Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Green Bay, WI

July 27, 20214 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 27, 2021, 12:24 AM CDT for 4 counties in Wisconsin. It was in force for 66 min. 8 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: Jul 27, 2021, 12:24 AM CDT (05:24 UTC)
Expired: Jul 27, 2021, 1:30 AM CDT
In force: 66 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Brown County, WI, Marinette County, WI, Oconto County, WI, Shawano County, WI

The radar

The Green Bay radar (KGRB), 34 km from the middle of the area, began a volume at 05:28 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
Jul 27, 12:30 AM CDT	TSTM WND GST 60	Stiles, WI	REPORT VIA SOCIAL MEDIA. TREES DOWN. ESTIMATED GUSTS TO 60 MPH.
Jul 27, 12:35 AM CDT	TSTM WND DMG	Green Bay, WI	TREES AND POWER LINES DOWN IN HOWARD,SUAMICO AND THE WEST SIDE OF GREEN BAY FROM 1235 AM TO 1255 AM. REPORT VIA SOCIAL MEDIA.
Jul 27, 12:35 AM CDT	TSTM WND DMG	Oconto Falls, WI	SEVERAL TREES DOWN ON OAKLAND STREET. PHOTOS SENT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 27, 12:40 AM CDT	TSTM WND DMG	Howard, WI	REPORT VIA LOCAL MEDIA. 12 TO 18 INCH DIAMETER TREE DOWN ON FENCED AREA. TIME ESTIMATED BY RADAR.
Jul 27, 12:43 AM CDT	TSTM WND DMG	Peshtigo, WI	TREES AND POWER LINES DOWN. TIME ESTIMATED BY RADAR.
Jul 27, 12:49 AM CDT	TSTM WND GST 61	Green Bay, WI	GREEN BAY AIRPORT MEASURED WIND GUST.
Jul 27, 12:54 AM CDT	TSTM WND DMG	1 Wsw Suamico, WI	REPORT FROM MPING. THUNDERSTORM TREE DAMAGE.
Jul 27, 12:54 AM CDT	TSTM WND DMG	2 Wsw Suamico, WI	REPORT FROM MPING. THUNDERSTORM TREE DAMAGE.

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, 5.4 hours before the alert went out and 36 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: 591 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 2073 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

333 
WUUS53 KGRB 270524
SVRGRB
WIC009-075-083-115-270630-
/O.NEW.KGRB.SV.W.0051.210727T0524Z-210727T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1224 AM CDT Tue Jul 27 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Brown County in northeastern Wisconsin...
  Southern Marinette County in northeastern Wisconsin...
  Oconto County in northeastern Wisconsin...
  Eastern Shawano County in northeastern Wisconsin...

* Until 130 AM CDT.

* At 1224 AM CDT, severe thunderstorms were located along a line
  extending from near Crivitz to near Pulaski to near New London,
  moving southeast at 55 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Pulaski around 1230 AM CDT.
  Green Bay and Marinette around 1240 AM CDT.

Other locations in the path of these severe thunderstorms include
Menominee, Bellevue Town and Bay Shore Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4424 8819 4459 8819 4459 8861 4468 8860
      4468 8864 4535 8815 4537 8788 4534 8784
      4538 8768 4517 8774 4511 8766 4511 8753
      4495 8759 4490 8777 4466 8793 4463 8793
      4470 8776 4433 8777 4433 8789 4424 8790
TIME...MOT...LOC 0524Z 301DEG 47KT 4522 8796 4474 8827 4446 8867 

HAIL...<.75IN
WIND...70MPH
 
$$

Kurimski

4 follow-up statements

401 
WWUS53 KGRB 270548
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1248 AM CDT Tue Jul 27 2021

WIC009-075-083-115-270630-
/O.CON.KGRB.SV.W.0051.000000T0000Z-210727T0630Z/
Brown WI-Marinette WI-Oconto WI-Shawano WI-
1248 AM CDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR BROWN...SOUTHERN MARINETTE...SOUTHERN OCONTO AND EASTERN SHAWANO
COUNTIES...

