Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 81, NWS Green Bay, WI

August 11, 2021Outagamie County, Shawano County, Waupaca County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 11, 2021, 3:08 PM CDT for Outagamie County, Shawano County, Waupaca County, Wisconsin. It was in force for 38 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: Aug 11, 2021, 3:08 PM CDT (20:08 UTC)
Expired: Aug 11, 2021, 3:46 PM CDT
In force: 38 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Outagamie County, WI, Shawano County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 32 km from the middle of the area, began a volume at 20:09 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, 3:10 PM CDT	HAIL 1	Clintonville, WI	DELAYED REPORT
Aug 11, 3:10 PM CDT	HAIL 1	Clintonville, WI	DELAYED REPORT.

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
Aug 11, 12:17 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.1 hours before the alert went out and 34 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.

097 
WUUS53 KGRB 112008
SVRGRB
WIC087-115-135-112100-
/O.NEW.KGRB.SV.W.0081.210811T2008Z-210811T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
308 PM CDT Wed Aug 11 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Northeastern Waupaca County in northeastern Wisconsin...
  Northern Outagamie County in northeastern Wisconsin...
  Eastern Shawano County in northeastern Wisconsin...

* Until 400 PM CDT.

* At 308 PM CDT, a severe thunderstorm was located near Clintonville,
  or 18 miles southwest of Shawano, moving east at 30 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...
  Navarino Wildlife Area and Black Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

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

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter such as an interior room, a
bathroom, closet or basement.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

&&

LAT...LON 4443 8902 4466 8894 4467 8825 4466 8824
      4459 8824 4459 8819 4444 8819
TIME...MOT...LOC 2008Z 270DEG 27KT 4454 8877 

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

$$

Kieckbusch

3 follow-up statements

364 
WWUS53 KGRB 112019
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
319 PM CDT Wed Aug 11 2021

WIC087-115-135-112100-
/O.CON.KGRB.SV.W.0081.000000T0000Z-210811T2100Z/
Waupaca WI-Outagamie WI-Shawano WI-
319 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR NORTHEASTERN WAUPACA...NORTHERN OUTAGAMIE AND EASTERN SHAWANO
COUNTIES...

At 318 PM CDT, a severe thunderstorm was located near Navarino 
Wildlife Area, or 13 miles south of Shawano, moving east at 60 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Clintonville, Pulaski, Black Creek, Embarrass, Navarino Wildlife
Area, Oneida, Pittsfield, Angelica, Shiocton and Bear Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4443 8890 4466 8879 4467 8825 4466 8824
      4459 8824 4459 8819 4444 8819
TIME...MOT...LOC 2018Z 272DEG 64KT 4458 8855 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Kieckbusch

278 
WWUS53 KGRB 112027
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
327 PM CDT Wed Aug 11 2021

WIC135-112036-
/O.CAN.KGRB.SV.W.0081.000000T0000Z-210811T2100Z/
Waupaca WI-
327 PM CDT Wed Aug 11 2021

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

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

LAT...LON 4445 8874 4459 8866 4459 8861 4466 8860
      4467 8825 4466 8824 4459 8824 4459 8819
      4444 8819 4444 8873
TIME...MOT...LOC 2026Z 272DEG 64KT 4457 8836 

$$

WIC087-115-112100-
/O.CON.KGRB.SV.W.0081.000000T0000Z-210811T2100Z/
Outagamie WI-Shawano WI-
327 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR NORTHERN OUTAGAMIE AND EASTERN SHAWANO COUNTIES...

At 326 PM CDT, a severe thunderstorm was located 7 miles northeast 
of Black Creek, or 17 miles southeast of Shawano, moving east at 70 
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...
Pulaski, Black Creek, Navarino Wildlife Area, Oneida, Pittsfield,
Angelica, Shiocton, Navarino, Nichols and Leeman.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4445 8874 4459 8866 4459 8861 4466 8860
      4467 8825 4466 8824 4459 8824 4459 8819
      4444 8819 4444 8873
TIME...MOT...LOC 2026Z 272DEG 64KT 4457 8836 

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

$$

Kieckbusch

807 
WWUS53 KGRB 112046
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
346 PM CDT Wed Aug 11 2021

WIC087-115-112056-
/O.CAN.KGRB.SV.W.0081.000000T0000Z-210811T2100Z/
Outagamie WI-Shawano WI-
346 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN OUTAGAMIE AND EASTERN
SHAWANO COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

