Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 94, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at Sep 7, 2021, 9:16 AM CDT for 5 counties in Wisconsin. It was in force for 44 min. 4 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
- Sep 7, 2021, 9:16 AM CDT (14:16 UTC)
- Expired
- Sep 7, 2021, 10:00 AM CDT
- In force
- 44 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 60.0 mph
Counties Brown County, WI, Calumet County, WI, Manitowoc County, WI, Outagamie County, WI, Winnebago County, WI
The radar
The Green Bay radar (KGRB), 34 km from the middle of the area, began a volume at 14:15 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 |
|---|---|---|---|
| Sep 7, 9:18 AM CDT | HAIL 1 | Kaukauna, WI | |
| Sep 7, 9:18 AM CDT | HAIL 1.5 | Kaukauna, WI | NEAR HWY 55 / CE. |
| Sep 7, 9:32 AM CDT | HAIL 1.25 | Maribel, WI | HIGHWAY NN AND HIGHWAY Z. |
| Sep 7, 9:37 AM CDT | HAIL 1.25 | 2 Nne Wayside, WI | REPORT FROM MPING. |
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 12:00Z, 2.3 hours before the alert went out and 31 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
- 14 J/kg
- Mixed-layer CIN
- -216 J/kg
- Mixed-layer LCL
- 1012 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- -120 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
987
WUUS53 KGRB 071416
SVRGRB
WIC009-015-071-087-139-071500-
/O.NEW.KGRB.SV.W.0094.210907T1416Z-210907T1500Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
916 AM CDT Tue Sep 7 2021
The National Weather Service in Green Bay has issued a
* Severe Thunderstorm Warning for...
South central Brown County in northeastern Wisconsin...
Northern Calumet County in east central Wisconsin...
Northeastern Winnebago County in east central Wisconsin...
Southeastern Outagamie County in northeastern Wisconsin...
Northern Manitowoc County in east central Wisconsin...
* Until 1000 AM CDT.
* At 914 AM CDT, a severe thunderstorm was located over Darboy, or
near Appleton, moving east at 55 mph. Ping pong ball size hail was
reported in Appleton 912 am.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Brillion around 930 AM CDT.
Other locations in the path of this severe thunderstorm include Two
Creeks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows!
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4414 8854 4426 8857 4433 8775 4433 8754
4435 8753 4435 8748 4417 8747 4413 8752
TIME...MOT...LOC 1414Z 269DEG 47KT 4425 8834
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Cooley3 follow-up statements
707
WWUS53 KGRB 071429
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
929 AM CDT Tue Sep 7 2021
WIC009-015-071-087-139-071500-
/O.CON.KGRB.SV.W.0094.000000T0000Z-210907T1500Z/
Brown WI-Calumet WI-Winnebago WI-Outagamie WI-Manitowoc WI-
929 AM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT
FOR SOUTH CENTRAL BROWN...NORTHERN CALUMET...NORTHEASTERN
WINNEBAGO...SOUTHEASTERN OUTAGAMIE AND NORTHERN MANITOWOC COUNTIES...
At 927 AM CDT, a severe thunderstorm was located near Brillion, or
17 miles east of Appleton, moving east at 55 mph. Another storm was
west of Menasha moving east at 55 mph capable of producing 1 inch
hail.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Two Creeks.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4414 8854 4426 8857 4433 8780 4433 8754
4435 8753 4435 8748 4417 8747 4413 8752
TIME...MOT...LOC 1427Z 267DEG 49KT 4426 8804
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
KLJ820
WWUS53 KGRB 071442
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
942 AM CDT Tue Sep 7 2021
WIC139-071450-
/O.CAN.KGRB.SV.W.0094.000000T0000Z-210907T1500Z/
Winnebago WI-
942 AM CDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WINNEBAGO COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4414 8841 4421 8841 4428 8836 4433 8781
4433 8754 4435 8753 4435 8748 4417 8747
4413 8752
TIME...MOT...LOC 1440Z 265DEG 47KT 4427 8781
$$
WIC009-015-071-087-071500-
/O.CON.KGRB.SV.W.0094.000000T0000Z-210907T1500Z/
Brown WI-Calumet WI-Outagamie WI-Manitowoc WI-
942 AM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT
FOR SOUTHEASTERN BROWN...NORTHERN CALUMET...SOUTHEASTERN OUTAGAMIE
AND NORTHERN MANITOWOC COUNTIES...
