Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 59, NWS Green Bay, WI

July 28, 20215 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 28, 2021, 10:10 PM CDT for 5 counties in Wisconsin. It was in force for 65 min. 11 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, 10:10 PM CDT (03:10 UTC)
Expired: Jul 28, 2021, 11:15 PM CDT
In force: 65 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Outagamie County, WI, Portage County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 75 km from the middle of the area, began a volume at 03:10 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, 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.
Jul 28, 10:30 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, 11:25 PM CDT	TSTM WND DMG	1 Wnw Omro, WI	STRONG WINDS DESTROYED BARN. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 28, 11:25 PM CDT	TSTM WND DMG	3 Wnw Omro, WI	SEMI FLIPPED ON HIGHWAY 21 AND EDGEWATER RIDGE IN OMRO.
Jul 28, 11:25 PM CDT	TSTM WND DMG	Omro, WI	6 TO 12 INCH DIAMETER TREE LIMBS DOWN. LOCATED ON WEBSTER AND SCOTT STREETS IN OMRO. ESTIMATED GUSTS TO 80 MPH. TIME ESTIMATED BY RADAR.
Jul 28, 11:25 PM CDT	TSTM WND GST 65	2 N Redgranite, 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.

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, 3.2 hours before the alert went out and 74 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.

015 
WUUS53 KGRB 290310
SVRGRB
WIC087-097-135-137-139-290415-
/O.NEW.KGRB.SV.W.0059.210729T0310Z-210729T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1010 PM CDT Wed Jul 28 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Southeastern Portage County in central Wisconsin...
  Winnebago County in east central Wisconsin...
  Eastern Waushara County in central Wisconsin...
  Waupaca County in northeastern Wisconsin...
  Southwestern Outagamie County in northeastern Wisconsin...

* Until 1115 PM CDT.

* At 1010 PM CDT, severe thunderstorms were located along a line
  extending from 10 miles northeast of Waupaca to Hartman Creek State
  Park, moving southeast 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.

* Severe thunderstorms will be near...
  Waupaca around 1025 PM CDT.
  New London around 1030 PM CDT.

Other locations in the path of these severe thunderstorms include
Napowan Scout Camp, Fremont, Redgranite, Lake Poygan, Oshkosh and
Rush Lake.

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.

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

&&

LAT...LON 4398 8889 4398 8918 4447 8942 4463 8887
      4399 8840 4389 8840 4389 8888
TIME...MOT...LOC 0310Z 335DEG 28KT 4447 8894 4435 8924 

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

Kurimski

4 follow-up statements

473 
WWUS53 KGRB 290325
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1025 PM CDT Wed Jul 28 2021

WIC097-290335-
/O.CAN.KGRB.SV.W.0059.000000T0000Z-210729T0415Z/
Portage WI-
1025 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PORTAGE COUNTY 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, northeastern and east central Wisconsin.

LAT...LON 4398 8889 4398 8918 4424 8924 4425 8923
      4438 8922 4449 8877 4399 8840 4389 8841
      4389 8888
TIME...MOT...LOC 0325Z 335DEG 28KT 4437 8887 4425 8917 

$$

WIC087-135-137-139-290415-
/O.CON.KGRB.SV.W.0059.000000T0000Z-210729T0415Z/
Winnebago WI-Waushara WI-Waupaca WI-Outagamie WI-
1025 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR WINNEBAGO...EASTERN WAUSHARA...SOUTHERN WAUPACA AND SOUTHWESTERN
OUTAGAMIE COUNTIES...

At 1025 PM CDT, severe thunderstorms were located along a line
extending from 6 miles west of New London to near Hartman Creek State
Park, moving southeast 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.

These severe storms will be near...
  New London around 1030 PM CDT.

Other locations in the path of these severe thunderstorms include
Napowan Scout Camp, Fremont, Redgranite, Lake Poygan, Oshkosh and
Rush Lake.

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.

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

&&

LAT...LON 4398 8889 4398 8918 4424 8924 4425 8923
      4438 8922 4449 8877 4399 8840 4389 8841
      4389 8888
TIME...MOT...LOC 0325Z 335DEG 28KT 4437 8887 4425 8917 

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

Kurimski

761 
WWUS53 KGRB 290340
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1040 PM CDT Wed Jul 28 2021

WIC087-135-137-139-290415-
/O.CON.KGRB.SV.W.0059.000000T0000Z-210729T0415Z/
Winnebago WI-Waushara WI-Waupaca WI-Outagamie WI-
1040 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR WINNEBAGO...EASTERN WAUSHARA...SOUTHERN WAUPACA AND SOUTHWESTERN
OUTAGAMIE COUNTIES...

At 1040 PM CDT, severe thunderstorms were located along a line
extending from near Fremont to near Napowan Scout Camp, moving
southeast at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Redgranite, Lake Poygan, Oshkosh and Rush Lake.

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.

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

&&

LAT...LON 4398 8889 4398 8918 4424 8924 4425 8923
      4431 8914 4440 8870 4399 8840 4389 8841
      4389 8888
TIME...MOT...LOC 0340Z 335DEG 28KT 4427 8880 4415 8910 

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

Kurimski

358 
WWUS53 KGRB 290353
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1053 PM CDT Wed Jul 28 2021

WIC087-135-290403-
/O.CAN.KGRB.SV.W.0059.000000T0000Z-210729T0415Z/
Waupaca WI-Outagamie WI-
1053 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WAUPACA AND
SOUTHWESTERN OUTAGAMIE 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 east central Wisconsin.

LAT...LON 4398 8889 4398 8918 4424 8924 4424 8858
      4399 8840 4389 8841 4389 8888
TIME...MOT...LOC 0353Z 337DEG 18KT 4419 8874 4411 8909 

$$

WIC137-139-290415-
/O.CON.KGRB.SV.W.0059.000000T0000Z-210729T0415Z/
Winnebago WI-Waushara WI-
1053 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR WINNEBAGO AND EASTERN WAUSHARA COUNTIES...

At 1053 PM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Lake Poygan to near Napowan Scout
Camp, moving southeast at 20 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Oshkosh and Rush Lake.

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.

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

&&

LAT...LON 4398 8889 4398 8918 4424 8924 4424 8858
      4399 8840 4389 8841 4389 8888
TIME...MOT...LOC 0353Z 337DEG 18KT 4419 8874 4411 8909 

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

Kurimski

487 
WWUS53 KGRB 290417
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1117 PM CDT Wed Jul 28 2021

WIC137-139-290427-
/O.EXP.KGRB.SV.W.0059.000000T0000Z-210729T0415Z/
Winnebago WI-Waushara WI-
1117 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR WINNEBAGO AND EASTERN WAUSHARA
COUNTIES HAS EXPIRED...

A new Severe Thunderstorm Warning has been issued for Winnebago and 
Waushara counties until 1245 am.

LAT...LON 4398 8889 4398 8918 4424 8924 4424 8858
      4399 8840 4389 8841 4389 8888
TIME...MOT...LOC 0417Z 335DEG 28KT 4402 8863 4394 8898 

$$

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, 9:22 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Portage, Shawano, Waupaca	53 min
Jul 28, 9:54 PM CDT	Tornado Warning	GRB	Portage, Waupaca	36 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.