Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Green Bay, WI

April 6, 2021Langlade County, Menominee County, Oconto County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 6, 2021, 6:19 PM CDT for Langlade County, Menominee County, Oconto County, Wisconsin. It was in force for 16 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: Apr 6, 2021, 6:19 PM CDT (23:19 UTC)
Expired: Apr 6, 2021, 6:35 PM CDT
In force: 16 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Langlade County, WI, Menominee County, WI, Oconto County, WI

The radar

The Green Bay radar (KGRB), 92 km from the middle of the area, began a volume at 23:20 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 nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.3 hours before the alert went out and 94 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: 70 J/kg
Mixed-layer CIN: -340 J/kg
Mixed-layer LCL: 1266 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 121 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

979 
WUUS53 KGRB 062319
SVRGRB
WIC067-078-083-070000-
/O.NEW.KGRB.SV.W.0002.210406T2319Z-210407T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
619 PM CDT Tue Apr 6 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Northwestern Menominee County in northeastern Wisconsin...
  Northern Oconto County in northeastern Wisconsin...
  Southeastern Langlade County in north central Wisconsin...

* Until 700 PM CDT.

* At 619 PM CDT, a severe thunderstorm was located near White Lake,
  or 15 miles east of Antigo, moving northeast at 25 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  White Lake around 630 PM CDT.
  Gardner Dam Scout Camp around 635 PM CDT.
  Mountain around 700 PM CDT.

Other locations impacted by this severe thunderstorm include Boot
Lake Campground, Townsend, Elton, Upper Bass Lake, Boulder Lake
Campground, Hollister, Langlade, Lakewood, Crooked Lake and Zoar.

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 4515 8899 4538 8860 4538 8849 4520 8831
      4500 8884
TIME...MOT...LOC 2319Z 235DEG 20KT 4512 8883 

HAIL...1.00IN
WIND...<50MPH
 
$$

RDM

2 follow-up statements

640 
WWUS53 KGRB 062330
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
630 PM CDT Tue Apr 6 2021

WIC067-078-083-070000-
/O.CON.KGRB.SV.W.0002.000000T0000Z-210407T0000Z/
Menominee WI-Oconto WI-Langlade WI-
630 PM CDT Tue Apr 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR NORTH CENTRAL MENOMINEE...NORTHERN OCONTO AND SOUTHEASTERN
LANGLADE COUNTIES...

At 629 PM CDT, a severe thunderstorm was located over White Lake, or
19 miles east of Antigo, moving northeast at 25 mph.

HAZARD...Up to quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is possible.

This severe storm will be near...
  Gardner Dam Scout Camp around 635 PM CDT.
  Mountain around 700 PM CDT.

Other locations impacted by this severe thunderstorm include Boot
Lake Campground, Townsend, Elton, Boulder Lake Campground, Hollister,
Langlade, Lakewood and Crooked Lake.

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.

&&

LAT...LON 4519 8890 4538 8860 4538 8849 4520 8831
      4506 8878
TIME...MOT...LOC 2329Z 235DEG 20KT 4516 8876 

HAIL...1.00IN
WIND...<50MPH
 
$$

RDM

327 
WWUS53 KGRB 062335
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
635 PM CDT Tue Apr 6 2021

WIC067-078-083-062344-
/O.CAN.KGRB.SV.W.0002.000000T0000Z-210407T0000Z/
Menominee WI-Oconto WI-Langlade WI-
635 PM CDT Tue Apr 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MENOMINEE...
NORTHERN OCONTO AND SOUTHEASTERN LANGLADE COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.  However hail up to 
half inch is still possible with this thunderstorm.

LAT...LON 4519 8890 4538 8860 4538 8849 4520 8831
      4506 8878
TIME...MOT...LOC 2328Z 235DEG 20KT 4518 8872 

$$

RDM

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 9:13 PM CDT	Special Weather Statement	GRB	Vilas	62 min
Apr 5, 10:51 PM CDT	Special Weather Statement	GRB	Oneida, Vilas	84 min
Apr 5, 11:41 PM CDT	Special Weather Statement	GRB	Forest	49 min
Apr 6, 12:28 AM CDT	Special Weather Statement	GRB	Langlade	47 min
Apr 6, 1:07 AM CDT	Special Weather Statement	GRB	Langlade	53 min
Apr 6, 1:44 AM CDT	Special Weather Statement	GRB	Langlade	46 min
Apr 6, 2:31 AM CDT	Special Weather Statement	GRB	Marinette	59 min
Apr 6, 2:40 AM CDT	Special Weather Statement	GRB	Portage, Wood	95 min
Apr 6, 3:48 AM CDT	Special Weather Statement	GRB	Menominee, Oconto, Portage, Shawano, Waupaca	42 min
Apr 6, 3:52 AM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Portage, Waupaca	53 min
Apr 6, 4:41 AM CDT	Special Weather Statement	GRB	Outagamie, Waupaca	64 min
Apr 6, 6:48 AM CDT	Special Weather Statement	GRB	Shawano	42 min
Apr 6, 7:34 AM CDT	Special Weather Statement	GRB	Brown, Outagamie	41 min
Apr 6, 8:00 AM CDT	Special Weather Statement	GRB	Brown	45 min
Apr 6, 8:45 AM CDT	Special Weather Statement	GRB	Calumet, Kewaunee, Manitowoc	60 min
Apr 6, 3:34 PM CDT	Special Weather Statement	GRB	Marathon, Portage, Winnebago	41 min
Apr 6, 4:23 PM CDT	Special Weather Statement	GRB	Calumet, Outagamie, Shawano	37 min
Apr 6, 5:33 PM CDT	Special Weather Statement	GRB	Langlade, Lincoln, Menominee, Shawano	57 min
Apr 6, 6:23 PM CDT	Special Weather Statement	GRB	Marinette	52 min
Apr 6, 6:44 PM CDT	Special Weather Statement	GRB	Marathon	46 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.