Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 89, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at Aug 27, 2021, 7:55 PM CDT for 4 counties in Wisconsin. It was in force for 65 min. 1 report 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 27, 2021, 7:55 PM CDT (00:55 UTC)
- Expired
- Aug 27, 2021, 9:00 PM CDT
- In force
- 65 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Brown County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI
The radar
The Green Bay radar (KGRB), 11 km from the middle of the area, began a volume at 00:58 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 27, 8:09 PM CDT | TSTM WND GST 39 | Ashwaubenon, WI | MEASURED WIND GUST AT GREEN BAY ASOS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.9 hours before the alert went out and 11 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
- 552 J/kg
- Mixed-layer CIN
- -77 J/kg
- Mixed-layer LCL
- 916 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 278 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.6
The text
As transmitted.
159
WUUS53 KGRB 280055
SVRGRB
WIC009-083-087-115-280200-
/O.NEW.KGRB.SV.W.0089.210828T0055Z-210828T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
755 PM CDT Fri Aug 27 2021
The National Weather Service in Green Bay has issued a
* Severe Thunderstorm Warning for...
Brown County in northeastern Wisconsin...
South central Oconto County in northeastern Wisconsin...
Northeastern Outagamie County in northeastern Wisconsin...
Eastern Shawano County in northeastern Wisconsin...
* Until 900 PM CDT.
* At 755 PM CDT, severe thunderstorms were located along a line
extending from 6 miles northwest of Pulaski to near Black Creek,
moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Pulaski around 800 PM CDT.
Other locations in the path of these severe thunderstorms include
Bellevue Town, Bay Shore Park and Denmark.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4430 8797 4440 8853 4484 8843 4476 8788
4471 8792 4463 8793 4468 8781 4473 8776
4433 8777 4433 8789 4430 8789
TIME...MOT...LOC 0055Z 284DEG 35KT 4475 8829 4445 8835
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurimski5 follow-up statements
449
WWUS53 KGRB 280107
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
807 PM CDT Fri Aug 27 2021
WIC009-083-087-115-280200-
/O.CON.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Brown WI-Oconto WI-Outagamie WI-Shawano WI-
807 PM CDT Fri Aug 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR BROWN...SOUTH CENTRAL OCONTO...NORTHEASTERN OUTAGAMIE AND EASTERN
SHAWANO COUNTIES...
At 807 PM CDT, severe thunderstorms were located along a line
extending from near Pulaski to 6 miles northwest of Green Bay to 8
miles north of Kaukauna, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Green Bay around 810 PM CDT.
Bellevue Town around 815 PM CDT.
Other locations in the path of these severe thunderstorms include Bay
Shore Park and Denmark.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4440 8853 4459 8838 4484 8843 4476 8788
4471 8792 4463 8793 4468 8780 4473 8776
4433 8777 4433 8789 4430 8789 4430 8797
TIME...MOT...LOC 0107Z 278DEG 41KT 4474 8820 4456 8812 4440 8826
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurimski986
WWUS53 KGRB 280121
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
821 PM CDT Fri Aug 27 2021
WIC115-280131-
/O.CAN.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Shawano WI-
821 PM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN SHAWANO COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4437 8836 4457 8817 4463 8824 4481 8825
4476 8788 4471 8792 4463 8793 4468 8780
4473 8776 4433 8777 4433 8789 4430 8789
4430 8797
TIME...MOT...LOC 0121Z 284DEG 35KT 4471 8803 4453 8795 4437 8809
$$
WIC009-083-087-280200-
/O.CON.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Brown WI-Oconto WI-Outagamie WI-
821 PM CDT Fri Aug 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR BROWN...SOUTH CENTRAL OCONTO AND EAST CENTRAL OUTAGAMIE
COUNTIES...
At 821 PM CDT, severe thunderstorms were located along a line
extending from 10 miles east of Pulaski to near Green Bay to 9 miles
southwest of Bellevue Town, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Bellevue Town around 825 PM CDT.
Other locations in the path of these severe thunderstorms include Bay
Shore Park and Denmark.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4437 8836 4457 8817 4463 8824 4481 8825
4476 8788 4471 8792 4463 8793 4468 8780
4473 8776 4433 8777 4433 8789 4430 8789
4430 8797
TIME...MOT...LOC 0121Z 284DEG 35KT 4471 8803 4453 8795 4437 8809
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurimski756
WWUS53 KGRB 280131
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
831 PM CDT Fri Aug 27 2021
WIC087-280141-
/O.CAN.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Outagamie WI-
831 PM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL OUTAGAMIE COUNTY
IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4434 8819 4450 8819 4461 8806 4464 8810
4479 8806 4476 8788 4471 8792 4463 8793
4468 8780 4473 8776 4433 8777 4433 8789
4430 8789 4430 8797
TIME...MOT...LOC 0131Z 272DEG 35KT 4473 8790 4455 8782 4439 8796
$$
WIC009-083-280200-
/O.CON.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Brown WI-Oconto WI-
831 PM CDT Fri Aug 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR BROWN AND SOUTHERN OCONTO COUNTIES...
At 831 PM CDT, severe thunderstorms were located along a line
extending from 8 miles northwest of Bay Shore Park to near Luxemburg
to near Bellevue Town, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe storms will be near...
