Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 1, NWS Green Bay, WI

April 6, 2021Outagamie County, Portage County, Waupaca County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 6, 2021, 3:52 AM CDT for Outagamie County, Portage County, Waupaca County, Wisconsin. It was in force for 53 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, 3:52 AM CDT (08:52 UTC)
Expired: Apr 6, 2021, 4:45 AM CDT
In force: 53 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Outagamie County, WI, Portage County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 85 km from the middle of the area, began a volume at 08:52 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 00:00Z, 8.9 hours before the alert went out and 85 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: 227 J/kg
Mixed-layer CIN: -209 J/kg
Mixed-layer LCL: 1945 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 10 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

372 
WUUS53 KGRB 060852
SVRGRB
WIC087-097-135-060945-
/O.NEW.KGRB.SV.W.0001.210406T0852Z-210406T0945Z/

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

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Southeastern Portage County in central Wisconsin...
  Central Waupaca County in northeastern Wisconsin...
  Western Outagamie County in northeastern Wisconsin...

* Until 445 AM CDT.

* At 351 AM CDT, a severe thunderstorm was located near Whiting, or 9
  miles south of Stevens Point, moving east at 40 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Stevens Point, Waupaca, New London, Whiting, Amherst, Chain O'
  Lakes-King, Hartman Creek State Park, Plover, Stockton and
  Hortonville.

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.

Torrential rainfall is occurring with this storm. Do not drive your 
vehicle through flooded roadways.

&&

LAT...LON 4431 8956 4450 8960 4457 8857 4430 8855
TIME...MOT...LOC 0851Z 266DEG 35KT 4440 8949 

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

Hykin

2 follow-up statements

876 
WWUS53 KGRB 060916
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
416 AM CDT Tue Apr 6 2021

WIC087-097-135-060945-
/O.CON.KGRB.SV.W.0001.000000T0000Z-210406T0945Z/
Portage WI-Waupaca WI-Outagamie WI-
416 AM CDT Tue Apr 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 AM CDT
FOR EAST CENTRAL PORTAGE...CENTRAL WAUPACA AND WESTERN OUTAGAMIE
COUNTIES...

At 415 AM CDT, a severe thunderstorm was located near Amherst, or 8
miles northwest of Waupaca, moving east at 40 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Waupaca, New London, Amherst, Chain O' Lakes-King, Hartman Creek
State Park, Hortonville, Weyauwega, Royalton, Manawa and Iola.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm. Do not drive your 
vehicle through flooded roadways.

&&

LAT...LON 4431 8925 4451 8935 4457 8857 4430 8855
TIME...MOT...LOC 0915Z 265DEG 33KT 4441 8923 

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

Hykin

601 
WWUS53 KGRB 060936
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
436 AM CDT Tue Apr 6 2021

WIC087-097-135-060945-
/O.EXP.KGRB.SV.W.0001.000000T0000Z-210406T0945Z/
Portage WI-Waupaca WI-Outagamie WI-
436 AM CDT Tue Apr 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL PORTAGE...CENTRAL
WAUPACA AND WESTERN OUTAGAMIE COUNTIES WILL EXPIRE AT 445 AM CDT...
                
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 will be allowed to expire.

LAT...LON 4431 8925 4451 8935 4457 8857 4430 8855
TIME...MOT...LOC 0935Z 266DEG 35KT 4442 8900 

$$

Hykin

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, 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, 6:19 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Menominee, Oconto	16 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.