Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 58, NWS Green Bay, WI

July 28, 20214 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 28, 2021, 9:22 PM CDT for 4 counties in Wisconsin. It was in force for 53 min. 9 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: Jul 28, 2021, 9:22 PM CDT (02:22 UTC)
Expired: Jul 28, 2021, 10:15 PM CDT
In force: 53 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Marathon County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 85 km from the middle of the area, began a volume at 02:23 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
Jul 28, 9:50 PM CDT	TSTM WND DMG	5 N Amherst, WI	NUMEROUS TREES SNAPPED NEAR THE TOWN OF NEW HOPE. TIME ESTIMATED BY RADAR.
Jul 28, 9:55 PM CDT	TSTM WND DMG	5 Ne Amherst Junction, WI	REPORT VIA SOCIAL MEDIA, TIME ESTIMATED. MANY TREES DOWN AT THE WISCONSIN ENVIRONMENTAL STATION IN AMHERST JUNCTION.
Jul 28, 9:57 PM CDT	TSTM WND DMG	4 N Iola, WI	SEVERAL TREES DOWN. WINDS ESTIMATED AT 60 TO 65 MPH.
Jul 28, 10:14 PM CDT	TSTM WND DMG	5 W Waupaca, WI	MULTIPLE SNAPPED PINE TREES. PICTURE VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 28, 10:16 PM CDT	TSTM WND DMG	5 Ssw Waupaca, WI	SHINGLES BLOWN OFF ROOF. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 28, 10:17 PM CDT	TSTM WND DMG	2 Wsw Waupaca, WI	MULTIPLE TREES DOWN, SOME UPROOTED. FENCE BLOWN DOWN. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 28, 10:17 PM CDT	TSTM WND DMG	3 Wsw Waupaca, WI	SOME DOWNED TREES, BROKEN TREE LIMBS, AND TREE DEBRIS. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 28, 10:20 PM CDT	TSTM WND DMG	5 W Waupaca, WI	MULTIPLE SNAPPED PINE TREES. PICTURE VIA SOCIAL MEDIA
Jul 28, 10:22 PM CDT	TSTM WND DMG	5 Ssw Waupaca, WI	SHINGLES BLOWN OFF ROOF. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.

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.

Issued	Product	Office	Lasted
Jul 28, 7:17 PM CDT	Severe Thunderstorm Watch PDS	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 2.4 hours before the alert went out and 86 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: 593 J/kg
Mixed-layer CIN: -264 J/kg
Mixed-layer LCL: 1088 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

475 
WUUS53 KGRB 290222
SVRGRB
WIC073-097-115-135-290315-
/O.NEW.KGRB.SV.W.0058.210729T0222Z-210729T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
922 PM CDT Wed Jul 28 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Portage County in central Wisconsin...
  Southeastern Marathon County in central Wisconsin...
  Waupaca County in northeastern Wisconsin...
  Western Shawano County in northeastern Wisconsin...

* Until 1015 PM CDT.

* At 921 PM CDT, severe thunderstorms were located along a line
  extending from 6 miles east of Wittenberg to near Bevent, moving
  southeast at 50 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Trained weather spotters.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Amherst, Hartman Creek State Park, Chain O' Lakes-King, Waupaca 
  and New London.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Marathon County. SEEK SHELTER NOW inside a sturdy 
structure and 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 4425 8961 4488 8971 4500 8902 4496 8898
      4495 8898 4494 8897 4470 8874 4425 8874
TIME...MOT...LOC 0221Z 331DEG 44KT 4480 8905 4471 8946 

HAIL...1.00IN
WIND...70MPH
 
$$

Kurimski

5 follow-up statements

812 
WUUS53 KGRB 290223 CCA
SVRGRB
WIC073-097-115-135-290315-
/O.COR.KGRB.SV.W.0058.210729T0222Z-210729T0315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
923 PM CDT Wed Jul 28 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Portage County in central Wisconsin...
  Southeastern Marathon County in central Wisconsin...
  Waupaca County in northeastern Wisconsin...
  Western Shawano County in northeastern Wisconsin...

* Until 1015 PM CDT.

* At 923 PM CDT, severe thunderstorms were located along a line
  extending from 6 miles east of Wittenberg to near Bevent, moving
  southeast at 50 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Trained weather spotters.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations impacted include...
  Stevens Point, Waupaca, Weston, New London, Clintonville, Mosinee,
  Whiting, Bevent, Wittenberg and Amherst.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Marathon County. SEEK SHELTER NOW inside a sturdy 
structure and 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 4425 8961 4488 8971 4500 8902 4496 8898
      4495 8898 4494 8897 4470 8874 4425 8874
TIME...MOT...LOC 0223Z 331DEG 44KT 4480 8905 4471 8946 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Kurimski

978 
WWUS53 KGRB 290238
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
938 PM CDT Wed Jul 28 2021

WIC073-097-115-135-290315-
/O.CON.KGRB.SV.W.0058.000000T0000Z-210729T0315Z/
Portage WI-Marathon WI-Waupaca WI-Shawano WI-
938 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR PORTAGE...SOUTHEASTERN MARATHON...WAUPACA AND WESTERN SHAWANO
COUNTIES...

