Alert archive / Wisconsin / Tornado Warnings in 2021
Tornado Warning 10, NWS Green Bay, WI
NWS Green Bay, WI issued this tornado warning at Aug 11, 2021, 2:07 PM CDT for Brown County, Oconto County, Shawano County, Wisconsin. It was in force for 23 min. 3 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, 2:07 PM CDT (19:07 UTC)
- Expired
- Aug 11, 2021, 2:30 PM CDT
- In force
- 23 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
Counties Brown County, WI, Oconto County, WI, Shawano County, WI
The radar
The Green Bay radar (KGRB), 22 km from the middle of the area, began a volume at 19:11 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, 2:12 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, 7.1 hours before the alert went out and 24 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.
- 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
The text
As transmitted.
730
WFUS53 KGRB 111907
TORGRB
WIC009-083-115-111945-
/O.NEW.KGRB.TO.W.0010.210811T1907Z-210811T1945Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
207 PM CDT Wed Aug 11 2021
The National Weather Service in Green Bay has issued a
* Tornado Warning for...
Northwestern Brown County in northeastern Wisconsin...
South central Oconto County in northeastern Wisconsin...
Eastern Shawano County in northeastern Wisconsin...
* Until 245 PM CDT.
* At 207 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Pulaski, or 14 miles southeast of Shawano, moving
east at 30 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
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 dangerous storm will be near...
Pulaski around 220 PM CDT.
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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4461 8836 4466 8842 4478 8815 4465 8807
TIME...MOT...LOC 1907Z 250DEG 24KT 4466 8834
TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
$$
Cooley3 follow-up statements
988
WWUS53 KGRB 111911
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
211 PM CDT Wed Aug 11 2021
WIC009-083-115-111945-
/O.CON.KGRB.TO.W.0010.000000T0000Z-210811T1945Z/
Brown WI-Oconto WI-Shawano WI-
211 PM CDT Wed Aug 11 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM CDT FOR
NORTHWESTERN BROWN...SOUTH CENTRAL OCONTO AND EASTERN SHAWANO
COUNTIES...
At 210 PM CDT, a confirmed tornado was located near Pulaski, or 15
miles southeast of Shawano, moving east at 30 mph. Spotters reported
a brief tornado touchdown near Angelica.
HAZARD...Damaging tornado.
SOURCE...Weather spotters confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornado will be near...
Pulaski around 220 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4461 8836 4466 8842 4478 8815 4465 8807
TIME...MOT...LOC 1910Z 250DEG 24KT 4467 8832
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
Cooley421
WWUS53 KGRB 111917
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
217 PM CDT Wed Aug 11 2021
WIC115-111926-
/O.CAN.KGRB.TO.W.0010.000000T0000Z-210811T1945Z/
Shawano WI-
217 PM CDT Wed Aug 11 2021
...THE TORNADO WARNING FOR EASTERN SHAWANO COUNTY IS CANCELLED...
The tornadic 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 4466 8824 4466 8825 4468 8825 4468 8824
4473 8825 4478 8815 4465 8807 4464 8824
TIME...MOT...LOC 1916Z 250DEG 24KT 4468 8827
$$
WIC009-083-111945-
/O.CON.KGRB.TO.W.0010.000000T0000Z-210811T1945Z/
Brown WI-Oconto WI-
217 PM CDT Wed Aug 11 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 245 PM CDT FOR
NORTHWESTERN BROWN AND SOUTH CENTRAL OCONTO COUNTIES...
At 216 PM CDT, a confirmed tornado was located near Pulaski, or 16
miles east of Shawano, moving east at 30 mph. The tornado was
confirmed near the intersection of Highway 160 and Green Valley Road.
HAZARD...Damaging tornado.
SOURCE...Law enforcement confirmed tornado.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
This tornadic thunderstorm will remain over mainly rural areas of
northwestern Brown and south central Oconto Counties, including the
following locations... South Chase, Chase, Sampson and Flintville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
To repeat, a tornado is on the ground. TAKE COVER NOW! Move to a
basement or an interior room on the lowest floor of a sturdy
building. Avoid windows. If you are outdoors, in a mobile home, or in
a vehicle, move to the closest substantial shelter and protect
yourself from flying debris.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4466 8824 4466 8825 4468 8825 4468 8824
4473 8825 4478 8815 4465 8807 4464 8824
TIME...MOT...LOC 1916Z 250DEG 24KT 4468 8827
TORNADO...OBSERVED
MAX HAIL SIZE...<.75 IN
$$
Cooley682
WWUS53 KGRB 111930
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
230 PM CDT Wed Aug 11 2021
WIC009-083-111939-
/O.CAN.KGRB.TO.W.0010.000000T0000Z-210811T1945Z/
Brown WI-Oconto WI-
230 PM CDT Wed Aug 11 2021
...THE TORNADO WARNING FOR NORTHWESTERN BROWN AND SOUTH CENTRAL
OCONTO COUNTIES IS CANCELLED...
The storm which prompted the warning has weakened and no longer
appears capable of producing a tornado. Therefore, the warning has
been cancelled.
A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Green Bay.
Remember, a Severe Thunderstorm Warning still remains in effect for
northwestern portions of Brown County and south central Oconto
County!
LAT...LON 4466 8824 4466 8825 4468 8825 4468 8824
4473 8825 4478 8815 4465 8807 4464 8824
TIME...MOT...LOC 1927Z 250DEG 24KT 4471 8815
$$
CooleyThe 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, 2:09 PM CDT | Tornado Warning | 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 | 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
Tornado Warnings in Wisconsin, 2021Every tornado warning in 2021Tornadoes 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.