Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 5, NWS Green Bay, WI

August 10, 2021Outagamie County, Shawano County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Aug 10, 2021, 6:00 PM CDT for Outagamie County, Shawano County, Wisconsin. It was in force for 30 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 10, 2021, 6:00 PM CDT (23:00 UTC)
Expired: Aug 10, 2021, 6:30 PM CDT
In force: 30 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Outagamie County, WI, Shawano County, WI

The radar

The Green Bay radar (KGRB), 27 km from the middle of the area, began a volume at 23:00 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, 6:02 PM CDT	TORNADO	2 Sw Nichols, WI	CORRECTS PREVIOUS TORNADO REPORT FROM 2 SW NICHOLS. TORNADO MAY HAVE TOUCHED DOWN EARLIER PENDING STORM DAMAGE SURVEY RESULTS.
Aug 10, 6:02 PM CDT	TORNADO	2 Sw Nichols, WI

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, 11.0 hours before the alert went out and 28 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.

739 
WFUS53 KGRB 102300
TORGRB
WIC087-115-102330-
/O.NEW.KGRB.TO.W.0005.210810T2300Z-210810T2330Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
600 PM CDT Tue Aug 10 2021

The National Weather Service in Green Bay has issued a

* Tornado Warning for...
  Northeastern Outagamie County in northeastern Wisconsin...
  Eastern Shawano County in northeastern Wisconsin...

* Until 630 PM CDT.

* At 600 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Black Creek, or 16 miles south of Shawano, moving
  east at 20 mph.

  HAZARD...Tornado.

  SOURCE...Weather spotters reported funnel cloud.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  northeastern Outagamie and eastern Shawano Counties, including the
  following locations... Nichols, Leeman, Laney, Briarton, Hofa Park,
  Rose Lawn and Oneida.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4451 8855 4458 8856 4459 8849 4466 8827
      4447 8821
TIME...MOT...LOC 2300Z 265DEG 15KT 4454 8852 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Uhlmann

4 follow-up statements

558 
WWUS53 KGRB 102304
SVSGRB

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

WIC087-115-102330-
/O.CON.KGRB.TO.W.0005.000000T0000Z-210810T2330Z/
Outagamie WI-Shawano WI-
604 PM CDT Tue Aug 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR
NORTHEASTERN OUTAGAMIE AND EASTERN SHAWANO COUNTIES...
    
At 603 PM CDT, a confirmed tornado was located near Black Creek, or
16 miles south of Shawano, moving east at 15 mph.

HAZARD...Damaging tornado.

SOURCE...Emergency management confirmed tornado.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Oneida, Nichols, Leeman, Laney, Briarton, Hofa Park and Rose Lawn. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4451 8855 4458 8856 4459 8849 4466 8827
      4447 8821
TIME...MOT...LOC 2303Z 265DEG 15KT 4454 8850 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

Uhlmann

892 
WWUS53 KGRB 102313
SVSGRB

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

WIC087-115-102330-
/O.CON.KGRB.TO.W.0005.000000T0000Z-210810T2330Z/
Outagamie WI-Shawano WI-
613 PM CDT Tue Aug 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR
NORTHEASTERN OUTAGAMIE AND EASTERN SHAWANO COUNTIES...
    
At 612 PM CDT, a confirmed tornado was located near Black Creek, or
17 miles south of Shawano, moving east at 15 mph.

Another circulation is forming on radar, east-southeast of the 
confirmed tornado, approximately four miles south of the town of 
Nichols.

HAZARD...Damaging tornado.

SOURCE...Law enforcement confirmed tornado.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Oneida, Nichols, Laney, Briarton, Hofa Park and Rose Lawn. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4457 8852 4459 8849 4466 8827 4447 8821
      4451 8851
TIME...MOT...LOC 2312Z 270DEG 11KT 4454 8848 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

Uhlmann

537 
WWUS53 KGRB 102322
SVSGRB

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

WIC115-102331-
/O.CAN.KGRB.TO.W.0005.000000T0000Z-210810T2330Z/
Shawano WI-
622 PM CDT Tue Aug 10 2021

...THE TORNADO WARNING FOR EASTERN SHAWANO COUNTY IS CANCELLED...
    
The tornadic thunderstorm which prompted the warning has remained 
out of the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4451 8847 4456 8849 4458 8846 4459 8843
      4459 8825 4447 8821
TIME...MOT...LOC 2321Z 270DEG 11KT 4454 8844 

$$

WIC087-102330-
/O.CON.KGRB.TO.W.0005.000000T0000Z-210810T2330Z/
Outagamie WI-
622 PM CDT Tue Aug 10 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CDT FOR
NORTHEASTERN OUTAGAMIE COUNTY...
    
At 621 PM CDT, a confirmed tornado was located near Black Creek, or
17 miles southeast of Shawano, moving east at 15 mph.

Spotters reported a funnel cloud 2 miles north of Black Creek at 
6:18PM.

HAZARD...Damaging tornado.

SOURCE...Law enforcement confirmed tornado.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Oneida, Nichols, Briarton and Rose Lawn. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.

&&

LAT...LON 4451 8847 4456 8849 4458 8846 4459 8843
      4459 8825 4447 8821
TIME...MOT...LOC 2321Z 270DEG 11KT 4454 8844 

TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN

$$

Uhlmann

878 
WWUS53 KGRB 102330
SVSGRB

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

WIC087-102340-
/O.EXP.KGRB.TO.W.0005.000000T0000Z-210810T2330Z/
Outagamie WI-
630 PM CDT Tue Aug 10 2021

...THE TORNADO WARNING FOR NORTHEASTERN OUTAGAMIE COUNTY HAS
EXPIRED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.

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

LAT...LON 4451 8847 4456 8849 4458 8846 4459 8843
      4459 8825 4447 8821
TIME...MOT...LOC 2330Z 265DEG 15KT 4454 8840 

$$

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, 6:29 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
Aug 10, 6:59 PM CDT	Severe Thunderstorm Warning Considerable damage threat	GRB	Brown, Door, Kewaunee	46 min

Nearby

Tornado Warnings in Wisconsin, 2021 Every tornado warning in 2021 Tornadoes 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.