Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 64, NWS Green Bay, WI

August 8, 20216 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 8, 2021, 4:30 PM CDT for 6 counties in Wisconsin. It was in force for 60 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 8, 2021, 4:30 PM CDT (21:30 UTC)
Expired: Aug 8, 2021, 5:30 PM CDT
In force: 60 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 76 km from the middle of the area, began a volume at 21:32 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 8, 4:56 PM CDT	TSTM WND DMG	2 Se Weyauwega, WI	2 TREES ON POWER LINES. TIME ESTIMATED.
Aug 8, 5:07 PM CDT	TSTM WND DMG	Readfield, WI	TREES ON POWERLINES. TIME ESTIMATED.

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 8, 1:59 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.5 hours before the alert went out and 77 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: 445 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

079 
WUUS53 KGRB 082130
SVRGRB
WIC087-097-115-135-137-139-082230-
/O.NEW.KGRB.SV.W.0064.210808T2130Z-210808T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
430 PM CDT Sun Aug 8 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Eastern Portage County in central Wisconsin...
  Northern Winnebago County in east central Wisconsin...
  Northeastern Waushara County in central Wisconsin...
  Waupaca County in northeastern Wisconsin...
  Western Outagamie County in northeastern Wisconsin...
  Western Shawano County in northeastern Wisconsin...

* Until 530 PM CDT.

* At 429 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles north of Plainfield to near Redgranite to
  near Berlin, moving northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Amherst, Waupaca, Fremont, Lake Poygan, New London, Appleton and 
  Menasha.

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 4431 8960 4468 8927 4468 8922 4473 8922
      4485 8912 4458 8857 4430 8833 4405 8866
TIME...MOT...LOC 2129Z 217DEG 30KT 4432 8947 4408 8912 4392 8898 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kieckbusch

4 follow-up statements

021 
WWUS53 KGRB 082156
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
456 PM CDT Sun Aug 8 2021

WIC097-115-082205-
/O.CAN.KGRB.SV.W.0064.000000T0000Z-210808T2230Z/
Portage WI-Shawano WI-
456 PM CDT Sun Aug 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PORTAGE AND WESTERN
SHAWANO COUNTIES IS CANCELLED...

The storms which prompted the warning have weakened. Therefore, the 
warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
central, northeastern and east central Wisconsin.

LAT...LON 4424 8935 4425 8923 4434 8923 4468 8888
      4468 8877 4460 8861 4459 8860 4458 8857
      4430 8833 4405 8866
TIME...MOT...LOC 2155Z 233DEG 33KT 4433 8902 4423 8887 4408 8886 

$$

WIC087-135-137-139-082230-
/O.CON.KGRB.SV.W.0064.000000T0000Z-210808T2230Z/
Winnebago WI-Waushara WI-Waupaca WI-Outagamie WI-
456 PM CDT Sun Aug 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHERN WINNEBAGO...NORTHEASTERN WAUSHARA...WAUPACA AND WESTERN
OUTAGAMIE COUNTIES...

At 455 PM CDT, severe thunderstorms were located along a line
extending from near Waupaca to near Fremont to near Lake Poygan,
moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Appleton, Waupaca, Menasha, Little Chute, New London, Clintonville,
Fremont, Lake Poygan, Hartman Creek State Park and Chain O'
Lakes-King.

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 4424 8935 4425 8923 4434 8923 4468 8888
      4468 8877 4460 8861 4459 8860 4458 8857
      4430 8833 4405 8866
TIME...MOT...LOC 2155Z 233DEG 33KT 4433 8902 4423 8887 4408 8886 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kieckbusch

212 
WWUS53 KGRB 082210
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
510 PM CDT Sun Aug 8 2021

WIC087-135-137-139-082230-
/O.CON.KGRB.SV.W.0064.000000T0000Z-210808T2230Z/
Winnebago WI-Waushara WI-Waupaca WI-Outagamie WI-
510 PM CDT Sun Aug 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHERN WINNEBAGO...NORTHEASTERN WAUSHARA...CENTRAL WAUPACA AND
WESTERN OUTAGAMIE COUNTIES...

At 510 PM CDT, severe thunderstorms were located along a line
extending from 10 miles north of Fremont to near New London to 10
miles east of Lake Poygan, moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Appleton, Waupaca, Menasha, Little Chute, New London, Clintonville,
Fremont, Lake Poygan, Neenah and Greenville.

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 4414 8894 4436 8912 4468 8888 4468 8877
      4460 8861 4459 8860 4458 8857 4430 8833
      4405 8866
TIME...MOT...LOC 2210Z 218DEG 33KT 4441 8888 4434 8875 4418 8866 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kieckbusch

211 
WWUS53 KGRB 082217
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
517 PM CDT Sun Aug 8 2021

WIC137-082227-
/O.CAN.KGRB.SV.W.0064.000000T0000Z-210808T2230Z/
Waushara WI-
517 PM CDT Sun Aug 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN WAUSHARA COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
central, northeastern and east central Wisconsin.

