Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 42, NWS Green Bay, WI

July 26, 2021Marinette County, Oconto County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 26, 2021, 4:08 PM CDT for Marinette County, Oconto County, Wisconsin. It was in force for 36 min. 1 report 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 26, 2021, 4:08 PM CDT (21:08 UTC)
Expired: Jul 26, 2021, 4:44 PM CDT
In force: 36 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 70.0 mph

Counties Marinette County, WI, Oconto County, WI

The radar

The Green Bay radar (KGRB), 57 km from the middle of the area, began a volume at 21:08 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 26, 4:15 PM CDT	HAIL 0.88	Porterfield, WI	ON BORDERLINE ROAD IN PORTERFIELD. REPORT VIA SOCIAL MEDIA.

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, 9.1 hours before the alert went out and 59 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2259 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

258 
WUUS53 KGRB 262108
SVRGRB
WIC075-083-262200-
/O.NEW.KGRB.SV.W.0042.210726T2108Z-210726T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
408 PM CDT Mon Jul 26 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Southern Marinette County in northeastern Wisconsin...
  Central Oconto County in northeastern Wisconsin...

* Until 500 PM CDT.

* At 407 PM CDT, a severe thunderstorm was located 9 miles southwest
  of Marinette, moving southeast at 20 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Marinette, Oconto, Peshtigo, Porterfield, Lena, Harmony, Cullen and
  County Line.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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 4494 8759 4493 8771 4491 8777 4486 8777
      4478 8786 4492 8807 4517 8784 4506 8752
TIME...MOT...LOC 2107Z 310DEG 16KT 4503 8780 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Skowronski

3 follow-up statements

188 
WWUS53 KGRB 262117
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
417 PM CDT Mon Jul 26 2021

WIC075-083-262200-
/O.CON.KGRB.SV.W.0042.000000T0000Z-210726T2200Z/
Marinette WI-Oconto WI-
417 PM CDT Mon Jul 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHERN MARINETTE AND CENTRAL OCONTO COUNTIES...

At 417 PM CDT, a severe thunderstorm was located 8 miles southwest of
Marinette, moving southeast at 20 mph.

HAZARD...Two inch hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Marinette, Oconto, Peshtigo, Harmony, Cullen and County Line. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4494 8759 4493 8771 4491 8777 4486 8777
      4478 8786 4491 8800 4512 8778 4506 8752
TIME...MOT...LOC 2117Z 310DEG 16KT 4500 8775 

TORNADO...POSSIBLE
HAIL...2.00IN
WIND...70MPH
 
$$

Skowronski

155 
WWUS53 KGRB 262128
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
428 PM CDT Mon Jul 26 2021

WIC075-083-262200-
/O.CON.KGRB.SV.W.0042.000000T0000Z-210726T2200Z/
Marinette WI-Oconto WI-
428 PM CDT Mon Jul 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR SOUTHERN MARINETTE AND CENTRAL OCONTO COUNTIES...

At 428 PM CDT, a severe thunderstorm was located 8 miles south of
Marinette, moving southeast at 20 mph.

HAZARD...Two inch hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Oconto, Peshtigo, Harmony, Cullen and County Line. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 4494 8759 4493 8771 4491 8777 4486 8777
      4478 8786 4491 8800 4494 8797 4509 8781
      4505 8758
TIME...MOT...LOC 2128Z 310DEG 16KT 4497 8770 

TORNADO...POSSIBLE
HAIL...2.00IN
WIND...70MPH
 
$$

Skowronski

915 
WWUS53 KGRB 262144
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
444 PM CDT Mon Jul 26 2021

WIC075-083-262153-
/O.CAN.KGRB.SV.W.0042.000000T0000Z-210726T2200Z/
Marinette WI-Oconto WI-
444 PM CDT Mon Jul 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MARINETTE AND CENTRAL
OCONTO COUNTIES IS CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.

LAT...LON 4494 8759 4493 8771 4491 8777 4486 8777
      4478 8786 4491 8800 4494 8797 4509 8781
      4505 8758
TIME...MOT...LOC 2143Z 310DEG 16KT 4492 8762 

$$

Skowronski

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 2:39 PM CDT	Special Weather Statement	GRB	Portage	36 min
Jul 26, 2:49 PM CDT	Special Weather Statement	GRB	Marinette	26 min
Jul 26, 3:08 PM CDT	Special Weather Statement	GRB	Waupaca	37 min
Jul 26, 3:21 PM CDT	Special Weather Statement	GRB	Marinette	24 min
Jul 26, 3:28 PM CDT	Special Weather Statement	GRB	Brown	32 min
Jul 26, 3:42 PM CDT	Special Weather Statement	GRB	Outagamie	33 min
Jul 26, 3:45 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	45 min
Jul 26, 3:46 PM CDT	Special Marine Warning	GRB		59 min
Jul 26, 4:01 PM CDT	Special Weather Statement	GRB	Brown	44 min
Jul 26, 4:10 PM CDT	Special Marine Warning	GRB		65 min
Jul 26, 4:19 PM CDT	Special Weather Statement	GRB	Brown	41 min
Jul 26, 4:32 PM CDT	Severe Thunderstorm Warning	GRB	Door	43 min
Jul 26, 4:34 PM CDT	Special Weather Statement	GRB	Kewaunee	56 min
Jul 26, 4:54 PM CDT	Special Marine Warning	GRB		2 hr
Jul 26, 4:58 PM CDT	Severe Thunderstorm Warning	GRB	Kewaunee	32 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.