Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 85, NWS Green Bay, WI

August 24, 2021Marathon County, Portage County, Wood County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 24, 2021, 8:27 AM CDT for Marathon County, Portage County, Wood County, Wisconsin. It was in force for 63 min. 5 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: Aug 24, 2021, 8:27 AM CDT (13:27 UTC)
Expired: Aug 24, 2021, 9:30 AM CDT
In force: 63 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Marathon County, WI, Portage County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 136 km from the middle of the area, began a volume at 13:30 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
Aug 24, 8:41 AM CDT	HAIL 0.25	Arpin, WI
Aug 24, 8:46 AM CDT	TSTM WND GST 36	Wisconsin Rapids, WI
Aug 24, 8:46 AM CDT	TSTM WND GST 39	Wausau, WI
Aug 24, 8:47 AM CDT	TSTM WND GST 36	Wisconsin Rapids, WI
Aug 24, 8:47 AM CDT	TSTM WND GST 41	Mosinee, 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, 1.5 hours before the alert went out and 137 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: 58 J/kg
Mixed-layer CIN: -344 J/kg
Mixed-layer LCL: 1387 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: -33 m²/s²
0-3 km storm-relative helicity: 55 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

790 
WUUS53 KGRB 241327
SVRGRB
WIC073-097-141-241430-
/O.NEW.KGRB.SV.W.0085.210824T1327Z-210824T1430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
827 AM CDT Tue Aug 24 2021

The National Weather Service in Green Bay has issued a

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

* Until 930 AM CDT.

* At 826 AM CDT, severe thunderstorms were located along a line
  extending from 13 miles southwest of Council Grounds State Park to
  11 miles southwest of Mosinee to near Babcock, 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.

* Severe thunderstorms will be near...
  Mosinee around 845 AM CDT.

Other locations in the path of these severe thunderstorms include
Wisconsin Rapids, Lake Wazeecha, Bevent, Whiting and Amherst.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 4467 9000 4512 9011 4512 8923 4425 8923
      4425 9026
TIME...MOT...LOC 1326Z 257DEG 34KT 4507 8997 4469 8988 4429 9020 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kurimski

4 follow-up statements

400 
WWUS53 KGRB 241338
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
838 AM CDT Tue Aug 24 2021

WIC073-097-141-241430-
/O.CON.KGRB.SV.W.0085.000000T0000Z-210824T1430Z/
Wood WI-Portage WI-Marathon WI-
838 AM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 AM CDT
FOR WOOD...PORTAGE AND MARATHON COUNTIES...

At 838 AM CDT, severe thunderstorms were located along a line
extending from 8 miles southwest of Council Grounds State Park to 6
miles southwest of Mosinee to near Babcock, 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.

These severe storms will be near...
  Mosinee around 845 AM CDT.

Other locations in the path of these severe thunderstorms include
Wisconsin Rapids, Lake Wazeecha, Bevent, Whiting and Amherst.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 4467 9000 4512 9011 4512 8923 4425 8923
      4425 9026
TIME...MOT...LOC 1338Z 257DEG 34KT 4509 8984 4471 8975 4431 9007 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kurimski

645 
WWUS53 KGRB 241347
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
847 AM CDT Tue Aug 24 2021

WIC073-097-141-241430-
/O.CON.KGRB.SV.W.0085.000000T0000Z-210824T1430Z/
Wood WI-Portage WI-Marathon WI-
847 AM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 AM CDT
FOR WOOD...PORTAGE AND MARATHON COUNTIES...

At 846 AM CDT, severe thunderstorms were located along a line
extending from near Merrill to near Wausau to near Mosinee to 6 miles
southwest of Wisconsin Rapids, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Weston and Rib Mountain around 850 AM CDT.

Other locations in the path of these severe thunderstorms include
Bevent, Whiting and Amherst.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 4467 9000 4512 9011 4512 8923 4425 8923
      4425 9026
TIME...MOT...LOC 1346Z 256DEG 40KT 4511 8971 4494 8958 4473 8962 4433
8994

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kurimski

762 
WWUS53 KGRB 241357
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
857 AM CDT Tue Aug 24 2021

WIC073-097-141-241430-
/O.CON.KGRB.SV.W.0085.000000T0000Z-210824T1430Z/
Wood WI-Portage WI-Marathon WI-
857 AM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 AM CDT
FOR WOOD...PORTAGE AND EASTERN MARATHON COUNTIES...

At 857 AM CDT, severe thunderstorms were located along a line
extending from 6 miles south of Dutch Corners to 7 miles northeast of
Weston to near Bevent to Lake Wazeecha, moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Bevent around 905 AM CDT.

Other locations in the path of these severe thunderstorms include
Whiting and Amherst.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

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

&&

LAT...LON 4467 9000 4489 8973 4512 8988 4512 8923
      4425 8923 4425 9026
TIME...MOT...LOC 1357Z 256DEG 40KT 4514 8956 4497 8943 4476 8947 4436
8979

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kurimski

536 
WWUS53 KGRB 241421
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
921 AM CDT Tue Aug 24 2021

WIC073-097-141-241430-
/O.EXP.KGRB.SV.W.0085.000000T0000Z-210824T1430Z/
Wood WI-Portage WI-Marathon WI-
921 AM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR WOOD...PORTAGE AND EASTERN
MARATHON COUNTIES WILL EXPIRE AT 930 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with these thunderstorms.

LAT...LON 4467 9000 4489 8973 4512 8988 4512 8923
      4425 8923 4425 9026
TIME...MOT...LOC 1420Z 257DEG 34KT 4519 8928 4502 8915 4481 8919 4441
8952

$$

Kurimski

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 24, 7:23 AM CDT	Special Weather Statement	GRB	Wood	52 min
Aug 24, 7:44 AM CDT	Severe Thunderstorm Warning	GRB	Marathon, Wood	76 min
Aug 24, 9:02 AM CDT	Special Weather Statement	GRB	Langlade, Menominee, Shawano, Waupaca	58 min
Aug 24, 9:24 AM CDT	Special Weather Statement	GRB	Portage	51 min
Aug 24, 9:37 AM CDT	Special Weather Statement	GRB	Portage	38 min
Aug 24, 9:45 AM CDT	Special Weather Statement	GRB	Waushara	60 min
Aug 24, 9:55 AM CDT	Special Weather Statement	GRB	Portage, Waushara, Winnebago	50 min
Aug 24, 9:58 AM CDT	Special Weather Statement	GRB	Wood	47 min
Aug 24, 10:28 AM CDT	Special Weather Statement	GRB	Marathon, Portage, Wood	47 min
Aug 24, 10:30 AM CDT	Special Weather Statement	GRB	Outagamie, Waupaca, Waushara, Winnebago	60 min
Aug 24, 11:24 AM CDT	Special Weather Statement	GRB	Menominee, Portage, Shawano, Waupaca	51 min
Aug 24, 11:28 AM CDT	Special Weather Statement	GRB	Brown, Calumet, Manitowoc, Outagamie, Waushara, Winnebago	62 min
Aug 24, 11:35 AM CDT	Severe Thunderstorm Warning	GRB	Waushara, Winnebago	25 min
Aug 24, 11:53 AM CDT	Special Marine Warning	GRB		2 hr
Aug 24, 12:05 PM CDT	Severe Thunderstorm Warning	GRB	Brown, Kewaunee, Manitowoc	25 min
Aug 24, 12:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	GRB	Manitowoc	37 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.