Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Green Bay, WI

August 10, 2021Brown County, Outagamie County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 10, 2021, 6:29 PM CDT for Brown County, Outagamie County, Wisconsin. It was in force for 46 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: Aug 10, 2021, 6:29 PM CDT (23:29 UTC)
Expired: Aug 10, 2021, 7:15 PM CDT
In force: 46 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Brown County, WI, Outagamie County, WI

The radar

The Green Bay radar (KGRB), 7 km from the middle of the area, began a volume at 23:30 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 10, 6:41 PM CDT	HAIL 0.5	4 Wsw Green Bay, WI	REPORTED VIA SOCIAL MEDIA.
Aug 10, 6:49 PM CDT	TSTM WND DMG	1 Se Green Bay, WI	TREES DOWN ON THE EAST SIDE OF GREEN BAY. TIME ESTIMATED BY RADAR. REPORT VIA SOCIAL MEDIA.
Aug 10, 6:51 PM CDT	TSTM WND DMG	3 E Green Bay, WI	REPORT OF A TREE FALLING ON A HOUSE. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Aug 10, 6:51 PM CDT	TSTM WND DMG	3 S Green Bay, WI	MULTIPLE TREES DOWN IN ALLOUEZ AND BELLEVUE. THE TIME OF THIS REPORT IS AN ESTIMATE BASED ON RADAR.
Aug 10, 7:18 PM CDT	TSTM WND DMG	3 E Green Bay, WI	REPORT OF A TREE FALLING ON A HOUSE. REPORT VIA SOCIAL MEDIA.

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 10, 3:47 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.5 hours before the alert went out and 9 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: 32 J/kg
Mixed-layer CIN: -550 J/kg
Mixed-layer LCL: 828 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

533 
WUUS53 KGRB 102329
SVRGRB
WIC009-087-110015-
/O.NEW.KGRB.SV.W.0067.210810T2329Z-210811T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
629 PM CDT Tue Aug 10 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Brown County in northeastern Wisconsin...
  Northeastern Outagamie County in northeastern Wisconsin...

* Until 715 PM CDT.

* At 629 PM CDT, a severe thunderstorm was located 9 miles south of
  Pulaski, or 13 miles west of Green Bay, moving east at 20 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Green Bay, Bellevue Town and Bay Shore Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4443 8844 4459 8828 4459 8824 4463 8823
      4465 8793 4463 8793 4465 8787 4466 8776
      4436 8777
TIME...MOT...LOC 2329Z 268DEG 22KT 4454 8828 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Uhlmann

3 follow-up statements

998 
WWUS53 KGRB 102349
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
649 PM CDT Tue Aug 10 2021

WIC009-087-110015-
/O.CON.KGRB.SV.W.0067.000000T0000Z-210811T0015Z/
Brown WI-Outagamie WI-
649 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR CENTRAL BROWN AND NORTHEASTERN OUTAGAMIE COUNTIES...

At 648 PM CDT, a severe thunderstorm was located near Green Bay, 
moving east at 25 mph. Heavy rainfall and lowered visibility are 
occurring with these storms.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Green Bay, Bay Shore Park, Bellevue Town, Oneida, De Pere, Howard,
Ashwaubenon, Bellevue, Allouez and Suamico.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If you encounter flooded roadways, do not drive through them! Turn 
around, don't drown!

&&

LAT...LON 4442 8835 4459 8822 4463 8808 4465 8793
      4463 8792 4465 8787 4466 8776 4436 8777
TIME...MOT...LOC 2348Z 268DEG 22KT 4454 8812 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Uhlmann

247 
WWUS53 KGRB 110001
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
701 PM CDT Tue Aug 10 2021

WIC087-110010-
/O.CAN.KGRB.SV.W.0067.000000T0000Z-210811T0015Z/
Outagamie WI-
701 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN OUTAGAMIE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
northeastern Wisconsin.

LAT...LON 4438 8797 4449 8801 4462 8803 4465 8793
      4463 8793 4463 8792 4465 8787 4466 8776
      4436 8777
TIME...MOT...LOC 0000Z 268DEG 22KT 4454 8801 

$$

WIC009-110015-
/O.CON.KGRB.SV.W.0067.000000T0000Z-210811T0015Z/
Brown WI-
701 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN BROWN COUNTY...

At 700 PM CDT, a severe thunderstorm was located over Green Bay,
moving east at 30 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Green Bay, Bay Shore Park, Bellevue Town, Bellevue, Allouez,
Humboldt, Glenmore, Langes Corners, Leo Frigo Bridge and Red Banks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4438 8797 4449 8801 4462 8803 4465 8793
      4463 8793 4463 8792 4465 8787 4466 8776
      4436 8777
TIME...MOT...LOC 0000Z 268DEG 22KT 4454 8801 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Uhlmann

027 
WWUS53 KGRB 110008
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
708 PM CDT Tue Aug 10 2021

WIC009-110017-
/O.EXP.KGRB.SV.W.0067.000000T0000Z-210811T0015Z/
Brown WI-
708 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BROWN COUNTY WILL
EXPIRE AT 715 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However heavy 
rain and flooding are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
northeastern Wisconsin.

LAT...LON 4438 8797 4449 8801 4462 8803 4465 8793
      4463 8793 4463 8792 4465 8787 4466 8776
      4436 8777
TIME...MOT...LOC 0007Z 268DEG 22KT 4454 8795 

$$

Uhlmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 7:08 PM CDT	Marine Dense Fog Advisory	GRB		13 hr
Aug 10, 1:36 AM CDT	Dense Fog Advisory	GRB	Florence, Forest, Langlade, Lincoln, Marinette, Menominee and 3 more	6 hr
Aug 10, 12:18 PM CDT	Special Weather Statement	GRB	Vilas	42 min
Aug 10, 12:48 PM CDT	Special Weather Statement	GRB	Vilas	42 min
Aug 10, 1:07 PM CDT	Special Weather Statement	GRB	Vilas	38 min
Aug 10, 5:16 PM CDT	Special Weather Statement	GRB	Outagamie	29 min
Aug 10, 5:46 PM CDT	Special Weather Statement	GRB	Outagamie	44 min
Aug 10, 5:46 PM CDT	Special Weather Statement	GRB	Outagamie	44 min
Aug 10, 6:00 PM CDT	Tornado Warning	GRB	Outagamie, Shawano	30 min
Aug 10, 6:32 PM CDT	Special Marine Warning	GRB		43 min
Aug 10, 6:41 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Oconto	49 min
Aug 10, 6:52 PM CDT	Areal Flood Advisory	GRB	Brown, Kewaunee, Outagamie	3 hr
Aug 10, 6:59 PM CDT	Severe Thunderstorm Warning Considerable damage threat	GRB	Brown, Door, Kewaunee	46 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.