Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 98, NWS Green Bay, WI

December 15, 20216 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Dec 15, 2021, 9:55 PM CST for 6 counties in Wisconsin. It was in force for 65 min. 10 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: Dec 15, 2021, 9:55 PM CST (03:55 UTC)
Expired: Dec 15, 2021, 11:00 PM CST
In force: 65 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Langlade County, WI, Lincoln County, WI, Marathon County, WI, Portage County, WI, Waushara County, WI, Wood County, WI

The radar

The Green Bay radar (KGRB), 124 km from the middle of the area, began a volume at 03:56 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
Dec 15, 10:10 PM CST	TSTM WND DMG	Marathon City, WI	SEVERAL TREES DOWN IN MARATHON CITY
Dec 15, 10:14 PM CST	TSTM WND GST 69	Wisconsin Rapids, WI
Dec 15, 10:23 PM CST	TSTM WND DMG	Plainfield, WI	SEVERAL TREES AND POWER POLES/LINES DOWN ON COUNTY RD P AT COUNTY RD J. SOCIAL MEDIA REPORT FROM WSAW-TV. TIME ESTIMATED.
Dec 15, 10:23 PM CST	TSTM WND GST 56	Wausau, WI
Dec 15, 10:25 PM CST	TSTM WND DMG	6 Nnw Wausau, WI	SHINGLE AND SIDING DAMAGE TO HOME. TIME ESTIMATED BY RADAR.
Dec 15, 10:25 PM CST	TSTM WND DMG	Stevens Point, WI	EXTENSIVE DAMAGE TO HOUSE. MANY LARGE BRANCHES AND TREES DOWN. POWER POLE SNAPPED.
Dec 15, 10:28 PM CST	TSTM WND GST 46	Stevens Point, WI
Dec 15, 10:37 PM CST	TSTM WND GST 39	Stevens Point, WI
Dec 15, 10:37 PM CST	TSTM WND GST 52	Stevens Point, WI
Dec 15, 10:50 PM CST	TSTM WND DMG	1 E Antigo, WI	REPORT FROM MPING.

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
Dec 15, 5:30 PM CST	Tornado Watch	SPC	6 hr
Dec 15, 9:44 PM CST	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 3.9 hours before the alert went out and 126 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: 29 J/kg
Mixed-layer CIN: -469 J/kg
Mixed-layer LCL: 505 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 689 m²/s²
0-3 km storm-relative helicity: 687 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

597 
WUUS53 KGRB 160355
SVRGRB
WIC067-069-073-097-137-141-160500-
/O.NEW.KGRB.SV.W.0098.211216T0355Z-211216T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
955 PM CST Wed Dec 15 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Eastern Wood County in central Wisconsin...
  Portage County in central Wisconsin...
  Lincoln County in north central Wisconsin...
  Marathon County in central Wisconsin...
  Western Waushara County in central Wisconsin...
  Western Langlade County in north central Wisconsin...

* Until 1100 PM CST.

* At 954 PM CST, severe thunderstorms were located along a line
  extending from near Rib Lake to 15 miles east of Colby to near
  Babcock to near New Lisbon, moving northeast at 60 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...
  New Wood Wildlife Area around 1005 PM CST.
  Wausau, Wisconsin Rapids, Lake Wazeecha and Tripoli around 1010 PM 
  CST.

Other locations in the path of these severe thunderstorms include Rib
Mountain, Tomahawk, Gilbert, Stevens Point, Whiting, Dutch Corners,
Plainfield, Veterans Memorial County Park and Amherst.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

A Tornado Watch remains in effect until 1100 PM CST for central
Wisconsin.

&&

LAT...LON 4425 8960 4425 9007 4485 9002 4512 9008
      4512 9007 4556 9004 4556 8943 4547 8942
      4547 8915 4537 8908 4503 8913 4503 8922
      4398 8925 4398 8960
TIME...MOT...LOC 0354Z 235DEG 45KT 4534 9016 4489 9001 4429 9004 4393
9014

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Kallas

4 follow-up statements

024 
WWUS53 KGRB 160411
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1011 PM CST Wed Dec 15 2021

WIC067-069-073-097-137-141-160500-
/O.CON.KGRB.SV.W.0098.000000T0000Z-211216T0500Z/
Wood WI-Portage WI-Lincoln WI-Marathon WI-Waushara WI-Langlade WI-
1011 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CST
FOR EASTERN WOOD...PORTAGE...LINCOLN...MARATHON...WESTERN WAUSHARA
AND WESTERN LANGLADE COUNTIES...

At 1010 PM CST, severe thunderstorms were located along a line
extending from 6 miles southeast of New Wood Wildlife Area to 7 miles
northwest of Wausau to 7 miles northeast of Wisconsin Rapids to 6
miles south of New Rome to near Wisconsin Dells, moving northeast at
60 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

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

These severe storms will be near...
  Wausau, Merrill, Rib Mountain, Birch Trails Girl Scout Camp and 
  Council Grounds State Park around 1015 PM CST.