LAT...LON 4445 8874 4459 8866 4459 8861 4466 8860
      4467 8825 4466 8824 4459 8824 4459 8819
      4444 8819 4444 8873
TIME...MOT...LOC 2045Z 270DEG 27KT 4457 8814 

$$

Kieckbusch

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:00 PM CDT	Special Marine Warning	GRB		60 min
Aug 10, 7:06 PM CDT	Special Marine Warning	GRB		54 min
Aug 10, 7:11 PM CDT	Flash Flood Warning	GRB	Brown	3 hr
Aug 10, 7:20 PM CDT	Special Weather Statement	GRB	Calumet, Manitowoc	55 min
Aug 10, 7:30 PM CDT	Special Weather Statement	GRB	Door, Marinette	60 min
Aug 10, 7:49 PM CDT	Special Marine Warning	GRB		86 min
Aug 10, 7:52 PM CDT	Severe Thunderstorm Warning	GRB	Calumet, Kewaunee, Manitowoc	38 min
Aug 10, 7:54 PM CDT	Tornado Warning	GRB	Marinette	25 min
Aug 10, 10:05 PM CDT	Areal Flood Advisory	GRB	Brown	70 min
Aug 11, 3:11 AM CDT	Small Craft Advisory	GRB		19 hr
Aug 11, 11:25 AM CDT	Special Weather Statement	GRB	Oneida	65 min
Aug 11, 11:54 AM CDT	Special Weather Statement	GRB	Lincoln, Marathon, Portage, Wood	51 min
Aug 11, 12:18 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	42 min
Aug 11, 12:30 PM CDT	Special Weather Statement	GRB	Marathon	45 min
Aug 11, 12:38 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	52 min
Aug 11, 12:42 PM CDT	Special Weather Statement	GRB	Florence, Forest	33 min
Aug 11, 12:53 PM CDT	Severe Thunderstorm Warning	GRB	Florence, Forest, Marinette	37 min
Aug 11, 12:57 PM CDT	Tornado Warning	GRB	Langlade, Lincoln, Marathon	33 min
Aug 11, 1:04 PM CDT	Tornado Warning	GRB	Marathon	41 min
Aug 11, 1:14 PM CDT	Special Weather Statement	GRB	Shawano	46 min
Aug 11, 1:20 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln, Marathon, Menominee, Shawano	40 min
Aug 11, 1:24 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Menominee, Portage, Shawano, Waupaca	51 min
Aug 11, 1:31 PM CDT	Severe Thunderstorm Warning	GRB	Oconto, Shawano, Waupaca	44 min
Aug 11, 1:40 PM CDT	Tornado Warning	GRB	Marathon	20 min
Aug 11, 1:54 PM CDT	Areal Flood Advisory	GRB	Marathon, Menominee, Shawano	3 hr
Aug 11, 1:54 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Wood	51 min
Aug 11, 2:07 PM CDT	Tornado Warning	GRB	Brown, Oconto, Shawano	23 min
Aug 11, 2:09 PM CDT	Tornado Warning Tornado observed	GRB	Marathon	51 min
Aug 11, 2:16 PM CDT	Flash Flood Warning	GRB	Marathon	5 hr
Aug 11, 2:25 PM CDT	Special Marine Warning	GRB		65 min
Aug 11, 2:27 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Oconto	35 min
Aug 11, 2:37 PM CDT	Areal Flood Advisory	GRB	Marinette, Oconto	2 hr
Aug 11, 2:46 PM CDT	Special Marine Warning	GRB		59 min
Aug 11, 2:47 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	43 min
Aug 11, 2:47 PM CDT	Tornado Warning	GRB	Marathon	43 min
Aug 11, 2:51 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee	39 min
Aug 11, 2:55 PM CDT	Areal Flood Advisory	GRB	Door	2 hr
Aug 11, 2:58 PM CDT	Special Weather Statement	GRB	Waupaca	47 min
Aug 11, 3:07 PM CDT	Flash Flood Warning	GRB	Marathon	4 hr
Aug 11, 3:11 PM CDT	Special Marine Warning	GRB		64 min
Aug 11, 3:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	GRB	Waushara	18 min
Aug 11, 3:30 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee, Oconto, Outagamie, Shawano	60 min
Aug 11, 3:33 PM CDT	Special Marine Warning	GRB		57 min
Aug 11, 3:51 PM CDT	Special Weather Statement	GRB	Outagamie, Winnebago	39 min
Aug 11, 4:05 PM CDT	Special Marine Warning	GRB		55 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.