At 940 AM CDT, a severe thunderstorm was located near Denmark, or 13
miles northwest of Manitowoc, moving east at 55 mph. Another storm
was located near Kaukauna and moving east at 55 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Appleton, Manitowoc, Menasha, Kaukauna, Little Chute, Kimberly,
Brillion, Two Creeks, Northern Lake Winnebago and Darboy.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4414 8841 4421 8841 4428 8836 4433 8781
4433 8754 4435 8753 4435 8748 4417 8747
4413 8752
TIME...MOT...LOC 1440Z 265DEG 47KT 4427 8781
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
KLJ855
WWUS53 KGRB 071449
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
949 AM CDT Tue Sep 7 2021
WIC087-071459-
/O.CAN.KGRB.SV.W.0094.000000T0000Z-210907T1500Z/
Outagamie WI-
949 AM CDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OUTAGAMIE COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4414 8813 4431 8810 4433 8782 4433 8754
4435 8753 4435 8748 4417 8747 4413 8752
TIME...MOT...LOC 1449Z 266DEG 46KT 4429 8766
$$
WIC009-015-071-071500-
/O.CON.KGRB.SV.W.0094.000000T0000Z-210907T1500Z/
Brown WI-Calumet WI-Manitowoc WI-
949 AM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 AM CDT
FOR SOUTHEASTERN BROWN...NORTHEASTERN CALUMET AND NORTHERN MANITOWOC
COUNTIES...
At 949 AM CDT, a severe thunderstorm was located near Two Creeks, or
13 miles north of Manitowoc, moving east at 50 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Manitowoc, Brillion, Two Creeks, Two Rivers, Morrison, Cato,
Mishicot, Larrabee, Cooperstown and Reedsville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4414 8813 4431 8810 4433 8782 4433 8754
4435 8753 4435 8748 4417 8747 4413 8752
TIME...MOT...LOC 1449Z 266DEG 46KT 4429 8766
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
KLJThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 2:16 AM CDT | Special Weather Statement | GRB | Vilas | 89 min |
| Sep 7, 3:08 AM CDT | Special Weather Statement | GRB | Vilas | 97 min |
| Sep 7, 3:38 AM CDT | Special Weather Statement | GRB | Oneida, Vilas | 67 min |
| Sep 7, 4:22 AM CDT | Special Weather Statement | GRB | Florence, Forest, Langlade, Lincoln | 38 min |
| Sep 7, 5:23 AM CDT | Special Weather Statement | GRB | Marinette, Menominee, Oconto | 52 min |
| Sep 7, 6:09 AM CDT | Special Weather Statement | GRB | Door, Oconto | 51 min |
| Sep 7, 6:17 AM CDT | Special Marine Warning | GRB | 88 min | |
| Sep 7, 8:04 AM CDT | Special Weather Statement | GRB | Outagamie, Waupaca | 41 min |
| Sep 7, 8:11 AM CDT | Severe Thunderstorm Warning | GRB | Outagamie, Waupaca | 49 min |
| Sep 7, 8:16 AM CDT | Special Marine Warning | GRB | 59 min | |
| Sep 7, 8:28 AM CDT | Special Weather Statement | GRB | Kewaunee | 62 min |
| Sep 7, 8:42 AM CDT | Special Marine Warning | GRB | 63 min | |
| Sep 7, 8:42 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Outagamie | 48 min |
| Sep 7, 9:02 AM CDT | Severe Thunderstorm Warning | GRB | Waushara, Winnebago | 43 min |
| Sep 7, 9:09 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Kewaunee, Manitowoc | 36 min |
| Sep 7, 9:19 AM CDT | Special Marine Warning | GRB | 86 min | |
| Sep 7, 9:30 AM CDT | Severe Thunderstorm Warning | GRB | Calumet, Manitowoc, Winnebago | 60 min |
| Sep 7, 9:48 AM CDT | Special Weather Statement | GRB | Kewaunee | 27 min |
| Sep 7, 10:18 AM CDT | Severe Thunderstorm Warning | GRB | Calumet, Manitowoc | 42 min |
| Sep 7, 10:23 AM CDT | Special Marine Warning | GRB | 52 min | |
| Sep 7, 11:14 AM CDT | Special Marine Warning | GRB | 26 min | |
| Sep 7, 6:05 PM CDT | Special Weather Statement | GRB | Oneida, Vilas | 40 min |
| Sep 7, 6:44 PM CDT | Special Weather Statement | GRB | Forest, Oneida | 46 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.