Bay Shore Park around 835 PM CDT.
Denmark around 840 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4434 8819 4450 8819 4461 8806 4464 8810
4479 8806 4476 8788 4471 8792 4463 8793
4468 8780 4473 8776 4433 8777 4433 8789
4430 8789 4430 8797
TIME...MOT...LOC 0131Z 272DEG 35KT 4473 8790 4455 8782 4439 8796
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurimski598
WWUS53 KGRB 280144
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
844 PM CDT Fri Aug 27 2021
WIC083-280153-
/O.CAN.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Oconto WI-
844 PM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN OCONTO COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4441 8804 4454 8803 4459 8792 4463 8793
4468 8780 4473 8776 4433 8777 4433 8789
TIME...MOT...LOC 0143Z 270DEG 32KT 4475 8777 4457 8769 4441 8783
$$
WIC009-280200-
/O.CON.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Brown WI-
844 PM CDT Fri Aug 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR EASTERN BROWN COUNTY...
At 843 PM CDT, severe thunderstorms were located along a line
extending from 8 miles north of Bay Shore Park to near Luxemburg to
near Denmark, moving east at 35 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
These severe thunderstorms will remain over mainly rural areas of
eastern Brown County, including the following locations... Langes
Corners, Humboldt, Bellevue, Glenmore, Ledgeview, Leo Frigo Bridge,
Red Banks, Bay Settlement, Poland and Champion.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4441 8804 4454 8803 4459 8792 4463 8793
4468 8780 4473 8776 4433 8777 4433 8789
TIME...MOT...LOC 0143Z 270DEG 32KT 4475 8777 4457 8769 4441 8783
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kurimski464
WWUS53 KGRB 280154
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
854 PM CDT Fri Aug 27 2021
WIC009-280204-
/O.EXP.KGRB.SV.W.0089.000000T0000Z-210828T0200Z/
Brown WI-
854 PM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BROWN COUNTY WILL
EXPIRE AT 900 PM CDT...
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will
be allowed to expire.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Green Bay.
LAT...LON 4441 8804 4454 8803 4459 8792 4463 8793
4468 8780 4473 8776 4433 8777 4433 8789
TIME...MOT...LOC 0154Z 284DEG 35KT 4473 8764 4455 8756 4439 8770
$$
KurimskiThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 7:25 PM CDT | Areal Flood Advisory | GRB | Outagamie, Portage, Shawano, Waupaca | 2 hr |
| Aug 27, 7:52 PM CDT | Special Marine Warning | GRB | 68 min | |
| Aug 27, 8:35 PM CDT | Special Weather Statement | GRB | Kewaunee | 40 min |
| Aug 27, 9:08 PM CDT | Special Weather Statement | GRB | Calumet, Winnebago | 52 min |
| Aug 27, 9:53 PM CDT | Areal Flood Advisory | GRB | Marathon, Portage, Waushara, Wood | 3 hr |
| Aug 27, 9:59 PM CDT | Special Weather Statement | GRB | Calumet, Manitowoc | 61 min |
| Aug 27, 10:36 PM CDT | Areal Flood Advisory | GRB | Calumet, Manitowoc | 3 hr |
| Aug 27, 10:39 PM CDT | Areal Flood Advisory | GRB | Outagamie, Shawano, Waupaca, Winnebago | 3 hr |
| Aug 27, 10:58 PM CDT | Flash Flood Warning | GRB | Portage, Wood | 3 hr |
| Aug 27, 11:32 PM CDT | Special Weather Statement | GRB | Oconto, Waushara | 58 min |
| Aug 27, 11:51 PM CDT | Flash Flood Warning | GRB | Waupaca | 3 hr |
| Aug 28, 12:34 AM CDT | Flash Flood Warning | GRB | Brown, Outagamie | 84 min |
| Aug 28, 1:38 AM CDT | Areal Flood Advisory | GRB | Brown, Calumet, Manitowoc | 82 min |
| Aug 28, 7:41 AM CDT | River Flood Warning | GRB | Wood | 21 days |
| Aug 28, 10:14 AM CDT | Beach Hazards Statement | GRB | Door | 33 hr |
| Aug 28, 10:14 AM CDT | Small Craft Advisory | GRB | 33 hr | |
| Aug 28, 10:36 AM CDT | River Flood Warning | GRB | Wood | 48 hr |
| Aug 28, 5:17 PM CDT | Special Weather Statement | GRB | Manitowoc | 58 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2021Every 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.