Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 73, NWS Green Bay, WI

August 11, 2021Florence County, Forest County, Marinette County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 11, 2021, 12:53 PM CDT for Florence County, Forest County, Marinette County, Wisconsin. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 11, 2021, 12:53 PM CDT (17:53 UTC)
Expired: Aug 11, 2021, 1:30 PM CDT
In force: 37 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Florence County, WI, Forest County, WI, Marinette County, WI

The radar

The Marquette radar (KMQT), 90 km from the middle of the area, began a volume at 17:55 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.

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 11, 12:17 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.9 hours before the alert went out and 149 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: 1499 J/kg
Mixed-layer CIN: -136 J/kg
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 206 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

660 
WUUS53 KGRB 111753
SVRGRB
WIC037-041-075-111830-
/O.NEW.KGRB.SV.W.0073.210811T1753Z-210811T1830Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1253 PM CDT Wed Aug 11 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  East central Forest County in northeastern Wisconsin...
  Florence County in northeastern Wisconsin...
  Northern Marinette County in northeastern Wisconsin...

* Until 130 PM CDT.

* At 1252 PM CDT, a severe thunderstorm was located near Homestead,
  or 8 miles west of Kingsford, moving east at 60 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...
  Kingsford around 100 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

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.

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

&&

LAT...LON 4594 8817 4592 8810 4588 8810 4587 8807
      4582 8813 4581 8813 4578 8807 4579 8799
      4577 8799 4576 8796 4575 8788 4573 8786
      4571 8781 4568 8778 4566 8863 4594 8864
      4595 8818
TIME...MOT...LOC 1752Z 265DEG 52KT 4577 8828 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kieckbusch

3 follow-up statements

813 
WWUS53 KGRB 111800
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
100 PM CDT Wed Aug 11 2021

WIC041-111810-
/O.CAN.KGRB.SV.W.0073.000000T0000Z-210811T1830Z/
Forest WI-
100 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL FOREST COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

LAT...LON 4594 8817 4592 8810 4588 8810 4587 8807
      4582 8813 4581 8813 4578 8807 4579 8799
      4577 8799 4576 8796 4575 8788 4573 8786
      4571 8781 4568 8778 4567 8832 4589 8832
      4595 8818
TIME...MOT...LOC 1800Z 263DEG 46KT 4578 8820 

$$

WIC037-075-111830-
/O.CON.KGRB.SV.W.0073.000000T0000Z-210811T1830Z/
Florence WI-Marinette WI-
100 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM CDT
FOR SOUTHEASTERN FLORENCE AND NORTHERN MARINETTE COUNTIES...

At 100 PM CDT, a severe thunderstorm was located over Homestead, or
near Kingsford, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe storm will be near...
  Kingsford around 105 PM CDT.

Other locations impacted by this severe thunderstorm include Aurora,
Commonwealth, Niagara, Lasalle Falls and Spread Eagle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

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.

&&

LAT...LON 4594 8817 4592 8810 4588 8810 4587 8807
      4582 8813 4581 8813 4578 8807 4579 8799
      4577 8799 4576 8796 4575 8788 4573 8786
      4571 8781 4568 8778 4567 8832 4589 8832
      4595 8818
TIME...MOT...LOC 1800Z 263DEG 46KT 4578 8820 

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

$$
Kieckbusch

559 
WWUS53 KGRB 111816
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
116 PM CDT Wed Aug 11 2021

WIC037-075-111830-
/O.CON.KGRB.SV.W.0073.000000T0000Z-210811T1830Z/
Florence WI-Marinette WI-
116 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 PM CDT
FOR SOUTHEASTERN FLORENCE AND NORTH CENTRAL MARINETTE COUNTIES...

At 116 PM CDT, a severe thunderstorm was located over Norway, or near
Iron Mountain, moving east at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe thunderstorm will remain over mainly rural areas of
southeastern Florence and north central Marinette Counties, including
the following locations... Aurora, Niagara and Spread Eagle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

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.

&&

LAT...LON 4592 8810 4588 8810 4587 8807 4582 8813
      4581 8813 4578 8807 4579 8799 4577 8799
      4576 8796 4575 8788 4573 8786 4571 8781
      4568 8778 4568 8811 4582 8821
TIME...MOT...LOC 1816Z 260DEG 46KT 4579 8793 

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

$$
Kieckbusch

634 
WWUS53 KGRB 111822
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
122 PM CDT Wed Aug 11 2021

WIC037-075-111832-
/O.EXP.KGRB.SV.W.0073.000000T0000Z-210811T1830Z/
Florence WI-Marinette WI-
122 PM CDT Wed Aug 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN FLORENCE AND
NORTH CENTRAL MARINETTE COUNTIES WILL EXPIRE AT 130 PM 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.