Other locations in the path of these severe thunderstorms include
Whiting, Stevens Point, Gilbert, Dutch Corners, Harrison, Bevent,
Parrish, Amherst, Wautoma and Veterans Memorial County Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for central
Wisconsin.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4425 8960 4425 8999 4483 8987 4512 8992
      4556 9004 4556 8943 4547 8942 4547 8915
      4537 8908 4503 8913 4503 8922 4398 8925
      4398 8960
TIME...MOT...LOC 0410Z 228DEG 53KT 4524 8984 4501 8977 4449 8977 4414
8988 4370 8983

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Kallas

945 
WWUS53 KGRB 160426
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1026 PM CST Wed Dec 15 2021

WIC067-069-073-097-137-141-160500-
/O.CON.KGRB.SV.W.0098.000000T0000Z-211216T0500Z/
Wood WI-Portage WI-Lincoln WI-Marathon WI-Waushara WI-Langlade WI-
1026 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CST
FOR SOUTHEASTERN WOOD...PORTAGE...LINCOLN...EASTERN MARATHON...
WESTERN WAUSHARA AND WESTERN LANGLADE COUNTIES...

At 1023 PM CST, severe thunderstorms were located along a line
extending from Gilbert to near Dutch Corners to 7 miles east of
Mosinee to near Lake Wazeecha to 6 miles west of Westfield, moving 
northeast at 70 mph. A 69 mph wind gust was reported at the airport 
in Wisconsin Rapids. 

HAZARD...70 mph wind gusts.

SOURCE...Broadcast media.

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

These severe storms will be near...
  Weston, Tomahawk, Harrison and Dutch Corners around 1030 PM CST.

Other locations in the path of these severe thunderstorms include
Stevens Point, Wautoma, Parrish, Plainfield, Antigo, Bevent and
Veterans Memorial County Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for central
Wisconsin.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4425 8960 4425 8980 4481 8971 4513 8972
      4556 8988 4556 8943 4547 8942 4547 8915
      4537 8908 4503 8913 4503 8922 4398 8925
      4398 8960
TIME...MOT...LOC 0423Z 216DEG 76KT 4541 8969 4520 8956 4476 8954 4434
8970 4389 8962

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Kallas

758 
WWUS53 KGRB 160449
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1049 PM CST Wed Dec 15 2021

WIC069-073-141-160458-
/O.CAN.KGRB.SV.W.0098.000000T0000Z-211216T0500Z/
Wood WI-Lincoln WI-Marathon WI-
1049 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WOOD...LINCOLN
AND EASTERN MARATHON COUNTIES IS CANCELLED...

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

A Tornado Watch remains in effect until 1100 PM CST for central
Wisconsin.

A Severe Thunderstorm Watch remains in effect until 100 AM CST for
north central and northeastern Wisconsin.

LAT...LON 4424 8960 4425 8973 4451 8973 4451 8976
      4468 8973 4468 8925 4512 8922 4512 8943
      4547 8942 4547 8915 4537 8908 4503 8913
      4503 8922 4501 8922 4398 8925 4398 8960
TIME...MOT...LOC 0448Z 235DEG 45KT 4558 8935 4537 8922 4493 8920 4451
8936 4406 8928

$$

WIC067-097-137-160500-
/O.CON.KGRB.SV.W.0098.000000T0000Z-211216T0500Z/
Portage WI-Waushara WI-Langlade WI-
1049 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CST
FOR PORTAGE...WESTERN WAUSHARA AND WESTERN LANGLADE COUNTIES...

At 1048 PM CST, severe thunderstorms were located along a line
extending from near Rhinelander to 6 miles northwest of Veterans
Memorial County Park to 7 miles north of Wittenberg to near Amherst
to Wautoma, moving northeast at 60 mph.

HAZARD...70 mph wind gusts.

SOURCE...Broadcast media.

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

Locations impacted include...
  Veterans Memorial County Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for central
Wisconsin.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. These storms may cause serious injury and significant
property damage.

&&

LAT...LON 4424 8960 4425 8973 4451 8973 4451 8976
      4468 8973 4468 8925 4512 8922 4512 8943
      4547 8942 4547 8915 4537 8908 4503 8913
      4503 8922 4501 8922 4398 8925 4398 8960
TIME...MOT...LOC 0448Z 235DEG 45KT 4558 8935 4537 8922 4493 8920 4451
8936 4406 8928

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Kallas

482 
WWUS53 KGRB 160455
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1055 PM CST Wed Dec 15 2021

WIC067-097-137-160504-
/O.EXP.KGRB.SV.W.0098.000000T0000Z-211216T0500Z/
Portage WI-Waushara WI-Langlade WI-
1055 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR PORTAGE...WESTERN WAUSHARA AND
WESTERN LANGLADE COUNTIES WILL EXPIRE AT 1100 PM CST...
    
The storms which prompted the warning have weakened below severe
limits, and have exited the warned area. Therefore, the warning will 
be allowed to expire.  However, gusty winds are still possible with 
these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 100 AM CST for 
north central and northeastern Wisconsin.

Remember, a Severe Thunderstorm Warning still remains in effect for
Langlade County!

LAT...LON 4424 8960 4425 8973 4451 8973 4451 8976
      4468 8973 4468 8925 4512 8922 4512 8943
      4547 8942 4547 8915 4537 8908 4503 8913
      4503 8922 4501 8922 4398 8925 4398 8960
TIME...MOT...LOC 0454Z 235DEG 45KT 4562 8927 4541 8914 4497 8912 4455
8928 4410 8921

$$

Kallas

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 15, 9:06 PM CST	Severe Thunderstorm Warning Considerable damage threat	GRB	Marathon, Wood	54 min
Dec 15, 10:45 PM CST	Severe Thunderstorm Warning Considerable damage threat	GRB	Forest, Langlade, Menominee, Oconto, Oneida, Shawano and 1 more	45 min
Dec 16, 3:28 AM CST	Gale Warning	GRB		16 hr
Dec 16, 8:09 AM CST	Wind Advisory	GRB	Brown, Calumet, Door, Florence, Forest, Kewaunee and 16 more	9 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.