At 1248 AM CDT, severe thunderstorms were located along a line
extending from near Marinette to 6 miles southwest of Bay Shore Park
to Little Chute, moving southeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Green Bay, Marinette, Bay Shore Park, Menominee, Oconto, Pulaski,
Denmark, Crivitz, Pound and Bellevue Town.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

LAT...LON 4424 8819 4459 8819 4459 8861 4468 8860
      4475 8835 4536 8789 4535 8776 4538 8768
      4517 8774 4511 8766 4511 8753 4495 8759
      4490 8777 4471 8792 4466 8793 4463 8793
      4470 8776 4433 8777 4433 8789 4424 8790
TIME...MOT...LOC 0548Z 301DEG 47KT 4506 8759 4458 8790 4430 8830 

HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

288 
WWUS53 KGRB 270559
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1259 AM CDT Tue Jul 27 2021

WIC115-270608-
/O.CAN.KGRB.SV.W.0051.000000T0000Z-210727T0630Z/
Shawano WI-
1259 AM CDT Tue Jul 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 4424 8819 4459 8819 4478 8809 4517 8774
      4511 8766 4510 8759 4511 8761 4511 8753
      4495 8759 4493 8771 4490 8777 4471 8792
      4463 8793 4470 8776 4433 8777 4433 8789
      4424 8790
TIME...MOT...LOC 0558Z 301DEG 47KT 4499 8744 4451 8775 4423 8815 

$$

WIC009-075-083-270630-
/O.CON.KGRB.SV.W.0051.000000T0000Z-210727T0630Z/
Brown WI-Marinette WI-Oconto WI-
1259 AM CDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR BROWN...SOUTHERN MARINETTE AND SOUTHERN OCONTO COUNTIES...

At 1258 AM CDT, severe thunderstorms were located along a line
extending from 8 miles southwest of Egg Harbor to near Luxemburg to
near Brillion, moving southeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters. At 1247 am a wind gust to 61 mph 
         was measured at the Green Bay airport.

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

Locations impacted include...
Green Bay, Marinette, Bay Shore Park, Menominee, Oconto, Denmark,
Bellevue Town, Oneida, De Pere and Howard.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

LAT...LON 4424 8819 4459 8819 4478 8809 4517 8774
      4511 8766 4510 8759 4511 8761 4511 8753
      4495 8759 4493 8771 4490 8777 4471 8792
      4463 8793 4470 8776 4433 8777 4433 8789
      4424 8790
TIME...MOT...LOC 0558Z 301DEG 47KT 4499 8744 4451 8775 4423 8815 

HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

073 
WWUS53 KGRB 270611
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
111 AM CDT Tue Jul 27 2021

WIC075-083-270621-
/O.CAN.KGRB.SV.W.0051.000000T0000Z-210727T0630Z/
Marinette WI-Oconto WI-
111 AM CDT Tue Jul 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MARINETTE AND
SOUTHERN OCONTO COUNTIES IS CANCELLED...

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

LAT...LON 4424 8819 4451 8819 4460 8802 4463 8792
      4470 8776 4433 8777 4433 8789 4424 8790
TIME...MOT...LOC 0611Z 301DEG 47KT 4491 8726 4443 8757 4415 8797 

$$

WIC009-270630-
/O.CON.KGRB.SV.W.0051.000000T0000Z-210727T0630Z/
Brown WI-
111 AM CDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR BROWN COUNTY...

At 111 AM CDT, severe thunderstorms were located along a line
extending from near Jacksonport to near Kewaunee to near Brillion,
moving southeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters.

