Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 90, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at Sep 7, 2021, 8:11 AM CDT for Outagamie County, Waupaca County, Wisconsin. It was in force for 49 min. 17 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, 8:11 AM CDT (13:11 UTC)
- Expired
- Sep 7, 2021, 9:00 AM CDT
- In force
- 49 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Outagamie County, WI, Waupaca County, WI
The radar
The Green Bay radar (KGRB), 60 km from the middle of the area, began a volume at 13:11 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 |
|---|---|---|---|
| Sep 7, 8:25 AM CDT | HAIL 1 | 1 W New London, WI | |
| Sep 7, 8:28 AM CDT | HAIL 0.75 | New London, WI | |
| Sep 7, 8:38 AM CDT | HAIL 1 | 2 Nne Stephensville, WI | |
| Sep 7, 8:39 AM CDT | HAIL 1.75 | New London, WI | 2 MILES WEST OF HIGHWAY M AND S. |
| Sep 7, 8:40 AM CDT | HAIL 2.5 | 6 N Appleton, WI | TENNIS BALL SIZED HAIL OF 2.4 TO 2.5 INCHES. SIX MILES NORTH OF THE APPLETON AIRPORT. HAIL HITTING THE GROUND AND BREAKING. |
| Sep 7, 8:45 AM CDT | HAIL 1.75 | Mackville, WI | |
| Sep 7, 8:45 AM CDT | HAIL 2.5 | 6 N Appleton, WI | TENNIS BALL SIZED HAIL OF 2.4 TO 2.5 INCHES. SIX MILES NORTH OF THE APPLETON AIRPORT. HAIL HITTING THE GROUND AND BREAKING. |
| Sep 7, 8:45 AM CDT | HAIL 4 | 4 W Mackville, WI | CORRECTS LOCATION AND SIZE OF TENNIS BALL SIZED HAIL FROM PREVIOUS REPORT. HAIL OF 4.1 INCHES WAS MEASURED. SIX MILES NORTH OF THE APPLETON AIRPORT. HAIL HITTING THE GROUND AND BREAKING. |
| Sep 7, 8:47 AM CDT | HAIL 1 | Hortonville, WI | IN DOWNTOWN HORTONVILLE |
| Sep 7, 8:47 AM CDT | HAIL 1 | Hortonville, WI | IN DOWNTOWN HORTONVILLE. |
| Sep 7, 8:47 AM CDT | HAIL 4.25 | 5 Nne Appleton, WI | 4.5 INCH HAIL MEASURED. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR. |
| Sep 7, 8:47 AM CDT | HAIL 4.5 | 5 Nne Appleton, WI | CORRECTS SIZE OF THE PREVIOUS HAIL REPORT FROM 5 NNE APPLETON. 4.5 INCH HAIL MEASURED. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR. |
| Sep 7, 8:48 AM CDT | HAIL 2.75 | 2 Ene Mackville, WI | BROKE HOME WINDOW. |
| Sep 7, 8:50 AM CDT | HAIL 1 | 5 Sse Black Creek, WI | ONE INCH OR GREATER HAIL NEAR HIGHWAY S AND 47. |
| Sep 7, 8:53 AM CDT | HAIL 2 | 3 Wsw Hortonville, WI | HAILED FOR 2 MINUTES. HIGHWAY T AND TT. |
| Sep 7, 8:53 AM CDT | HAIL 2 | 5 Se New London, WI | HAILED FOR 2 MINUTES. HIGHWAY T AND TT. |
| Sep 7, 9:10 AM CDT | HAIL 1 | 5 Nne Appleton, WI | NORTHEAST SIDE OF APPLETON AT JJ AND FRENCH ROAD. |
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, 1.2 hours before the alert went out and 61 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.
433
WUUS53 KGRB 071311
SVRGRB
WIC087-135-071400-
/O.NEW.KGRB.SV.W.0090.210907T1311Z-210907T1400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
811 AM CDT Tue Sep 7 2021
The National Weather Service in Green Bay has issued a
* Severe Thunderstorm Warning for...
Southern Waupaca County in northeastern Wisconsin...
Western Outagamie County in northeastern Wisconsin...
* Until 900 AM CDT.
* At 811 AM CDT, a severe thunderstorm was located near Waupaca,
moving east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage
to roofs, siding, and trees.
* This severe thunderstorm will be near...
New London around 825 AM CDT.
Other locations in the path of this severe thunderstorm include Black
Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4428 8915 4445 8919 4457 8844 4433 8833
TIME...MOT...LOC 1311Z 261DEG 47KT 4439 8901
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Cooley2 follow-up statements
217
WWUS53 KGRB 071326
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
826 AM CDT Tue Sep 7 2021
WIC087-135-071400-
/O.CON.KGRB.SV.W.0090.000000T0000Z-210907T1400Z/
Waupaca WI-Outagamie WI-
826 AM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CDT
FOR SOUTHERN WAUPACA AND WESTERN OUTAGAMIE COUNTIES...
At 824 AM CDT, a severe thunderstorm was located over New London, or
15 miles east of Waupaca with another storm developing just south
of Waupaca, moving east at 55 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Black Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4428 8915 4445 8919 4457 8844 4433 8833
TIME...MOT...LOC 1324Z 261DEG 47KT 4442 8877
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Cooley754
WWUS53 KGRB 071351
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
851 AM CDT Tue Sep 7 2021
WIC087-135-071400-
/O.EXP.KGRB.SV.W.0090.000000T0000Z-210907T1400Z/
Waupaca WI-Outagamie WI-
851 AM CDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WAUPACA AND WESTERN
OUTAGAMIE COUNTIES WILL EXPIRE AT 900 AM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
Remember, a Severe Thunderstorm Warning still remains in effect for
southeastern portions of the county.
LAT...LON 4428 8915 4445 8919 4457 8844 4433 8833
TIME...MOT...LOC 1350Z 261DEG 47KT 4447 8831
$$
CooleyThe 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, 8:16 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, 9:16 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Calumet, Manitowoc, Outagamie, Winnebago | 44 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.