Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 5, NWS Milwaukee, WI

July 29, 2021Jefferson County, Waukesha County, Wisconsin

NWS Milwaukee, WI issued this tornado warning at Jul 29, 2021, 1:08 AM CDT for Jefferson County, Waukesha County, Wisconsin. It was in force for 37 min. 14 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, 1:08 AM CDT (06:08 UTC)
Expired: Jul 29, 2021, 1:45 AM CDT
In force: 37 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Jefferson County, WI, Waukesha County, WI

The radar

The Milwaukee radar (KMKX), 16 km from the middle of the area, began a volume at 06:07 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, 1:10 AM CDT	TSTM WND DMG	2 N Sullivan, WI	TREES DAMAGE AND TREES DOWN ON HIGHWAY F AND E FROM SULLIVAN TO CONCORD. TIME ESTIMATED FROM RADAR.
Jul 29, 1:10 AM CDT	TORNADO	4 E Johnson Creek, WI	NWS STORM SURVEY HAS CONFIRMED AN EF-0 TORNADO NORTH OF FARMINGTON. THIS TORNADO PRODUCED A NARROW PATH OF DAMAGE BEGINNING NORTH OF I-94 ALONG SAUCER DR. AND ENDING JUST SOUTH OF I-94. PATH LENGTH IS ESTIMATED TO BE 0.7 MILES LONG WITH PEAK WIND SPEED AROUND
Jul 29, 1:12 AM CDT	TSTM WND GST 70	Johnson Creek, WI	NWS EMPLOYEE ESTIMATED WIND GUST OF 70 MPH.
Jul 29, 1:13 AM CDT	TSTM WND DMG	4 N Sullivan, WI	POWER POLES DOWN ACROSS HIGHWAY F. DEBRIS FROM HOUSES AND OTHER STRUCTURES COVERING ROADWAY. TIME ESTIMATED FROM RADAR.
Jul 29, 1:15 AM CDT	TSTM WND DMG	4 Sse Pipersville, WI	REPORT OF MULTIPLE HOMES AND BUILDINGS DAMAGED ALONG COUNTY RD E JUST NORTH OF I-94 IN CONCORD.
Jul 29, 1:15 AM CDT	TORNADO	4 Sse Pipersville, WI	...EDITED TO INCLUDE PATH LENGTH EXTENDED INTO WAUKESHA COUNTY...NWS STORM SURVEY HAS CONFIRMED A TORNADO STARTING BETWEEN WATERTOWN AND CONCORD, WITH WIDESPREAD DAMAGE IN THE CONCORD AREA. THE PATH EXTENDS SOUTHEAST INTO WAUKESHA COUNTY, ENDING NORTH OF DOUSM
Jul 29, 1:15 AM CDT	TORNADO	4 Sse Pipersville, WI	NWS STORM SURVEY HAS CONFIRMED A TORNADO NEAR CONCORD WI DURING THE EARLY MORNING HOURS OF JULY 29, 2021. THE TORNADO HAS A PRELIMINARY DAMAGE RATING OF EF1. PATH LENGTH AND OTHER DETAILS ARE STILL TBD.
Jul 29, 1:16 AM CDT	TSTM WND DMG	1 N Oconomowoc, WI	TREES SNAPPED NEAR THEIR BASE IN DOWNTOWN OCONOMOWOC. TIME ESTIMATED FROM RADAR.
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, 1:32 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.

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, 6.1 hours before the alert went out and 174 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.

524 
WFUS53 KMKX 290608
TORMKX
WIC055-133-290645-
/O.NEW.KMKX.TO.W.0005.210729T0608Z-210729T0645Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Milwaukee/Sullivan WI
108 AM CDT Thu Jul 29 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Tornado Warning for...
  Western Waukesha County in southeastern Wisconsin...
  Jefferson County in southeastern Wisconsin...

* Until 145 AM CDT.
    
* At 107 AM CDT, severe thunderstorms capable of producing a tornado
  were located along a line extending from near Watertown to near
  Johnson Creek to Jefferson, moving east at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* Locations impacted include...
  Watertown, Whitewater, Fort Atkinson, Hartland, Jefferson,
  Delafield, Lake Mills, Wales, Okauchee Lake, Oconomowoc, Ottawa,
  Merton, Johnson Creek, Dousman, North Prairie, Palmyra, Lac La
  Belle, Lake Ripley, Lake Koshkonong and Ixonia.

This includes the following Locations Pewaukee Lake, Ottawa Lake
Recreation Area, and Pinewoods Campground.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This line of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4285 8901 4301 8901 4320 8878 4318 8824
      4284 8845
TIME...MOT...LOC 0607Z 283DEG 43KT 4317 8866 4311 8870 4303 8881 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

WAGNER

2 follow-up statements

914 
WWUS53 KMKX 290614
SVSMKX

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

WIC055-133-290645-
/O.CON.KMKX.TO.W.0005.000000T0000Z-210729T0645Z/
Waukesha WI-Jefferson WI-
114 AM CDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 AM CDT FOR WESTERN
WAUKESHA AND JEFFERSON COUNTIES...
        
At 113 AM CDT, tornado producing storms were located along a line
extending from near Lac La Belle to 6 miles east of Johnson Creek to
near Jefferson, moving east at 50 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado south-southwest of Watertown.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Watertown, Whitewater, Fort Atkinson, Hartland, Jefferson, Delafield,
Lake Mills, Wales, Okauchee Lake, Oconomowoc, Ottawa, Merton, Johnson
Creek, Dousman, North Prairie, Palmyra, Lac La Belle, Lake Ripley,
Lake Koshkonong and Ixonia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

This line of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4285 8901 4301 8901 4320 8878 4318 8824
      4284 8845
TIME...MOT...LOC 0613Z 270DEG 43KT 4316 8861 4310 8865 4302 8876 

TORNADO...OBSERVED
HAIL...<.75IN

$$

WAGNER

310 
WWUS53 KMKX 290621
SVSMKX

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

WIC055-133-290645-
/O.CON.KMKX.TO.W.0005.000000T0000Z-210729T0645Z/
Waukesha WI-Jefferson WI-
121 AM CDT Thu Jul 29 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 AM CDT FOR WESTERN
WAUKESHA AND JEFFERSON COUNTIES...
        
At 120 AM CDT, tornado producing storms were located along a line
extending from Lac La Belle to near Oconomowoc to near Jefferson,
moving east at 50 mph.

HAZARD...Damaging tornado.

SOURCE...Multiple radar confirmed tornado in eastern Jefferson 
         County.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Watertown, Whitewater, Fort Atkinson, Hartland, Jefferson, Delafield,
Lake Mills, Wales, Okauchee Lake, Oconomowoc, Ottawa, Merton, Johnson
Creek, Dousman, North Prairie, Palmyra, Lac La Belle, Lake Ripley,
Lake Koshkonong and Ixonia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

This line of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4285 8901 4301 8901 4320 8878 4318 8824
      4284 8845
TIME...MOT...LOC 0620Z 270DEG 43KT 4315 8855 4309 8859 4301 8870 

TORNADO...OBSERVED
HAIL...<.75IN

$$

WAGNER

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, 1:17 AM CDT	Severe Thunderstorm Warning	MKX	Dane, Jefferson, Kenosha, Milwaukee, Racine, Rock and 2 more	67 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

Tornado Warnings in Wisconsin, 2021 Every tornado warning in 2021 Tornadoes 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.