At 938 PM CDT, severe thunderstorms were located along a line
extending from 9 miles southeast of Wittenberg to 9 miles northeast
of Stevens Point, moving southeast at 40 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Stevens Point, Waupaca, New London, Clintonville, Whiting, Bevent,
Wittenberg, Amherst, Fremont and Hartman Creek State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across the area. SEEK SHELTER NOW inside a sturdy 
structure and 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 4425 8961 4469 8962 4480 8934 4486 8922
      4495 8898 4494 8897 4470 8874 4425 8874
TIME...MOT...LOC 0238Z 337DEG 33KT 4470 8908 4458 8939 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Kurimski

357 
WWUS53 KGRB 290248
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
948 PM CDT Wed Jul 28 2021

WIC073-115-290257-
/O.CAN.KGRB.SV.W.0058.000000T0000Z-210729T0315Z/
Marathon WI-Shawano WI-
948 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MARATHON AND
WESTERN SHAWANO COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
central and northeastern Wisconsin.

LAT...LON 4468 8957 4468 8874 4425 8874 4425 8951
TIME...MOT...LOC 0247Z 337DEG 33KT 4462 8904 4450 8934 

$$

WIC097-135-290315-
/O.CON.KGRB.SV.W.0058.000000T0000Z-210729T0315Z/
Portage WI-Waupaca WI-
948 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR EASTERN PORTAGE AND WAUPACA COUNTIES...

At 947 PM CDT, severe thunderstorms were located along a line
extending from 14 miles west of Clintonville to near Amherst, moving
southeast at 40 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
  Hartman Creek State Park, Chain O' Lakes-King, Waupaca, New London 
  and Fremont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across the area. SEEK SHELTER NOW inside a sturdy 
structure and 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 4468 8957 4468 8874 4425 8874 4425 8951
TIME...MOT...LOC 0247Z 337DEG 33KT 4462 8904 4450 8934 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Kurimski

906 
WWUS53 KGRB 290302 RRA
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1002 PM CDT Wed Jul 28 2021

WIC097-135-290315-
/O.CON.KGRB.SV.W.0058.000000T0000Z-210729T0315Z/
Portage WI-Waupaca WI-
1002 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT
FOR SOUTHEASTERN PORTAGE AND WAUPACA COUNTIES...

At 1002 PM CDT, severe thunderstorms were located along a line
extending from 12 miles northeast of Waupaca to near Amherst, moving
southeast at 30 mph.

HAZARD...70 mph wind gusts and quarter size hail.

SOURCE...Trained weather spotters.

IMPACT...Hail damage to vehicles is expected. Expect considerable 
         tree damage. Wind damage is also likely to mobile homes, 
         roofs, and outbuildings.

Locations impacted include...
Stevens Point, Waupaca, New London, Clintonville, Amherst, Fremont,
Chain O' Lakes-King, Hartman Creek State Park, Plover and Stockton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across Waupaca County. SEEK SHELTER NOW inside a sturdy 
structure and 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 4456 8953 4468 8874 4425 8874 4425 8943
TIME...MOT...LOC 0302Z 335DEG 28KT 4451 8897 4439 8927 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

Kurimski

584 
WWUS53 KGRB 290313
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1013 PM CDT Wed Jul 28 2021

WIC097-135-290321-
/O.EXP.KGRB.SV.W.0058.000000T0000Z-210729T0315Z/
Portage WI-Waupaca WI-
1013 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PORTAGE AND
WAUPACA COUNTIES WILL EXPIRE AT 1015 PM CDT...

A new Severe Thunderstorm Warning has been issued for southeastern 
Portage and Waupaca counties until 1115 pm. 

LAT...LON 4456 8953 4468 8874 4425 8874 4425 8943
TIME...MOT...LOC 0311Z 331DEG 44KT 4441 8890 4429 8920 

$$

Kurimski

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 28, 7:04 PM CDT	Special Weather Statement	GRB	Lincoln, Oneida, Vilas	41 min
Jul 28, 7:36 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln, Marathon	39 min
Jul 28, 7:36 PM CDT	Severe Thunderstorm Warning	GRB	Oneida	39 min
Jul 28, 7:52 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln	53 min
Jul 28, 8:20 PM CDT	Special Weather Statement	GRB	Shawano	40 min
Jul 28, 8:37 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Lincoln, Marathon, Shawano	53 min
Jul 28, 8:58 PM CDT	Tornado Warning	GRB	Marathon	32 min
Jul 28, 9:05 PM CDT	Areal Flood Advisory	GRB	Langlade, Lincoln, Marathon, Shawano	3 hr
Jul 28, 9:21 PM CDT	Tornado Warning	GRB	Marathon, Portage	24 min
Jul 28, 9:54 PM CDT	Tornado Warning	GRB	Portage, Waupaca	36 min
Jul 28, 10:10 PM CDT	Severe Thunderstorm Warning	GRB	Outagamie, Portage, Waupaca, Waushara, Winnebago	65 min
Jul 28, 10:18 PM CDT	Severe Thunderstorm Warning	GRB	Wood	43 min
Jul 28, 10:35 PM CDT	Areal Flood Advisory	GRB	Marathon, Outagamie, Portage, Shawano, Waupaca, Waushara and 1 more	3 hr
Jul 28, 11:12 PM CDT	Severe Thunderstorm Warning	GRB	Portage, Waupaca, Waushara, Winnebago	45 min
Jul 28, 11:38 PM CDT	Tornado Warning	GRB	Winnebago	16 min
Jul 29, 3:42 AM CDT	Small Craft Advisory	GRB		23 hr

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.