Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 69, NWS Green Bay, WI

August 10, 2021Brown County, Door County, Kewaunee County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 10, 2021, 6:59 PM CDT for Brown County, Door County, Kewaunee County, Wisconsin. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 10, 2021, 6:59 PM CDT (23:59 UTC)
Expired: Aug 10, 2021, 7:45 PM CDT
In force: 46 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Brown County, WI, Door County, WI, Kewaunee County, WI

The radar

The Green Bay radar (KGRB), 40 km from the middle of the area, began a volume at 00:05 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.

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, 12.0 hours before the alert went out and 40 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.

892 
WUUS53 KGRB 102359
SVRGRB
WIC009-029-061-110045-
/O.NEW.KGRB.SV.W.0069.210810T2359Z-210811T0045Z/

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

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Northeastern Brown County in northeastern Wisconsin...
  Kewaunee County in northeastern Wisconsin...
  Southern Door County in northeastern Wisconsin...

* Until 745 PM CDT.

* At 659 PM CDT, a severe thunderstorm was located near Bay Shore
  Park, 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.

* This severe thunderstorm will be near...
  Bay Shore Park around 705 PM CDT.
  Luxemburg around 715 PM CDT.

Other locations in the path of this severe thunderstorm include
Kewaunee and Algoma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4438 8784 4466 8785 4468 8780 4472 8777
      4475 8730 4470 8730 4454 8741 4438 8746
TIME...MOT...LOC 2359Z 265DEG 28KT 4456 8786 

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

$$

Uhlmann

2 follow-up statements

672 
WWUS53 KGRB 110019
SVSGRB

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

WIC009-110027-
/O.CAN.KGRB.SV.W.0069.000000T0000Z-210811T0045Z/
Brown WI-
719 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BROWN COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled. However, 
additional heavy rainfall will remain a concern as additional 
thunderstorms remain in the area.

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

LAT...LON 4465 8776 4472 8773 4475 8730 4470 8730
      4454 8741 4438 8746 4438 8776
TIME...MOT...LOC 0017Z 265DEG 28KT 4457 8766 

$$

WIC029-061-110045-
/O.CON.KGRB.SV.W.0069.000000T0000Z-210811T0045Z/
Kewaunee WI-Door WI-
719 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR KEWAUNEE AND SOUTHERN DOOR COUNTIES...

At 717 PM CDT, a severe thunderstorm was located near Luxemburg, or 8
miles southeast of Bay Shore Park, moving east at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Kewaunee and Algoma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4465 8776 4472 8773 4475 8730 4470 8730
      4454 8741 4438 8746 4438 8776
TIME...MOT...LOC 0017Z 265DEG 28KT 4457 8766 

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

$$

Uhlmann

991 
WWUS53 KGRB 110039
SVSGRB

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

WIC029-061-110048-
/O.EXP.KGRB.SV.W.0069.000000T0000Z-210811T0045Z/
Kewaunee WI-Door WI-
739 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR KEWAUNEE AND SOUTHERN DOOR
COUNTIES WILL EXPIRE AT 745 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

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

LAT...LON 4465 8776 4472 8773 4475 8730 4470 8730
      4454 8741 4438 8746 4438 8776
TIME...MOT...LOC 0038Z 265DEG 28KT 4458 8743 

$$

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, 6:29 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Outagamie	46 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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.