Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 2, NWS Green Bay, WI

July 28, 2021Marathon County, Portage County, Wisconsin

NWS Green Bay, WI issued this tornado warning at Jul 28, 2021, 9:21 PM CDT for Marathon County, Portage County, Wisconsin. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 28, 2021, 9:21 PM CDT (02:21 UTC)
Expired: Jul 28, 2021, 9:45 PM CDT
In force: 24 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Marathon County, WI, Portage County, WI

The radar

The Green Bay radar (KGRB), 103 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.

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 104 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.

163 
WFUS53 KGRB 290221
TORGRB
WIC073-097-290245-
/O.NEW.KGRB.TO.W.0002.210729T0221Z-210729T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
921 PM CDT Wed Jul 28 2021

The National Weather Service in Green Bay has issued a

* Tornado Warning for...
  Northeastern Portage County in central Wisconsin...
  Southeastern Marathon County in central Wisconsin...

* Until 945 PM CDT.
    
* At 921 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Bevent, or 16 miles north of Stevens Point, moving
  southeast at 40 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This tornadic thunderstorm will remain over mainly rural areas of
  northeastern Portage and southeastern Marathon Counties, including
  the following locations... North Star, Galloway, Rosholt,
  Shantytown, Holt and Polonia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 4475 8952 4481 8938 4468 8922 4464 8922
      4455 8941
TIME...MOT...LOC 0221Z 330DEG 34KT 4474 8943 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

EB

3 follow-up statements

923 
WWUS53 KGRB 290230
SVSGRB

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

WIC073-097-290245-
/O.CON.KGRB.TO.W.0002.000000T0000Z-210729T0245Z/
Portage WI-Marathon WI-
930 PM CDT Wed Jul 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR
NORTHEASTERN PORTAGE AND SOUTHEASTERN MARATHON COUNTIES...
    
At 929 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Bevent, or 13 miles northeast of Stevens Point,
moving southeast at 40 mph.

HAZARD...Tornado and half dollar size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
northeastern Portage and southeastern Marathon Counties, including
the following locations... North Star, Galloway, Rosholt, Shantytown,
Holt and Polonia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

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

&&

LAT...LON 4472 8950 4479 8935 4468 8922 4464 8922
      4455 8941
TIME...MOT...LOC 0229Z 330DEG 34KT 4467 8937 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

EB

096 
WWUS53 KGRB 290235
SVSGRB

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

WIC073-290245-
/O.CAN.KGRB.TO.W.0002.000000T0000Z-210729T0245Z/
Marathon WI-
935 PM CDT Wed Jul 28 2021

...THE TORNADO WARNING FOR SOUTHEASTERN MARATHON COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning 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 4465 8947 4466 8947 4468 8943 4468 8922
      4464 8922 4455 8941
TIME...MOT...LOC 0235Z 330DEG 34KT 4462 8933 

$$

WIC097-290245-
/O.CON.KGRB.TO.W.0002.000000T0000Z-210729T0245Z/
Portage WI-
935 PM CDT Wed Jul 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR
NORTHEASTERN PORTAGE COUNTY...
    
At 935 PM CDT, a severe thunderstorm capable of producing a tornado
was located 9 miles south of Bevent, or 12 miles northeast of Stevens
Point, moving southeast at 40 mph.

HAZARD...Tornado and half dollar size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

Locations impacted include...
Rosholt, North Star and Polonia. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

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

&&

LAT...LON 4465 8947 4466 8947 4468 8943 4468 8922
      4464 8922 4455 8941
TIME...MOT...LOC 0235Z 330DEG 34KT 4462 8933 

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

EB

326 
WWUS53 KGRB 290245
SVSGRB

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

WIC097-290254-
/O.EXP.KGRB.TO.W.0002.000000T0000Z-210729T0245Z/
Portage WI-
945 PM CDT Wed Jul 28 2021

...THE TORNADO WARNING FOR NORTHEASTERN PORTAGE COUNTY WILL EXPIRE AT
945 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

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

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

Remember, a Severe Thunderstorm Warning remains in effect for 
Portage County.

LAT...LON 4465 8947 4466 8947 4468 8943 4468 8922
      4464 8922 4455 8941
TIME...MOT...LOC 0244Z 330DEG 34KT 4455 8927 

$$

EB

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, 9:22 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, 11:12 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

Tornado Warnings in Wisconsin, 2021 Every tornado warning in 2021 Tornadoes 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.