Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 29, NWS Green Bay, WI

June 17, 2021Marathon County, Wood County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jun 17, 2021, 7:09 PM CDT for Marathon County, Wood County, Wisconsin. It was in force for 66 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: Jun 17, 2021, 7:09 PM CDT (00:09 UTC)
Expired: Jun 17, 2021, 8:15 PM CDT
In force: 66 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Marathon County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 128 km from the middle of the area, began a volume at 00:12 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
Jun 17, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.2 hours before the alert went out and 158 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: 52 J/kg
Mixed-layer CIN: -285 J/kg
Mixed-layer LCL: 1895 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 310 m²/s²
0-3 km storm-relative helicity: 397 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

432 
WUUS53 KGRB 180009
SVRGRB
WIC073-141-180115-
/O.NEW.KGRB.SV.W.0029.210618T0009Z-210618T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
709 PM CDT Thu Jun 17 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Northern Wood County in central Wisconsin...
  Southwestern Marathon County in central Wisconsin...

* Until 815 PM CDT.

* At 709 PM CDT, a severe thunderstorm was located near Greenwood, or
  11 miles north of Neillsville, moving east at 45 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Spencer and Marshfield.

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 4476 9032 4488 9031 4487 8985 4451 8984
      4451 8983 4446 8983 4449 9032
TIME...MOT...LOC 0009Z 271DEG 37KT 4472 9063 

HAIL...0.75IN
WIND...60MPH
 
$$

Eckberg

4 follow-up statements

142 
WWUS53 KGRB 180024
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
724 PM CDT Thu Jun 17 2021

WIC073-141-180115-
/O.CON.KGRB.SV.W.0029.000000T0000Z-210618T0115Z/
Wood WI-Marathon WI-
724 PM CDT Thu Jun 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR NORTHERN WOOD AND SOUTHWESTERN MARATHON COUNTIES...

At 723 PM CDT, a severe thunderstorm was located near Loyal, or 13
miles northeast of Neillsville, moving east at 45 mph.

HAZARD...60 mph wind gusts and nickel size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Marshfield, Spencer, Stratford, Hewitt, Sherry, Auburndale, Vesper,
Unity, Arpin and Milladore.

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 4476 9032 4488 9031 4487 8985 4451 8984
      4451 8983 4446 8983 4449 9032
TIME...MOT...LOC 0023Z 271DEG 37KT 4472 9042 

HAIL...0.88IN
WIND...60MPH
 
$$

Eckberg

720 
WWUS53 KGRB 180040
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
740 PM CDT Thu Jun 17 2021

WIC073-141-180115-
/O.CON.KGRB.SV.W.0029.000000T0000Z-210618T0115Z/
Wood WI-Marathon WI-
740 PM CDT Thu Jun 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR NORTHERN WOOD AND SOUTHWESTERN MARATHON COUNTIES...

At 738 PM CDT, a severe thunderstorm was located near Marshfield, or
17 miles east of Neillsville, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

This severe thunderstorm will move across northern Wood and 
southwestern Marathon Counties, including the following locations... 
Marshfield, Milladore, North Wood County Park, Sherry, Rozellville, 
Auburndale, Stratford, March Rapids, Hewitt, Blenker and Arpin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4476 9032 4488 9031 4487 8985 4451 8984
      4451 8983 4446 8983 4449 9032
TIME...MOT...LOC 0038Z 272DEG 38KT 4464 9024 

HAIL...<.75IN
WIND...60MPH
 
$$

Eckberg

306 
WWUS53 KGRB 180106
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
806 PM CDT Thu Jun 17 2021

WIC073-141-180115-
/O.CON.KGRB.SV.W.0029.000000T0000Z-210618T0115Z/
Wood WI-Marathon WI-
806 PM CDT Thu Jun 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR NORTHERN WOOD AND SOUTHWESTERN MARATHON COUNTIES...

At 805 PM CDT, a severe thunderstorm was located near Pittsville, or
15 miles northwest of Wisconsin Rapids, moving east at 40 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 remain over mainly rural areas of
northern Wood and southwestern Marathon Counties, including the
following locations... Milladore, North Wood County Park, Sherry,
Rozellville, Auburndale, Stratford, March Rapids, Hewitt, Blenker and
Arpin.

There is another severe thunderstorm warning in effect until 845 PM 
CDT for Marathon County. 

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 4476 9032 4488 9031 4487 8985 4451 8984
      4451 8983 4446 8983 4449 9032
TIME...MOT...LOC 0105Z 271DEG 35KT 4452 9009 

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

Eckberg

041 
WWUS53 KGRB 180113
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
813 PM CDT Thu Jun 17 2021

WIC073-141-180122-
/O.EXP.KGRB.SV.W.0029.000000T0000Z-210618T0115Z/
Wood WI-Marathon WI-
813 PM CDT Thu Jun 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN WOOD AND SOUTHWESTERN
MARATHON COUNTIES WILL EXPIRE AT 815 PM CDT...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire.  However small 
hail, gusty winds and heavy rain are still possible with this 
thunderstorm.

A severe thunderstorm warning remains in effect for northwest 
Marathon County until 845 PM CDT. Also, a Severe Thunderstorm 
Watch remains in effect until 1000 PM CDT for central Wisconsin.

LAT...LON 4476 9032 4488 9031 4487 8985 4451 8984
      4451 8983 4446 8983 4449 9032
TIME...MOT...LOC 0112Z 271DEG 37KT 4452 8999 

$$

Eckberg

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 7:29 PM CDT	Special Weather Statement	GRB	Kewaunee	16 min
Jun 17, 8:02 PM CDT	Severe Thunderstorm Warning	GRB	Marathon	18 min
Jun 17, 9:40 PM CDT	Special Weather Statement	GRB	Brown, Calumet, Manitowoc, Outagamie, Portage, Shawano and 4 more	65 min
Jun 18, 12:29 AM CDT	Special Marine Warning	GRB		83 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.