Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 5, NWS Green Bay, WI

May 2, 2021Outagamie County, Waupaca County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at May 2, 2021, 4:45 PM CDT for Outagamie County, Waupaca County, Wisconsin. It was in force for 60 min. 2 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: May 2, 2021, 4:45 PM CDT (21:45 UTC)
Expired: May 2, 2021, 5:45 PM CDT
In force: 60 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Outagamie County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 70 km from the middle of the area, began a volume at 21:48 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
May 2, 4:57 PM CDT	HAIL 0.88	6 Sw Weyauwega, WI
May 2, 5:04 PM CDT	HAIL 0.88	Fremont, WI

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, 9.8 hours before the alert went out and 70 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: 1571 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 202 m²/s²
0-3 km storm-relative helicity: 312 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

603 
WUUS53 KGRB 022145
SVRGRB
WIC087-135-022245-
/O.NEW.KGRB.SV.W.0005.210502T2145Z-210502T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
445 PM CDT Sun May 2 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Southern Waupaca County in northeastern Wisconsin...
  Southwestern Outagamie County in northeastern Wisconsin...

* Until 545 PM CDT.

* At 445 PM CDT, a severe thunderstorm was located near Waupaca,
  moving east at 30 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...
  Fremont around 500 PM CDT.
  New London around 515 PM CDT.

Other locations impacted by this severe thunderstorm include Rural,
Lind Center, King, Royalton, Northport, Sugar Bush, Readfield and
Weyauwega.

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 4433 8922 4450 8873 4427 8865 4424 8876
      4424 8916
TIME...MOT...LOC 2145Z 248DEG 26KT 4428 8903 

HAIL...1.00IN
WIND...60MPH
 
$$

Eckberg

3 follow-up statements

798 
WWUS53 KGRB 022158
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
458 PM CDT Sun May 2 2021

WIC087-135-022245-
/O.CON.KGRB.SV.W.0005.000000T0000Z-210502T2245Z/
Waupaca WI-Outagamie WI-
458 PM CDT Sun May 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR SOUTHERN WAUPACA AND SOUTHWESTERN OUTAGAMIE COUNTIES...

At 458 PM CDT, a severe thunderstorm was located near Fremont, or 9 
miles southeast of Waupaca, moving east at 20 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 storm will be near...
  Fremont around 510 PM CDT.
  New London around 525 PM CDT.

Other locations impacted by this severe thunderstorm include Rural,
Lind Center, King, Royalton, Northport, Sugar Bush, Readfield and
Weyauwega.

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 4433 8922 4450 8873 4427 8865 4424 8876
      4424 8916
TIME...MOT...LOC 2156Z 268DEG 16KT 4426 8894 

HAIL...1.00IN
WIND...60MPH
 
$$

Eckberg

595 
WWUS53 KGRB 022205
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
505 PM CDT Sun May 2 2021

WIC087-135-022245-
/O.CON.KGRB.SV.W.0005.000000T0000Z-210502T2245Z/
Waupaca WI-Outagamie WI-
505 PM CDT Sun May 2 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR SOUTHEASTERN WAUPACA AND SOUTHWESTERN OUTAGAMIE COUNTIES...

At 505 PM CDT, a severe thunderstorm was located over Fremont, or 11 
miles southeast of Waupaca, moving east at 20 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe storm will be near...
  New London around 525 PM CDT.

Other locations impacted by this severe thunderstorm include
Readfield and Weyauwega.

At 504 PM, nickle size hail was reported at Fremont. 

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 4434 8894 4439 8869 4427 8865 4424 8876
      4424 8898
TIME...MOT...LOC 2203Z 262DEG 19KT 4427 8889 

HAIL...1.25IN
WIND...60MPH
 
$$

Eckberg

400 
WWUS53 KGRB 022239
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
539 PM CDT Sun May 2 2021

WIC087-135-022248-
/O.EXP.KGRB.SV.W.0005.000000T0000Z-210502T2245Z/
Waupaca WI-Outagamie WI-
539 PM CDT Sun May 2 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WAUPACA AND
SOUTHWESTERN OUTAGAMIE COUNTIES WILL EXPIRE AT 545 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

LAT...LON 4434 8894 4439 8869 4427 8865 4424 8876
      4424 8898
TIME...MOT...LOC 2238Z 248DEG 26KT 4436 8858 

$$

Eckberg

The office that day

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

Issued	Product	Office	Counties	Lasted
May 1, 8:21 PM CDT	Small Craft Advisory	GRB		5 hr
May 2, 10:30 AM CDT	Small Craft Advisory	GRB		29 hr
May 2, 4:18 PM CDT	Special Weather Statement	GRB	Waushara	42 min
May 2, 4:35 PM CDT	Special Weather Statement	GRB	Waupaca	40 min
May 2, 5:13 PM CDT	Special Weather Statement	GRB	Calumet	32 min
May 2, 5:18 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Calumet, Manitowoc, Outagamie, Waupaca, Winnebago	26 min
May 2, 5:39 PM CDT	Special Weather Statement	GRB	Waushara	51 min
May 2, 5:51 PM CDT	Severe Thunderstorm Warning	GRB	Waupaca, Waushara	23 min
May 2, 5:53 PM CDT	Special Weather Statement	GRB	Brown, Calumet	52 min
May 2, 6:03 PM CDT	Special Weather Statement	GRB	Manitowoc	42 min
May 2, 6:44 PM CDT	Special Weather Statement	GRB	Calumet, Winnebago	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.