Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 99, NWS Green Bay, WI

December 15, 20217 counties in Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Dec 15, 2021, 10:45 PM CST for 7 counties in Wisconsin. It was in force for 45 min. 2 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, 10:45 PM CST (04:45 UTC)
Expired: Dec 15, 2021, 11:30 PM CST
In force: 45 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 Forest County, WI, Langlade County, WI, Menominee County, WI, Oconto County, WI, Oneida County, WI, Shawano County, WI, Waupaca County, WI

The radar

The Green Bay radar (KGRB), 102 km from the middle of the area, began a volume at 04:43 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, 10:50 PM CST	TSTM WND DMG	1 E Antigo, WI	REPORT FROM MPING.
Dec 15, 10:50 PM CST	TSTM WND DMG	Pelican Lake, WI	POWER LINES AND TREES DOWN. DAMAGE AND POWER OUTAGES WERE REPORTED ALONG HIGHWAY 8 FROM NEAR CRESCENT TO PELICAN LAKE.

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, 9:44 PM CST	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 4.8 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: 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.

004 
WUUS53 KGRB 160445
SVRGRB
WIC041-067-078-083-085-115-135-160530-
/O.NEW.KGRB.SV.W.0099.211216T0445Z-211216T0530Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1045 PM CST Wed Dec 15 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Southern Forest County in northeastern Wisconsin...
  Southeastern Oneida County in north central Wisconsin...
  Menominee County in northeastern Wisconsin...
  Northwestern Waupaca County in northeastern Wisconsin...
  Northern Oconto County in northeastern Wisconsin...
  Langlade County in north central Wisconsin...
  Western Shawano County in northeastern Wisconsin...

* Until 1130 PM CST.

* At 1045 PM CST, severe thunderstorms were located along a line
  extending from 10 miles northeast of Parrish to near Veterans
  Memorial County Park to 10 miles north of Wittenberg to 10 miles
  south of Bevent, moving northeast at 65 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...
  Antigo and Veterans Memorial County Park around 1050 PM CST.
  Ma Ka Ja Wan Scout Reservation and Pearson around 1055 PM CST.
  Crandon, Woodlawn and Neopit around 1100 PM CST.
  White Lake around 1105 PM CST.

Other locations in the path of these severe thunderstorms include
Gardner Dam Scout Camp, Mountain, Keshena, McCaslin Mountain Natural
Area, Big Smokey Falls, South Branch and Legend Lake.

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.

&&

LAT...LON 4512 8922 4512 8928 4527 8929 4550 8934
      4564 8843 4537 8843 4485 8849 4455 8922
TIME...MOT...LOC 0445Z 236DEG 56KT 4549 8921 4533 8917 4498 8916 4461
8934

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

2 follow-up statements

368 
WWUS53 KGRB 160508
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1108 PM CST Wed Dec 15 2021

WIC085-160518-
/O.CAN.KGRB.SV.W.0099.000000T0000Z-211216T0530Z/
Oneida WI-
1108 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ONEIDA 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 100 AM CST for
north central and northeastern Wisconsin.

LAT...LON 4512 8905 4535 8898 4556 8897 4561 8860
      4564 8843 4537 8843 4485 8849 4464 8901
      4460 8910
TIME...MOT...LOC 0508Z 218DEG 40KT 4568 8887 4552 8888 4516 8891 4487
8910

$$

WIC041-067-078-083-115-135-160530-
/O.CON.KGRB.SV.W.0099.000000T0000Z-211216T0530Z/
Forest WI-Menominee WI-Waupaca WI-Oconto WI-Langlade WI-Shawano WI-
1108 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CST
FOR SOUTHERN FOREST...MENOMINEE...NORTH CENTRAL WAUPACA...NORTHERN
OCONTO...EASTERN LANGLADE AND WESTERN SHAWANO COUNTIES...

At 1108 PM CST, severe thunderstorms were located along a line
extending from 6 miles northwest of North Otter Creek Natural Area to
near Crandon to 6 miles west of White Lake to near Wittenberg, moving
northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
  Crandon, Neopit, Carter, Gardner Dam Scout Camp and McCaslin 
  Mountain Natural Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4512 8905 4535 8898 4556 8897 4561 8860
      4564 8843 4537 8843 4485 8849 4464 8901
      4460 8910
TIME...MOT...LOC 0508Z 218DEG 40KT 4568 8887 4552 8888 4516 8891 4487
8910

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kallas

911 
WWUS53 KGRB 160525
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1125 PM CST Wed Dec 15 2021

WIC041-067-078-083-115-135-160534-
/O.EXP.KGRB.SV.W.0099.000000T0000Z-211216T0530Z/
Forest WI-Menominee WI-Waupaca WI-Oconto WI-Langlade WI-Shawano WI-
1125 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN FOREST...MENOMINEE...
NORTH CENTRAL WAUPACA...NORTHERN OCONTO...EASTERN LANGLADE AND
WESTERN SHAWANO COUNTIES WILL EXPIRE AT 1130 PM CST...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
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.

LAT...LON 4512 8905 4535 8898 4556 8897 4561 8860
      4564 8843 4537 8843 4485 8849 4464 8901
      4460 8910
TIME...MOT...LOC 0524Z 236DEG 56KT 4581 8858 4565 8859 4529 8863 4501
8882

$$

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, 9:55 PM CST	Severe Thunderstorm Warning Considerable damage threat	GRB	Langlade, Lincoln, Marathon, Portage, Waushara, Wood	65 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.