 
WWUS53 KMKX 290657
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
157 AM CDT Thu Jul 29 2021

WIC025-055-290706-
/O.CAN.KMKX.SV.W.0019.000000T0000Z-210729T0745Z/
Dane WI-Jefferson WI-
157 AM CDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DANE AND
JEFFERSON COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
south central and southeastern Wisconsin.

LAT...LON 4250 8937 4285 8937 4284 8855 4319 8830
      4319 8789 4313 8790 4307 8787 4302 8790
      4296 8785 4285 8783 4278 8775 4261 8782
      4249 8780
TIME...MOT...LOC 0656Z 270DEG 39KT 4304 8790 4270 8832 4256 8892 

$$

WIC059-079-101-105-127-133-290745-
/O.CON.KMKX.SV.W.0019.000000T0000Z-210729T0745Z/
Milwaukee WI-Walworth WI-Rock WI-Racine WI-Waukesha WI-Kenosha WI-
157 AM CDT Thu Jul 29 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR MILWAUKEE...WALWORTH...ROCK...RACINE...WAUKESHA AND KENOSHA
COUNTIES...

At 156 AM CDT, severe thunderstorms were located along a line
extending from Milwaukee to near Browns Lake to near Clinton, moving
east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Milwaukee, Kenosha, Racine, Waukesha, Janesville, West Allis,
Wauwatosa, New Berlin, Brookfield, Beloit, Greenfield, Menomonee
Falls, Oak Creek, Mount Pleasant, Muskego, South Milwaukee, Pleasant
Prairie, Cudahy, Whitewater and Whitefish Bay.

People attending The Waukesha Kennel Club Dog Show, The Rock County
4H Fair in Janesville, and The Racine County Fair in Union Grove
should seek safe shelter immediately!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4250 8937 4285 8937 4284 8855 4319 8830
      4319 8789 4313 8790 4307 8787 4302 8790
      4296 8785 4285 8783 4278 8775 4261 8782
      4249 8780
TIME...MOT...LOC 0656Z 270DEG 39KT 4304 8790 4270 8832 4256 8892 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

HANSEN

751 
WWUS53 KMKX 290724
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
224 AM CDT Thu Jul 29 2021

WIC059-079-101-105-127-133-290734-
/O.CAN.KMKX.SV.W.0019.000000T0000Z-210729T0745Z/
Milwaukee WI-Walworth WI-Rock WI-Racine WI-Waukesha WI-Kenosha WI-
224 AM CDT Thu Jul 29 2021

...THE SEVERE THUNDERSTORM WARNING FOR MILWAUKEE...WALWORTH...ROCK...
RACINE...WAUKESHA AND KENOSHA COUNTIES IS CANCELLED...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning has been cancelled.  However gusty winds are
still possible.

LAT...LON 4250 8937 4285 8937 4284 8855 4319 8830
      4319 8789 4313 8790 4307 8787 4302 8790
      4296 8785 4285 8783 4278 8775 4261 8782
      4249 8780
TIME...MOT...LOC 0720Z 317DEG 39KT 4284 8765 4250 8807 4236 8867 

$$

HANSEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 11:18 PM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac, Green Lake, Marquette	72 min
Jul 28, 11:41 PM CDT	Tornado Warning	MKX	Fond du Lac	20 min
Jul 28, 11:48 PM CDT	Special Weather Statement	MKX	Sauk	42 min
Jul 28, 11:55 PM CDT	Severe Thunderstorm Warning	MKX	Dodge, Washington	65 min
Jul 29, 12:22 AM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Sauk	53 min
Jul 29, 12:26 AM CDT	Tornado Warning	MKX	Columbia, Dodge	31 min
Jul 29, 12:43 AM CDT	Tornado Warning	MKX	Columbia, Dane, Dodge, Jefferson	32 min
Jul 29, 12:45 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Jefferson	45 min
Jul 29, 12:51 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Iowa, Sauk	39 min
Jul 29, 12:57 AM CDT	Severe Thunderstorm Warning	MKX	Dodge, Washington	48 min
Jul 29, 1:07 AM CDT	Severe Thunderstorm Warning	MKX	Green, Lafayette	38 min
Jul 29, 1:08 AM CDT	Tornado Warning	MKX	Jefferson, Waukesha	37 min
Jul 29, 1:24 AM CDT	Special Marine Warning	MKX		96 min
Jul 29, 1:31 AM CDT	Tornado Warning	MKX	Milwaukee, Racine, Walworth, Waukesha	44 min
Jul 29, 1:36 AM CDT	Tornado Warning	MKX	Rock	24 min
Jul 29, 1:51 AM CDT	Special Weather Statement	MKX	Green, Lafayette	24 min
Jul 29, 4:06 AM CDT	Small Craft Advisory	MKX		33 hr
Jul 29, 2:02 PM CDT	Beach Hazards Statement	MKX	Kenosha, Milwaukee, Ozaukee, Racine, Sheboygan	29 hr

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.