A Tornado Watch remains in effect until 800 PM CDT for northeastern
Wisconsin.

LAT...LON 4592 8810 4588 8810 4587 8807 4582 8813
      4581 8813 4578 8807 4579 8799 4577 8799
      4576 8796 4575 8788 4573 8786 4571 8781
      4568 8778 4568 8811 4582 8821
TIME...MOT...LOC 1822Z 265DEG 52KT 4580 8781 

$$

Kieckbusch

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 7:00 PM CDT	Special Marine Warning	GRB		60 min
Aug 10, 7:06 PM CDT	Special Marine Warning	GRB		54 min
Aug 10, 7:11 PM CDT	Flash Flood Warning	GRB	Brown	3 hr
Aug 10, 7:20 PM CDT	Special Weather Statement	GRB	Calumet, Manitowoc	55 min
Aug 10, 7:30 PM CDT	Special Weather Statement	GRB	Door, Marinette	60 min
Aug 10, 7:49 PM CDT	Special Marine Warning	GRB		86 min
Aug 10, 7:52 PM CDT	Severe Thunderstorm Warning	GRB	Calumet, Kewaunee, Manitowoc	38 min
Aug 10, 7:54 PM CDT	Tornado Warning	GRB	Marinette	25 min
Aug 10, 10:05 PM CDT	Areal Flood Advisory	GRB	Brown	70 min
Aug 11, 3:11 AM CDT	Small Craft Advisory	GRB		19 hr
Aug 11, 11:25 AM CDT	Special Weather Statement	GRB	Oneida	65 min
Aug 11, 11:54 AM CDT	Special Weather Statement	GRB	Lincoln, Marathon, Portage, Wood	51 min
Aug 11, 12:18 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	42 min
Aug 11, 12:30 PM CDT	Special Weather Statement	GRB	Marathon	45 min
Aug 11, 12:38 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	52 min
Aug 11, 12:42 PM CDT	Special Weather Statement	GRB	Florence, Forest	33 min
Aug 11, 12:57 PM CDT	Tornado Warning	GRB	Langlade, Lincoln, Marathon	33 min
Aug 11, 1:04 PM CDT	Tornado Warning	GRB	Marathon	41 min
Aug 11, 1:14 PM CDT	Special Weather Statement	GRB	Shawano	46 min
Aug 11, 1:20 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln, Marathon, Menominee, Shawano	40 min
Aug 11, 1:24 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Menominee, Portage, Shawano, Waupaca	51 min
Aug 11, 1:31 PM CDT	Severe Thunderstorm Warning	GRB	Oconto, Shawano, Waupaca	44 min
Aug 11, 1:40 PM CDT	Tornado Warning	GRB	Marathon	20 min
Aug 11, 1:54 PM CDT	Areal Flood Advisory	GRB	Marathon, Menominee, Shawano	3 hr
Aug 11, 1:54 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Wood	51 min
Aug 11, 2:07 PM CDT	Tornado Warning	GRB	Brown, Oconto, Shawano	23 min
Aug 11, 2:09 PM CDT	Tornado Warning Tornado observed	GRB	Marathon	51 min
Aug 11, 2:16 PM CDT	Flash Flood Warning	GRB	Marathon	5 hr
Aug 11, 2:25 PM CDT	Special Marine Warning	GRB		65 min
Aug 11, 2:27 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Oconto	35 min
Aug 11, 2:37 PM CDT	Areal Flood Advisory	GRB	Marinette, Oconto	2 hr
Aug 11, 2:46 PM CDT	Special Marine Warning	GRB		59 min
Aug 11, 2:47 PM CDT	Severe Thunderstorm Warning	GRB	Waushara	43 min
Aug 11, 2:47 PM CDT	Tornado Warning	GRB	Marathon	43 min
Aug 11, 2:51 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee	39 min
Aug 11, 2:55 PM CDT	Areal Flood Advisory	GRB	Door	2 hr
Aug 11, 2:58 PM CDT	Special Weather Statement	GRB	Waupaca	47 min
Aug 11, 3:07 PM CDT	Flash Flood Warning	GRB	Marathon	4 hr
Aug 11, 3:08 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Shawano, Waupaca	38 min
Aug 11, 3:11 PM CDT	Special Marine Warning	GRB		64 min
Aug 11, 3:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	GRB	Waushara	18 min
Aug 11, 3:30 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Door, Kewaunee, Oconto, Outagamie, Shawano	60 min
Aug 11, 3:33 PM CDT	Special Marine Warning	GRB		57 min
Aug 11, 3:51 PM CDT	Special Weather Statement	GRB	Outagamie, Winnebago	39 min
Aug 11, 4:05 PM CDT	Special Marine Warning	GRB		55 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.