Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 69, NWS Milwaukee, WI

September 7, 20215 counties in Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at Sep 7, 2021, 11:04 AM CDT for 5 counties in Wisconsin. It was in force for 56 min. 2 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, 11:04 AM CDT (16:04 UTC)
Expired: Sep 7, 2021, 12:00 PM CDT
In force: 56 min
Issued by: NWS Milwaukee, WI
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Dodge County, WI, Fond du Lac County, WI, Ozaukee County, WI, Sheboygan County, WI, Washington County, WI

The radar

The Milwaukee radar (KMKX), 64 km from the middle of the area, began a volume at 16:06 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
Sep 7, 11:07 AM CDT	HAIL 1	Juneau, WI	NICKEL TO QUARTER SIZE HAIL.
Sep 7, 11:22 AM CDT	HAIL 1	Allenton, WI	SHERIFFS OFFICE REPORTED QUARTER SIZE HAIL IN ALLENTON.

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, 4.1 hours before the alert went out and 115 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: 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.

232 
WUUS53 KMKX 071604
SVRMKX
WIC027-039-089-117-131-071700-
/O.NEW.KMKX.SV.W.0069.210907T1604Z-210907T1700Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Milwaukee/Sullivan WI
1104 AM CDT Tue Sep 7 2021

The National Weather Service in Milwaukee/Sullivan has issued a

* Severe Thunderstorm Warning for...
  Ozaukee County in southeastern Wisconsin...
  Southeastern Fond du Lac County in east central Wisconsin...
  Washington County in southeastern Wisconsin...
  Central Dodge County in southeastern Wisconsin...
  Southwestern Sheboygan County in east central Wisconsin...

* Until noon CDT.

* At 1102 AM CDT, a severe thunderstorm was located over Horicon,
  moving east at 70 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  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...
  West Bend, Beaver Dam, Hartford, Grafton, Cedarburg, Waupun, Port
  Washington, Jackson, Mayville, Slinger, Saukville, Kewaskum,
  Horicon, Juneau, Lomira, Belgium, Fredonia, Cedar Grove,
  Campbellsport and Random Lake.

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 4345 8781 4338 8787 4330 8789 4329 8790
      4332 8842 4334 8900 4363 8881 4363 8842
      4357 8779 4354 8780 4349 8779
TIME...MOT...LOC 1602Z 266DEG 59KT 4345 8865 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

WOOD

2 follow-up statements

832 
WWUS53 KMKX 071626
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1126 AM CDT Tue Sep 7 2021

WIC027-039-089-117-131-071700-
/O.CON.KMKX.SV.W.0069.000000T0000Z-210907T1700Z/
Ozaukee WI-Fond du Lac WI-Washington WI-Dodge WI-Sheboygan WI-
1126 AM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
OZAUKEE...SOUTHEASTERN FOND DU LAC...WASHINGTON...EAST CENTRAL DODGE
AND SOUTHWESTERN SHEBOYGAN COUNTIES...

At 1126 AM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Sheboygan to near West Bend, moving
east at 75 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

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...
West Bend, Hartford, Grafton, Cedarburg, Port Washington, Jackson,
Mayville, Slinger, Saukville, Kewaskum, Horicon, Juneau, Lomira,
Belgium, Fredonia, Cedar Grove, Campbellsport, Random Lake, Theresa
and Newburg.

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 4345 8781 4338 8787 4330 8789 4329 8790
      4332 8842 4334 8885 4363 8837 4357 8779
      4354 8780 4349 8779
TIME...MOT...LOC 1626Z 260DEG 67KT 4372 8760 4338 8822 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

WOOD

547 
WWUS53 KMKX 071639
SVSMKX

Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
1139 AM CDT Tue Sep 7 2021

WIC039-071646-
/O.CAN.KMKX.SV.W.0069.000000T0000Z-210907T1700Z/
Fond du Lac WI-
1139 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
southeastern and east central Wisconsin.

LAT...LON 4338 8787 4329 8790 4332 8842 4333 8867
      4347 8848 4352 8833 4354 8816 4360 8812
      4357 8779 4354 8780 4349 8779
TIME...MOT...LOC 1636Z 266DEG 59KT 4373 8738 4339 8801 

$$

WIC027-089-117-131-071700-
/O.CON.KMKX.SV.W.0069.000000T0000Z-210907T1700Z/
Ozaukee WI-Washington WI-Dodge WI-Sheboygan WI-
1139 AM CDT Tue Sep 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL NOON CDT FOR
OZAUKEE...WASHINGTON...EAST CENTRAL DODGE AND SOUTHWESTERN SHEBOYGAN
COUNTIES...

At 1136 AM CDT, severe thunderstorms were located along a line
extending from 17 miles east of Sheboygan to near Saukville, moving 
east at 70 mph. At 1130 AM CDT...law enforcement reported quarter 
size hail near Allenton.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Law enforcement.

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...
West Bend, Hartford, Grafton, Cedarburg, Port Washington, Jackson,
Slinger, Saukville, Kewaskum, Belgium, Fredonia, Cedar Grove, Random
Lake, Newburg, Hustisford, Iron Ridge, Addison, Rubicon, Woodland and
Wayne.

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 4338 8787 4329 8790 4332 8842 4333 8867
      4347 8848 4352 8833 4354 8816 4360 8812
      4357 8779 4354 8780 4349 8779
TIME...MOT...LOC 1636Z 266DEG 59KT 4373 8738 4339 8801 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 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.

Issued	Product	Office	Counties	Lasted
Sep 6, 9:06 PM CDT	Small Craft Advisory	MKX		45 hr
Sep 7, 2:21 AM CDT	Gale Warning	MKX		13 hr
Sep 7, 8:41 AM CDT	Special Weather Statement	MKX	Marquette	49 min
Sep 7, 8:57 AM CDT	Severe Thunderstorm Warning	MKX	Green Lake, Marquette	48 min
Sep 7, 9:34 AM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac	56 min
Sep 7, 10:10 AM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac	50 min
Sep 7, 10:27 AM CDT	Severe Thunderstorm Warning	MKX	Fond du Lac, Sheboygan	78 min
Sep 7, 10:40 AM CDT	Special Weather Statement	MKX	Columbia, Dane, Dodge, Iowa	65 min
Sep 7, 10:57 AM CDT	Special Marine Warning	MKX		63 min
Sep 7, 11:01 AM CDT	Severe Thunderstorm Warning	MKX	Columbia, Dane, Dodge, Jefferson	59 min
Sep 7, 11:11 AM CDT	Severe Thunderstorm Warning	MKX	Green, Rock	34 min
Sep 7, 11:22 AM CDT	Special Marine Warning	MKX		53 min
Sep 7, 11:27 AM CDT	Severe Thunderstorm Warning	MKX	Milwaukee, Ozaukee, Washington, Waukesha	48 min
Sep 7, 11:31 AM CDT	Special Marine Warning	MKX		89 min
Sep 7, 11:42 AM CDT	Severe Thunderstorm Warning	MKX	Rock, Walworth	48 min
Sep 7, 11:45 AM CDT	Severe Thunderstorm Warning	MKX	Jefferson, Milwaukee, Waukesha	60 min
Sep 7, 12:18 PM CDT	Special Marine Warning	MKX		87 min
Sep 7, 12:19 PM CDT	Severe Thunderstorm Warning	MKX	Racine, Walworth	40 min
Sep 7, 12:30 PM CDT	Severe Thunderstorm Warning	MKX	Kenosha, Racine, Rock, Walworth	60 min
Sep 7, 12:47 PM CDT	Special Weather Statement	MKX	Milwaukee	28 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.