LAT...LON 4440 8909 4457 8896 4458 8874 4460 8861
      4458 8857 4430 8833 4405 8866
TIME...MOT...LOC 2217Z 225DEG 34KT 4445 8878 4438 8865 4422 8856 

$$

WIC087-135-139-082230-
/O.CON.KGRB.SV.W.0064.000000T0000Z-210808T2230Z/
Winnebago WI-Waupaca WI-Outagamie WI-
517 PM CDT Sun Aug 8 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT
FOR NORTHERN WINNEBAGO...CENTRAL WAUPACA AND WESTERN OUTAGAMIE
COUNTIES...

At 517 PM CDT, severe thunderstorms were located along a line
extending from 11 miles south of Clintonville to near New London to 6
miles west of Menasha, moving northeast at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Appleton, Waupaca, Menasha, Little Chute, New London, Fremont,
Neenah, Greenville, Dale and Hortonville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Green Bay.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4440 8909 4457 8896 4458 8874 4460 8861
      4458 8857 4430 8833 4405 8866
TIME...MOT...LOC 2217Z 225DEG 34KT 4445 8878 4438 8865 4422 8856 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kieckbusch

555 
WWUS53 KGRB 082228
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
528 PM CDT Sun Aug 8 2021

WIC087-135-139-082238-
/O.EXP.KGRB.SV.W.0064.000000T0000Z-210808T2230Z/
Winnebago WI-Waupaca WI-Outagamie WI-
528 PM CDT Sun Aug 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WINNEBAGO...CENTRAL
WAUPACA AND WESTERN OUTAGAMIE COUNTIES WILL EXPIRE AT 530 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.  However gusty winds to 50 mph and heavy rain 
are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 800 PM CDT for
central, northeastern and east central Wisconsin.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Green Bay.

LAT...LON 4440 8909 4457 8896 4458 8874 4460 8861
      4458 8857 4430 8833 4405 8866
TIME...MOT...LOC 2228Z 217DEG 30KT 4452 8871 4445 8858 4429 8849 

$$

Kieckbusch

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 7, 7:21 PM CDT	Special Weather Statement	GRB	Portage, Wood	39 min
Aug 7, 7:46 PM CDT	Areal Flood Advisory	GRB	Waushara	3 hr
Aug 7, 8:00 PM CDT	Special Weather Statement	GRB	Portage, Waupaca, Waushara	60 min
Aug 7, 8:13 PM CDT	Areal Flood Advisory	GRB	Portage, Waupaca, Waushara, Wood	3 hr
Aug 7, 8:59 PM CDT	Special Weather Statement	GRB	Waushara, Winnebago	61 min
Aug 7, 9:51 PM CDT	Special Weather Statement	GRB	Calumet, Winnebago	24 min
Aug 7, 10:15 PM CDT	Special Weather Statement	GRB	Calumet	30 min
Aug 7, 10:43 PM CDT	Special Weather Statement	GRB	Calumet	47 min
Aug 8, 1:33 AM CDT	Special Weather Statement	GRB	Shawano	42 min
Aug 8, 2:36 AM CDT	Areal Flood Advisory	GRB	Brown, Door, Kewaunee, Oconto, Outagamie, Shawano	114 min
Aug 8, 3:43 AM CDT	Areal Flood Advisory	GRB	Brown, Calumet, Manitowoc, Outagamie, Waupaca, Winnebago	2 hr
Aug 8, 4:35 AM CDT	Areal Flood Advisory	GRB	Brown, Door, Kewaunee, Manitowoc, Oconto, Outagamie and 1 more	3 hr
Aug 8, 5:03 AM CDT	Areal Flood Advisory	GRB	Calumet, Manitowoc, Portage, Waupaca, Waushara, Winnebago and 1 more	117 min
Aug 8, 5:23 AM CDT	Special Weather Statement	GRB	Wood	52 min
Aug 8, 5:37 AM CDT	Special Weather Statement	GRB	Marathon, Portage, Wood	38 min
Aug 8, 5:56 AM CDT	Areal Flood Advisory	GRB	Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Waupaca and 1 more	2 hr
Aug 8, 10:38 AM CDT	Small Craft Advisory	GRB		11 hr
Aug 8, 3:13 PM CDT	Special Weather Statement	GRB	Waushara, Wood	77 min
Aug 8, 3:54 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	51 min
Aug 8, 4:16 PM CDT	Severe Thunderstorm Warning	GRB	Waushara, Winnebago	29 min
Aug 8, 4:30 PM CDT	Special Weather Statement	GRB	Calumet, Winnebago	30 min
Aug 8, 4:46 PM CDT	Severe Thunderstorm Warning	GRB	Waushara, Winnebago	29 min
Aug 8, 5:10 PM CDT	Special Weather Statement	GRB	Brown	35 min
Aug 8, 5:27 PM CDT	Special Weather Statement	GRB	Brown, Outagamie	48 min
Aug 8, 5:41 PM CDT	Special Weather Statement	GRB	Calumet, Manitowoc	49 min
Aug 8, 6:19 PM CDT	Special Marine Warning	GRB		56 min
Aug 8, 6:22 PM CDT	Special Marine Warning	GRB		66 min
Aug 8, 6:31 PM CDT	Areal Flood Advisory	GRB	Brown, Kewaunee	62 min
Aug 8, 6:31 PM CDT	Special Weather Statement	GRB	Kewaunee, Manitowoc	44 min
Aug 8, 6:46 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee	29 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Every 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.