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

Locations impacted include...
Green Bay, Bay Shore Park, Denmark, Bellevue Town, Oneida, De Pere,
Howard, Ashwaubenon, Bellevue and Allouez.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

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

&&

LAT...LON 4424 8819 4451 8819 4460 8802 4463 8792
      4470 8776 4433 8777 4433 8789 4424 8790
TIME...MOT...LOC 0611Z 301DEG 47KT 4491 8726 4443 8757 4415 8797 

HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

591 
WWUS53 KGRB 270622
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
122 AM CDT Tue Jul 27 2021

WIC009-270632-
/O.EXP.KGRB.SV.W.0051.000000T0000Z-210727T0630Z/
Brown WI-
122 AM CDT Tue Jul 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR BROWN COUNTY WILL EXPIRE AT
130 AM CDT...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning will be allowed to expire.

LAT...LON 4424 8819 4451 8819 4460 8802 4463 8792
      4470 8776 4433 8777 4433 8789 4424 8790
TIME...MOT...LOC 0622Z 301DEG 47KT 4485 8712 4437 8743 4409 8783 

$$

Kurimski

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 8:26 PM CDT	Special Weather Statement	GRB	Door	49 min
Jul 26, 8:33 PM CDT	Special Marine Warning	GRB		36 min
Jul 26, 9:43 PM CDT	Special Weather Statement	GRB	Vilas	62 min
Jul 26, 10:30 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Vilas	50 min
Jul 26, 10:37 PM CDT	Special Weather Statement	GRB	Langlade, Lincoln	53 min
Jul 26, 10:45 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Oneida	45 min
Jul 26, 11:06 PM CDT	Severe Thunderstorm Warning	GRB	Florence	54 min
Jul 26, 11:11 PM CDT	Severe Thunderstorm Warning	GRB	Florence, Forest, Langlade, Lincoln, Marathon, Oneida	49 min
Jul 26, 11:33 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Menominee, Oconto, Shawano	57 min
Jul 26, 11:39 PM CDT	Special Weather Statement	GRB	Marinette	36 min
Jul 26, 11:58 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Outagamie, Portage, Waupaca	62 min
Jul 27, 12:16 AM CDT	Special Marine Warning	GRB		89 min
Jul 27, 12:37 AM CDT	Special Marine Warning	GRB		83 min
Jul 27, 12:51 AM CDT	Severe Thunderstorm Warning	GRB	Door, Kewaunee	54 min
Jul 27, 12:52 AM CDT	Special Weather Statement	GRB	Calumet, Winnebago	38 min
Jul 27, 12:55 AM CDT	Special Weather Statement	GRB	Manitowoc	35 min
Jul 27, 1:18 AM CDT	Special Weather Statement	GRB	Oneida	42 min
Jul 27, 1:28 AM CDT	Severe Thunderstorm Warning	GRB	Oneida	32 min
Jul 27, 1:42 AM CDT	Special Weather Statement	GRB	Manitowoc	48 min
Jul 27, 1:53 AM CDT	Special Weather Statement	GRB	Lincoln	52 min
Jul 27, 2:30 AM CDT	Special Weather Statement	GRB	Langlade	45 min
Jul 27, 2:41 AM CDT	Special Weather Statement	GRB	Langlade, Lincoln, Marathon, Menominee, Shawano	49 min
Jul 27, 3:20 AM CDT	Special Weather Statement	GRB	Brown, Marathon, Menominee, Outagamie, Portage, Shawano and 2 more	40 min
Jul 27, 3:51 AM CDT	Special Weather Statement	GRB	Brown, Calumet, Kewaunee, Manitowoc, Marathon, Outagamie and 6 more	69 min
Jul 27, 6:16 AM CDT	Special Weather Statement	GRB	Portage, Wood	44 min
Jul 27, 6:58 AM CDT	Special Weather Statement	GRB	Portage, Wood	47 min
Jul 27, 7:27 AM CDT	Special Weather Statement	GRB	Waushara	63 min
Jul 27, 8:33 AM CDT	Special Weather Statement	GRB	Calumet, Manitowoc, Portage, Waushara, Winnebago, Wood	57 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.