Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Milwaukee, WI

September 7, 2021Fond du Lac County, Sheboygan County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 7, 2021, 10:27 AM CDT for Fond du Lac County, Sheboygan County, Wisconsin. It was in force for 78 min. 5 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
Sep 7, 2021, 10:27 AM CDT (15:27 UTC)
Expired
Sep 7, 2021, 11:45 AM CDT
In force
78 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Fond du Lac County, WI, Sheboygan County, WI

The radar

The Green Bay radar (KGRB), 80 km from the middle of the area, began a volume at 15:26 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

TimeReportWhereRemark
Sep 7, 10:37 AM CDTHAIL 0.88Fond Du Lac, WI
Sep 7, 10:39 AM CDTHAIL 1.53 S Fond Du Lac, WISPOTTER REPORTED PING PONG BALL SIZE HAIL NEAR THE INTERSECTION OF.
Sep 7, 10:42 AM CDTHAIL 12 Sse Fond Du Lac, WI
Sep 7, 10:45 AM CDTHAIL 1.75Fond Du Lac, WI
Sep 7, 11:12 AM CDTHAIL 12 N Kohler, WI

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, 3.5 hours before the alert went out and 78 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2021-09-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 14 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2021-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -120 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
14 J/kg
Mixed-layer CIN
-216 J/kg
Mixed-layer LCL
1012 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
-120 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.1

Open this sounding in Storm Lab

The text

As transmitted.

695 
WUUS53 KMKX 071527
SVRMKX
WIC039-117-071645-
/O.NEW.KMKX.SV.W.0067.210907T1527Z-210907T1645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1027 AM CDT Tue Sep 7 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Eastern Fond du Lac County in east central Wisconsin...
  Sheboygan County in east central Wisconsin...

* Until 1145 AM CDT.

* At 1026 AM CDT, severe thunderstorms were located along a line
  extending from near St Anna to 6 miles east of Fond Du Lac to near
  Oakfield, moving east at 35 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Sheboygan, Fond Du Lac, Plymouth, Sheboygan Falls, North Fond Du
  Lac, Howards Grove, Oostburg, Kohler, Cedar Grove, Elkhart Lake,
  Southern Lake Winnebago, Taycheedah, Lamartine, Greenbush, Eden,
  Mount Calvary, Cascade, Adell, Waldo and St. Cloud.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4357 8779 4363 8840 4374 8861 4380 8857
      4389 8846 4389 8840 4394 8840 4394 8817
      4389 8816 4389 8774 4379 8772 4379 8773
      4376 8770 4372 8771 4368 8770
TIME...MOT...LOC 1526Z 271DEG 32KT 4391 8805 4380 8831 4373 8864 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

WOOD
3 follow-up statements
529 
WWUS53 KMKX 071547
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1047 AM CDT Tue Sep 7 2021

WIC039-117-071645-
/O.CON.KMKX.SV.W.0067.000000T0000Z-210907T1645Z/
Fond du Lac WI-Sheboygan WI-
1047 AM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT
FOR EASTERN FOND DU LAC AND SHEBOYGAN COUNTIES...

At 1046 AM CDT, severe thunderstorms were located along a line
extending from near Cleveland to near Elkhart Lake to near Fond Du 
Lac, moving east at 35 mph. Golf ball size hail was reported on the 
south side of Fond du Lac at 1045 AM CDT.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Public.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Sheboygan, Fond Du Lac, Plymouth, Sheboygan Falls, North Fond Du Lac,
Howards Grove, Oostburg, Kohler, Cedar Grove, Elkhart Lake, Southern
Lake Winnebago, Taycheedah, Lamartine, Greenbush, Eden, Mount
Calvary, Cascade, Adell, Waldo and St. Cloud.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

&&

LAT...LON 4357 8779 4363 8840 4374 8861 4381 8848
      4386 8833 4389 8816 4389 8774 4379 8772
      4379 8773 4376 8770 4372 8771 4368 8770
TIME...MOT...LOC 1546Z 271DEG 32KT 4391 8782 4380 8808 4373 8841 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

WOOD
261 
WWUS53 KMKX 071616
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1116 AM CDT Tue Sep 7 2021

WIC039-117-071645-
/O.CON.KMKX.SV.W.0067.000000T0000Z-210907T1645Z/
Fond du Lac WI-Sheboygan WI-
1116 AM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT
FOR SOUTHEASTERN FOND DU LAC AND SHEBOYGAN COUNTIES...

