Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 88, NWS Green Bay, WI

August 24, 2021Manitowoc County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Aug 24, 2021, 12:23 PM CDT for Manitowoc County, Wisconsin. It was in force for 37 min. 4 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, 12:23 PM CDT (17:23 UTC)
Expired: Aug 24, 2021, 1:00 PM CDT
In force: 37 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 50.0 mph

County Manitowoc County, WI

The radar

The Green Bay radar (KGRB), 47 km from the middle of the area, began a volume at 17:24 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
Aug 24, 12:34 PM CDT	TSTM WND GST 45	Manitowoc, WI	39 KNOTS MEASURED AT THE MANITOWOC AIRPORT.
Aug 24, 12:36 PM CDT	TSTM WND DMG	Manitowoc, WI	TREES DOWN IN THE CITY OF MANITOWOC.
Aug 24, 12:39 PM CDT	TSTM WND GST 47	Manitowoc, WI	41 KNOTS MEASURED AT THE MANITOWOC AIRPORT.
Aug 24, 12:42 PM CDT	TSTM WND GST 47	Manitowoc, 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, 5.4 hours before the alert went out and 45 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.

888 
WUUS53 KGRB 241723
SVRGRB
WIC071-241815-
/O.NEW.KGRB.SV.W.0088.210824T1723Z-210824T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1223 PM CDT Tue Aug 24 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Manitowoc County in east central Wisconsin...

* Until 115 PM CDT.

* At 1222 PM CDT, severe thunderstorms were located along a line
  extending from near Denmark to 8 miles southwest of Two Creeks to 6
  miles northwest of Manitowoc to 6 miles north of Cleveland to near
  Elkhart Lake, moving east at 25 mph.

  HAZARD...Golf ball size hail.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect 
           damage to roofs, siding, windows, and vehicles.

* Locations impacted include...
  Manitowoc, Cleveland, Valders, St. Nazianz, Two Creeks, Camp
  Rokilio Scout Camp, Two Rivers, Kiel, Newton and Cato.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are likely producing large hail. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows!

&&

LAT...LON 4398 8804 4402 8799 4418 8798 4421 8789
      4433 8787 4433 8754 4438 8752 4441 8751
      4441 8745 4433 8748 4418 8746 4407 8760
      4390 8769 4389 8804
TIME...MOT...LOC 1722Z 273DEG 24KT 4432 8773 4422 8771 4417 8777 4401
8778 4387 8803

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Kieckbusch

4 follow-up statements

781 
WWUS53 KGRB 241731
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1231 PM CDT Tue Aug 24 2021

WIC071-241815-
/O.CON.KGRB.SV.W.0088.000000T0000Z-210824T1815Z/
Manitowoc WI-
1231 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM CDT
FOR MANITOWOC COUNTY...

At 1230 PM CDT, severe thunderstorms were located along a line
extending from 6 miles west of Two Creeks to 11 miles southeast of
Denmark to near Manitowoc to near Cleveland to near Elkhart Lake, 
moving east at 25 mph. Very large hail was likely occurring between 
Cooperstown and Larrabee, and between Branch and Shoto.

HAZARD...Golf ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
Manitowoc, Cleveland, Valders, St. Nazianz, Two Creeks, Camp Rokilio
Scout Camp, Two Rivers, Kiel, Newton and Cato.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows.

&&

LAT...LON 4398 8804 4402 8799 4420 8786 4433 8782
      4433 8754 4438 8752 4441 8751 4441 8745
      4432 8748 4418 8746 4407 8760 4390 8769
      4389 8804
TIME...MOT...LOC 1730Z 271DEG 22KT 4432 8768 4422 8768 4416 8772 4399
8777 4387 8798

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Kieckbusch

001 
WWUS53 KGRB 241739
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1239 PM CDT Tue Aug 24 2021

WIC071-241815-
/O.CON.KGRB.SV.W.0088.000000T0000Z-210824T1815Z/
Manitowoc WI-
1239 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM CDT
FOR MANITOWOC COUNTY...

At 1239 PM CDT, severe thunderstorms were located along a line
extending from near Two Creeks to 15 miles southeast of Denmark to
near Manitowoc to 6 miles northeast of Cleveland to near Howards
Grove, moving east at 25 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.

Locations impacted include...
Manitowoc, Cleveland, Valders, St. Nazianz, Two Creeks, Camp Rokilio
Scout Camp, Two Rivers, Kiel, Newton and Mishicot.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Green Bay.

&&

LAT...LON 4398 8804 4408 8787 4419 8780 4433 8775
      4433 8754 4438 8752 4441 8751 4441 8745
      4433 8748 4418 8746 4407 8760 4390 8769
      4389 8804
TIME...MOT...LOC 1739Z 271DEG 22KT 4432 8758 4422 8758 4416 8762 4399
8767 4387 8788

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

$$

Kieckbusch

516 
WWUS53 KGRB 241749
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1249 PM CDT Tue Aug 24 2021

WIC071-241815-
/O.CON.KGRB.SV.W.0088.000000T0000Z-210824T1815Z/
Manitowoc WI-
1249 PM CDT Tue Aug 24 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 115 PM CDT
FOR CENTRAL MANITOWOC COUNTY...

At 1248 PM CDT, severe thunderstorms were located along a line 
extending from near Two Creeks to Manitowoc to Cleveland to Howards 
Grove, 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.

Locations impacted include...
Manitowoc, Cleveland, Two Creeks, Camp Rokilio Scout Camp, Two
Rivers, Newton, Mishicot, Spring Valley, Francis Creek and Clover.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Green Bay.

&&

LAT...LON 4398 8794 4404 8775 4416 8771 4433 8768
      4433 8754 4438 8752 4441 8751 4441 8745
      4432 8748 4418 8746 4407 8760 4390 8769
      4389 8799 4389 8800
TIME...MOT...LOC 1748Z 290DEG 28KT 4431 8750 4421 8750 4409 8751 4398
8759 4384 8785

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

$$
Kieckbusch

929 
WWUS53 KGRB 241800
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
100 PM CDT Tue Aug 24 2021

WIC071-241810-
/O.CAN.KGRB.SV.W.0088.000000T0000Z-210824T1815Z/
Manitowoc WI-
100 PM CDT Tue Aug 24 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MANITOWOC COUNTY IS
CANCELLED...
    
The storms which prompted the warning have weakened below severe 
limits, and are exiting the warned area. Therefore, the warning has 
been cancelled.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Green Bay.

LAT...LON 4398 8794 4404 8775 4416 8771 4433 8768
      4433 8754 4438 8752 4441 8751 4441 8745
      4432 8748 4418 8746 4407 8760 4390 8769
      4389 8799 4389 8800
TIME...MOT...LOC 1758Z 273DEG 24KT 4431 8742 4421 8742 4409 8743 4398
8751 4384 8777

$$

Kieckbusch

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, 8:27 AM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Wood	63 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

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.