Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 37, NWS Green Bay, WI

July 6, 2021Marathon County, Wood County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 6, 2021, 3:38 PM CDT for Marathon County, Wood County, Wisconsin. It was in force for 52 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 6, 2021, 3:38 PM CDT (20:38 UTC)
Expired
Jul 6, 2021, 4:30 PM CDT
In force
52 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), 133 km from the middle of the area, began a volume at 20:39 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

TimeReportWhereRemark
Jul 6, 4:28 PM CDTTSTM WND GST 63Marshfield, WI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 6, 2:01 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.6 hours before the alert went out and 154 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2021-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 34 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2021-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
34 J/kg
Mixed-layer CIN
-188 J/kg
Mixed-layer LCL
1667 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

710 
WUUS53 KGRB 062038
SVRGRB
WIC073-141-062130-
/O.NEW.KGRB.SV.W.0037.210706T2038Z-210706T2130Z/

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

The National Weather Service in Green Bay has issued a

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

* Until 430 PM CDT.

* At 337 PM CDT, severe thunderstorms were located along a line
  extending from 8 miles south of Thorp to near Greenwood to 7 miles
  west of Neillsville to near Hatfield, 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, Marshfield and Pittsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4493 9032 4494 8989 4470 8980 4468 8981
      4468 8985 4456 8985 4433 9001 4436 9032
TIME...MOT...LOC 2037Z 271DEG 38KT 4484 9075 4473 9069 4459 9073 4448
9081

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

Kallas
2 follow-up statements
990 
WWUS53 KGRB 062052
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
352 PM CDT Tue Jul 6 2021

WIC073-141-062130-
/O.CON.KGRB.SV.W.0037.000000T0000Z-210706T2130Z/
Wood WI-Marathon WI-
352 PM CDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR WOOD AND SOUTHWESTERN MARATHON COUNTIES...

At 351 PM CDT, severe thunderstorms were located along a line
extending from near Greenwood to Loyal to near Neillsville to 6 
miles northeast of Hatfield, moving east at 50 mph. Other 
thunderstorms were located near Spencer and west of Pittsville.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Marshfield, Abbotsford, Spencer, Pittsville, Colby, Stratford, Edgar,
Hewitt, Sherry and Auburndale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4493 9032 4494 8989 4470 8980 4468 8981
      4468 8985 4456 8985 4433 9001 4436 9032
TIME...MOT...LOC 2051Z 269DEG 41KT 4484 9053 4473 9047 4460 9051 4449
9066

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

Kallas
088 
WWUS53 KGRB 062110
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
410 PM CDT Tue Jul 6 2021

WIC073-141-062130-
/O.CON.KGRB.SV.W.0037.000000T0000Z-210706T2130Z/
Wood WI-Marathon WI-
410 PM CDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR WOOD AND SOUTHWESTERN MARATHON COUNTIES...

At 409 PM CDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Colby to near Marshfield to 9
miles north of Pittsville to 9 miles southeast of Shortville, moving
east at 50 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Marshfield, Abbotsford, Spencer, Pittsville, Colby, Stratford, Edgar,
Hewitt, Sherry and Auburndale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4493 9032 4494 8989 4470 8980 4468 8981
      4468 8985 4456 8985 4433 9001 4436 9032
TIME...MOT...LOC 2109Z 275DEG 42KT 4484 9023 4470 9017 4457 9017 4443
9035

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

Kallas

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 5, 7:11 PM CDTSpecial Weather StatementGRBMarathon49 min
Jul 5, 8:03 PM CDTSpecial Weather StatementGRBOutagamie27 min
Jul 5, 8:23 PM CDTSpecial Weather StatementGRBCalumet, Outagamie, Winnebago52 min
Jul 6, 4:13 AM CDTBeach Hazards StatementGRBKewaunee, Manitowoc60 hr
Jul 6, 4:28 AM CDTSmall Craft AdvisoryGRB60 hr
Jul 6, 1:34 PM CDTSpecial Marine WarningGRB41 min
Jul 6, 1:36 PM CDTSpecial Weather StatementGRBBrown, Calumet, Kewaunee, Manitowoc, Outagamie, Shawano and 1 more54 min
Jul 6, 2:29 PM CDTSpecial Weather StatementGRBBrown, Calumet, Kewaunee, Manitowoc, Oconto, Outagamie and 2 more46 min
Jul 6, 3:14 PM CDTSpecial Weather StatementGRBOutagamie46 min
Jul 6, 3:16 PM CDTSpecial Weather StatementGRBBrown, Manitowoc44 min
Jul 6, 3:18 PM CDTSpecial Weather StatementGRBKewaunee42 min
Jul 6, 3:21 PM CDTSpecial Weather StatementGRBPortage39 min
Jul 6, 3:27 PM CDTSpecial Weather StatementGRBWood78 min
Jul 6, 3:35 PM CDTSpecial Weather StatementGRBLanglade40 min
Jul 6, 3:45 PM CDTSpecial Weather StatementGRBCalumet45 min
Jul 6, 3:52 PM CDTSpecial Weather StatementGRBOutagamie53 min
Jul 6, 4:03 PM CDTSpecial Weather StatementGRBMenominee42 min
Jul 6, 4:28 PM CDTSevere Thunderstorm WarningGRBMarathon, Portage, Wood62 min
Jul 6, 4:29 PM CDTSpecial Weather StatementGRBCalumet46 min
Jul 6, 4:44 PM CDTSpecial Weather StatementGRBMenominee46 min
Jul 6, 4:55 PM CDTSpecial Weather StatementGRBOconto50 min
Jul 6, 4:59 PM CDTSpecial Weather StatementGRBCalumet46 min
Jul 6, 5:11 PM CDTAreal Flood AdvisoryGRBMarathon, Portage, Shawano, Waupaca, Wood3 hr
Jul 6, 5:27 PM CDTSevere Thunderstorm WarningGRBMarathon, Portage, Shawano, Waupaca, Waushara, Wood48 min
Jul 6, 5:56 PM CDTSpecial Weather StatementGRBPortage49 min
Jul 6, 6:14 PM CDTSpecial Weather StatementGRBWinnebago46 min
Jul 6, 6:21 PM CDTAreal Flood AdvisoryGRBCalumet, Outagamie, Winnebago3 hr
Jul 6, 6:25 PM CDTSpecial Weather StatementGRBMarathon50 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021Every 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.