At 1116 AM CDT, severe thunderstorms were located along a line
extending from 20 miles southeast of Cleveland to 6 miles southeast
of Sheboygan to near Random Lake, moving east at 55 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Sheboygan, Plymouth, Sheboygan Falls, Howards Grove, Oostburg,
Kohler, Cedar Grove, Elkhart Lake, Greenbush, Cascade, Adell, Waldo,
St. Cloud, Glenbeulah, Haven, Johnsonville, Dundee, Waucousta,
Gibbsville and Town of Forest.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 4357 8779 4363 8840 4389 8816 4389 8774
      4379 8772 4379 8773 4376 8770 4372 8771
      4368 8770
TIME...MOT...LOC 1616Z 276DEG 46KT 4380 8738 4369 8764 4360 8791 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

WOOD
814 
WWUS53 KMKX 071633
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1133 AM CDT Tue Sep 7 2021

WIC039-071643-
/O.CAN.KMKX.SV.W.0067.000000T0000Z-210907T1645Z/
Fond du Lac WI-
1133 AM CDT Tue Sep 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FOND DU LAC
COUNTY 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 600 PM CDT for
east central Wisconsin.

LAT...LON 4360 8812 4380 8794 4379 8772 4376 8770
      4374 8771 4370 8771 4368 8770 4357 8779
TIME...MOT...LOC 1633Z 271DEG 32KT 4380 8718 4369 8744 4360 8771 

$$

WIC117-071645-
/O.CON.KMKX.SV.W.0067.000000T0000Z-210907T1645Z/
Sheboygan WI-
1133 AM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT
FOR CENTRAL SHEBOYGAN COUNTY...

At 1133 AM CDT, severe thunderstorms were located along a line
extending from 29 miles east of Cleveland to 15 miles east of
Sheboygan to near Oostburg, moving east at 35 mph.

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

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Sheboygan, Plymouth, Sheboygan Falls, Oostburg, Kohler, Cedar Grove,
Cascade, Adell, Waldo, Johnsonville, Gibbsville, Batavia and Hingham.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.

&&

LAT...LON 4360 8812 4380 8794 4379 8772 4376 8770
      4374 8771 4370 8771 4368 8770 4357 8779
TIME...MOT...LOC 1633Z 271DEG 32KT 4380 8718 4369 8744 4360 8771 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

WOOD

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 6, 9:06 PM CDTSmall Craft AdvisoryMKX45 hr
Sep 7, 2:21 AM CDTGale WarningMKX13 hr
Sep 7, 8:41 AM CDTSpecial Weather StatementMKXMarquette49 min
Sep 7, 8:57 AM CDTSevere Thunderstorm WarningMKXGreen Lake, Marquette48 min
Sep 7, 9:34 AM CDTSevere Thunderstorm WarningMKXFond du Lac56 min
Sep 7, 10:10 AM CDTSevere Thunderstorm WarningMKXFond du Lac50 min
Sep 7, 10:40 AM CDTSpecial Weather StatementMKXColumbia, Dane, Dodge, Iowa65 min
Sep 7, 10:57 AM CDTSpecial Marine WarningMKX63 min
Sep 7, 11:01 AM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Dodge, Jefferson59 min
Sep 7, 11:04 AM CDTSevere Thunderstorm WarningMKXDodge, Fond du Lac, Ozaukee, Sheboygan, Washington56 min
Sep 7, 11:11 AM CDTSevere Thunderstorm WarningMKXGreen, Rock34 min
Sep 7, 11:22 AM CDTSpecial Marine WarningMKX53 min
Sep 7, 11:27 AM CDTSevere Thunderstorm WarningMKXMilwaukee, Ozaukee, Washington, Waukesha48 min
Sep 7, 11:31 AM CDTSpecial Marine WarningMKX89 min
Sep 7, 11:42 AM CDTSevere Thunderstorm WarningMKXRock, Walworth48 min
Sep 7, 11:45 AM CDTSevere Thunderstorm WarningMKXJefferson, Milwaukee, Waukesha60 min
Sep 7, 12:18 PM CDTSpecial Marine WarningMKX87 min
Sep 7, 12:19 PM CDTSevere Thunderstorm WarningMKXRacine, Walworth40 min
Sep 7, 12:30 PM CDTSevere Thunderstorm WarningMKXKenosha, Racine, Rock, Walworth60 min
Sep 7, 12:47 PM CDTSpecial Weather StatementMKXMilwaukee28 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021Every 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.