Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 76, NWS Green Bay, WI

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

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 11, 2021, 1:31 PM CDT for Oconto County, Shawano County, Waupaca County, Wisconsin. It was in force for 44 min. 4 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, 1:31 PM CDT (18:31 UTC)
Expired: Aug 11, 2021, 2:15 PM CDT
In force: 44 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Oconto County, WI, Shawano County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 31 km from the middle of the area, began a volume at 18:34 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, 2:06 PM CDT	TORNADO	Angelica, WI	BRIEF TOUCHDOWN SOUTHWEST OF ANGELICA NEAR HWY 55 AND HWY 160.
Aug 11, 2:12 PM CDT	TORNADO	2 Wnw Pulaski, WI
Aug 11, 2:18 PM CDT	TSTM WND DMG	1 Nnw Pulaski, WI	REPORT FROM MPING: 3-INCH TREE LIMBS BROKEN; POWER POLES BROKEN.
Aug 11, 2:18 PM CDT	TSTM WND DMG	1 N Pulaski, WI	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF.

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, 6.5 hours before the alert went out and 33 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.

563 
WUUS53 KGRB 111831
SVRGRB
WIC083-115-135-111915-
/O.NEW.KGRB.SV.W.0076.210811T1831Z-210811T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
131 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...
  South central Oconto County in northeastern Wisconsin...
  Eastern Shawano County in northeastern Wisconsin...

* Until 215 PM CDT.

* At 130 PM CDT, a severe thunderstorm was located near Embarrass, or
  10 miles south of Shawano, moving east at 50 mph.

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

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Navarino Wildlife Area around 140 PM CDT.

Other locations in the path of this severe thunderstorm include
Pulaski.

PRECAUTIONARY/PREPAREDNESS ACTIONS...


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

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

&&

LAT...LON 4454 8874 4469 8882 4494 8811 4472 8799
      4467 8820 4467 8823 4468 8823 4468 8825
      4466 8825 4459 8854 4459 8873 4455 8874
TIME...MOT...LOC 1830Z 249DEG 42KT 4463 8867 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RDM

3 follow-up statements

202 
WWUS53 KGRB 111847
SVSGRB

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

WIC135-111856-
/O.CAN.KGRB.SV.W.0076.000000T0000Z-210811T1915Z/
Waupaca WI-
147 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 4460 8851 4476 8863 4494 8811 4472 8799
      4467 8820 4467 8823 4468 8823 4468 8825
      4466 8825
TIME...MOT...LOC 1846Z 245DEG 35KT 4470 8846 

$$

WIC083-115-111915-
/O.CON.KGRB.SV.W.0076.000000T0000Z-210811T1915Z/
Oconto WI-Shawano WI-
147 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM CDT
FOR SOUTH CENTRAL OCONTO AND EASTERN SHAWANO COUNTIES...

At 146 PM CDT, a severe thunderstorm was located near Navarino
Wildlife Area, or 8 miles southeast of Shawano, moving northeast at
40 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
  Pulaski.

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.

&&

LAT...LON 4460 8851 4476 8863 4494 8811 4472 8799
      4467 8820 4467 8823 4468 8823 4468 8825
      4466 8825
TIME...MOT...LOC 1846Z 245DEG 35KT 4470 8846 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RDM

567 
WWUS53 KGRB 111905
SVSGRB

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

WIC083-115-111915-
/O.CON.KGRB.SV.W.0076.000000T0000Z-210811T1915Z/
Oconto WI-Shawano WI-
205 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM CDT
FOR SOUTH CENTRAL OCONTO AND EASTERN SHAWANO COUNTIES...

At 204 PM CDT, a severe thunderstorm was located near Pulaski, or 13
miles southeast of Shawano, moving northeast at 35 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Shawano, Pulaski, Chase, Angelica, Bonduel, Morgan, Sampson, Cecil,
Green Valley and Pulcifer.

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.

&&

LAT...LON 4461 8846 4478 8857 4490 8824 4469 8812
      4467 8820 4467 8823 4468 8823 4468 8825
      4466 8825
TIME...MOT...LOC 1904Z 244DEG 31KT 4466 8836 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

RDM

045 
WWUS53 KGRB 111914
SVSGRB

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

WIC083-115-111923-
/O.EXP.KGRB.SV.W.0076.000000T0000Z-210811T1915Z/
Oconto WI-Shawano WI-
214 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL OCONTO AND
EASTERN SHAWANO COUNTIES WILL EXPIRE AT 215 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

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

Remember, a Tornado Warning still remains in effect for southwest 
Oconto county and southeastern Shawano county.

LAT...LON 4461 8846 4478 8857 4490 8824 4469 8812
      4467 8820 4467 8823 4468 8823 4468 8825
      4466 8825
TIME...MOT...LOC 1913Z 249DEG 42KT 4470 8823 

$$

RDM

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, 1:40 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, 3:08 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Shawano, Waupaca	38 min
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.