Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 61, NWS Green Bay, WI

July 28, 20214 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 28, 2021, 11:12 PM CDT for 4 counties in Wisconsin. It was in force for 45 min. 13 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, 11:12 PM CDT (04:12 UTC)
Expired: Jul 28, 2021, 11:57 PM CDT
In force: 45 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 70.0 mph

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

The radar

The Green Bay radar (KGRB), 81 km from the middle of the area, began a volume at 04:12 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, 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
Jul 28, 11:27 PM CDT	TSTM WND DMG	1 Ne Waukau, WI	NUMEROUS TREES SNAPPED AND UPROOTED BETWEEN OMRO AND WAUKAU. ESTIMATED WINDS AROUND 80 MPH
Jul 28, 11:27 PM CDT	TSTM WND GST 72	Omro, WI
Jul 28, 11:30 PM CDT	TSTM WND DMG	1 Ne Waukau, WI	MULTIPLE TREES AND BRANCHES DOWN. MINOR DAMAGE TO HOUSE FROM THE TREES AND BRANCHES. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jul 28, 11:32 PM CDT	TSTM WND DMG	3 Nnw Eureka, WI	TREE BRANCHES DOWN ON HIGHWAY 21. WINDS ESTIMATED AT 60 TO 70 MPH.
Jul 28, 11:32 PM CDT	TSTM WND GST 37	Oshkosh, WI
Jul 28, 11:33 PM CDT	TSTM WND DMG	Omro, WI	NUMEROUS TREES AND POWER LINES DOWN.
Jul 28, 11:35 PM CDT	TSTM WND DMG	Eureka, WI	NUMEROUS TREES BLOCKING ROAD ON COUNTY K AND COUNTY E IN EUREKA.
Jul 28, 11:35 PM CDT	TSTM WND DMG	Eureka, WI	NUMEROUS TREES BLOCKING ROAD ON COUNTY K AND COUNTY E NEAR EUREKA.
Jul 28, 11:40 PM CDT	FUNNEL CLOUD	4 Nne Rush Lake, WI	PUBLIC REPORTED A FUNNEL CLOUD BETWEEN HIGHWAY 91 AND RUSH LAKE ROAD. RELAYED VIA EMERGENCY MANAGEMENT

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, 4.2 hours before the alert went out and 81 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.

502 
WUUS53 KGRB 290412
SVRGRB
WIC097-135-137-139-290545-
/O.NEW.KGRB.SV.W.0061.210729T0412Z-210729T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1112 PM CDT Wed Jul 28 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Southern Portage County in central Wisconsin...
  Winnebago County in east central Wisconsin...
  Waushara County in central Wisconsin...
  Southern Waupaca County in northeastern Wisconsin...

* Until 1245 AM CDT.

* At 1112 PM CDT, severe thunderstorms were located along a line
  extending from 7 miles southeast of Lake Wazeecha to near Napowan
  Scout Camp to near Oshkosh, moving southeast at 15 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Oshkosh around 1115 PM CDT.
  Redgranite around 1125 PM CDT.

Other locations in the path of these severe thunderstorms include
Plainfield 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 8960 4424 8960 4425 8972
      4442 8972 4444 8884 4433 8873 4425 8874
      4424 8864 4399 8840 4389 8840 4389 8888
TIME...MOT...LOC 0412Z 320DEG 14KT 4429 8965 4411 8914 4401 8863 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Kurimski

4 follow-up statements

689 
WWUS53 KGRB 290426
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1126 PM CDT Wed Jul 28 2021

WIC097-135-290435-
/O.CAN.KGRB.SV.W.0061.000000T0000Z-210729T0545Z/
Portage WI-Waupaca WI-
1126 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN PORTAGE AND SOUTHERN
WAUPACA 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 8960 4424 8960 4424 8864
      4399 8840 4389 8840 4389 8888
TIME...MOT...LOC 0425Z 320DEG 14KT 4425 8960 4407 8909 4397 8858 

$$

WIC137-139-290545-
/O.CON.KGRB.SV.W.0061.000000T0000Z-210729T0545Z/
Winnebago WI-Waushara WI-
1126 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR WINNEBAGO AND WAUSHARA COUNTIES...

At 1125 PM CDT, severe thunderstorms were located along a line
extending from near Plainfield to Redgranite to near Oshkosh, moving
southeast at 15 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Oshkosh, Wautoma, Redgranite, Plainfield, Napowan Scout Camp, Lake
Poygan, Rush Lake, Central Lake Winnebago, Omro and Silver 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 8960 4424 8960 4424 8864
      4399 8840 4389 8840 4389 8888
TIME...MOT...LOC 0425Z 320DEG 14KT 4425 8960 4407 8909 4397 8858 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...70MPH
 
$$

Kurimski

610 
WWUS53 KGRB 290438
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1138 PM CDT Wed Jul 28 2021

WIC137-139-290545-
/O.CON.KGRB.SV.W.0061.000000T0000Z-210729T0545Z/
Winnebago WI-Waushara WI-
1138 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR WINNEBAGO AND SOUTHEASTERN WAUSHARA COUNTIES...

At 1137 PM CDT, a severe thunderstorm was located over Rush Lake, or
near Ripon, moving southeast at 35 mph.

This is a very dangerous storm.

HAZARD...80 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

Locations impacted include...
Oshkosh, Rush Lake, Central Lake Winnebago, Omro, Winneconne, Eureka,
Pickett, Butte Des Morts, Lake Butte Des Morts and Rivermoor.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4398 8889 4398 8911 4417 8883 4416 8856
      4399 8840 4389 8840 4389 8888
TIME...MOT...LOC 0437Z 319DEG 31KT 4392 8878 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...80MPH
 
$$

Kurimski

694 
WWUS53 KGRB 290447
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1147 PM CDT Wed Jul 28 2021

WIC137-290457-
/O.CAN.KGRB.SV.W.0061.000000T0000Z-210729T0545Z/
Waushara WI-
1147 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WAUSHARA COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4398 8889 4403 8881 4404 8845 4399 8840
      4389 8840 4389 8888
TIME...MOT...LOC 0447Z 319DEG 28KT 4389 8874 

$$

WIC139-290545-
/O.CON.KGRB.SV.W.0061.000000T0000Z-210729T0545Z/
Winnebago WI-
1147 PM CDT Wed Jul 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR SOUTHERN WINNEBAGO COUNTY...

At 1147 PM CDT, a severe thunderstorm was located near Rush Lake, or
near Ripon, moving southeast at 35 mph.

This is a very dangerous storm.

HAZARD...80 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

Locations impacted include...
Oshkosh, Rush Lake, Central Lake Winnebago, Omro, Eureka, Pickett,
Eaa, Ford Festival Grounds, Black Wolf Point and Ring.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4398 8889 4403 8881 4404 8845 4399 8840
      4389 8840 4389 8888
TIME...MOT...LOC 0447Z 319DEG 28KT 4389 8874 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...80MPH
 
$$

Kurimski

515 
WWUS53 KGRB 290457
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1157 PM CDT Wed Jul 28 2021

WIC139-290507-
/O.CAN.KGRB.SV.W.0061.000000T0000Z-210729T0545Z/
Winnebago WI-
1157 PM CDT Wed Jul 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN WINNEBAGO COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

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

LAT...LON 4398 8889 4403 8881 4404 8845 4399 8840
      4389 8840 4389 8888
TIME...MOT...LOC 0455Z 320DEG 14KT 4386 8871 

$$

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, 10:10 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, 11:38 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.