Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 5, NWS Green Bay, WI

May 20, 2012Oneida County, Vilas County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at May 20, 2012, 1:32 PM CDT for Oneida County, Vilas County, Wisconsin. It was in force for 58 min. 1 report 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: May 20, 2012, 1:32 PM CDT (18:32 UTC)
Expired: May 20, 2012, 2:30 PM CDT
In force: 58 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Oneida County, WI, Vilas County, WI

The radar

The Marquette radar (KMQT), 184 km from the middle of the area, began a volume at 18:32 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
May 20, 1:48 PM CDT	HAIL 1.75	Lac Du Flambeau, 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
May 20, 12:24 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.5 hours before the alert went out and 221 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: 752 J/kg
Mixed-layer CIN: -121 J/kg
Mixed-layer LCL: 1614 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

117 
WUUS53 KGRB 201832
SVRGRB
WIC085-125-201930-
/O.NEW.KGRB.SV.W.0005.120520T1832Z-120520T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREEN BAY WI
132 PM CDT SUN MAY 20 2012

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN ONEIDA COUNTY IN NORTH CENTRAL WISCONSIN...
  WESTERN VILAS COUNTY IN NORTH CENTRAL WISCONSIN...

* UNTIL 230 PM CDT

* AT 130 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 9 MILES SOUTHWEST OF LAC DU FLAMBEAU...OR 25
  MILES EAST OF PARK FALLS...AND MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LAC DU FLAMBEAU...WINCHESTER...BOULDER JUNCTION...MINOCQUA...
  WOODRUFF...ARBOR VITAE...MANITOWISH WATERS AND PRESQUE ISLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. MOVE TO AN INTERIOR ROOM OF YOUR HOME OR
BUSINESS. HEAVY RAINS CAN FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE MOVING WATER COVERS THE ROAD.

&&

LAT...LON 4620 8941 4571 8981 4575 9005 4598 9005
      4599 9004 4599 8994 4630 8994 4630 8993
TIME...MOT...LOC 1832Z 209DEG 36KT 4585 8994
WIND...HAIL <50MPH 1.00IN

$$

TH

3 follow-up statements

394 
WWUS53 KGRB 201848
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
148 PM CDT SUN MAY 20 2012

WIC085-125-201930-
/O.CON.KGRB.SV.W.0005.000000T0000Z-120520T1930Z/
ONEIDA WI-VILAS WI-
148 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN VILAS
AND EXTREME NORTH CENTRAL ONEIDA COUNTIES UNTIL 230 PM CDT...

AT 147 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED NEAR LAC DU FLAMBEAU...OR 29 MILES WEST OF EAGLE
RIVER...MOVING NORTHEAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  WINCHESTER...BOULDER JUNCTION...MANITOWISH WATERS AND PRESQUE ISLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. MOVE TO AN INTERIOR ROOM OF YOUR HOME OR
BUSINESS. HEAVY RAINS CAN FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE MOVING WATER COVERS THE ROAD.

&&

LAT...LON 4620 8941 4585 8970 4592 8996 4598 9005
      4599 9000 4599 8994 4630 8994 4630 8993
TIME...MOT...LOC 1848Z 209DEG 36KT 4599 8983
WIND...HAIL <50MPH 1.00IN

$$

TH

894 
WWUS53 KGRB 201858
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
158 PM CDT SUN MAY 20 2012

WIC085-125-201930-
/O.CON.KGRB.SV.W.0005.000000T0000Z-120520T1930Z/
ONEIDA WI-VILAS WI-
158 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WESTERN VILAS
AND EXTREME NORTH CENTRAL ONEIDA COUNTIES UNTIL 230 PM CDT...

AT 156 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED 8 MILES SOUTHWEST OF BOULDER JUNCTION...OR 27 MILES
WEST OF EAGLE RIVER...MOVING NORTHEAST AT 40 MPH.

IN ADDITION...AT 148 PM CDT GOLF BALL SIZE HAIL WAS REPORTED IN LAC 
DU FLAMBEAU WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  WINCHESTER...BOULDER JUNCTION...MANITOWISH WATERS AND PRESQUE ISLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. MOVE TO AN INTERIOR ROOM OF YOUR HOME OR
BUSINESS. HEAVY RAINS CAN FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE MOVING WATER COVERS THE ROAD.

&&

LAT...LON 4620 8941 4585 8970 4592 8996 4598 9005
      4599 9000 4599 8994 4630 8994 4630 8993
TIME...MOT...LOC 1857Z 209DEG 36KT 4607 8977
WIND...HAIL <50MPH 1.00IN

$$

TH

814 
WWUS53 KGRB 201921
SVSGRB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
221 PM CDT SUN MAY 20 2012

WIC085-125-201931-
/O.EXP.KGRB.SV.W.0005.000000T0000Z-120520T1930Z/
ONEIDA WI-VILAS WI-
221 PM CDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN VILAS AND EXTREME
NORTH CENTRAL ONEIDA COUNTIES WILL EXPIRE AT 230 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  HOWEVER HAIL IS STILL POSSIBLE WITH THIS THUNDERSTORM OVER 
EASTERN VILAS COUNTY.

LAT...LON 4620 8941 4585 8970 4592 8996 4598 9005
      4599 9000 4599 8994 4630 8994 4630 8993
TIME...MOT...LOC 1921Z 209DEG 36KT 4628 8960

$$

KALLAS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 1:55 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Marathon	50 min
May 20, 2:40 PM CDT	Severe Thunderstorm Warning	GRB	Oneida, Vilas	65 min
May 20, 2:53 PM CDT	Severe Thunderstorm Warning	GRB	Langlade	67 min
May 20, 3:22 PM CDT	Severe Thunderstorm Warning	GRB	Forest	53 min
May 20, 3:56 PM CDT	Severe Thunderstorm Warning	GRB	Langlade, Menominee, Oconto	49 min
May 20, 3:58 PM CDT	Severe Thunderstorm Warning	GRB	Florence	32 min
May 20, 4:10 PM CDT	Small Craft Advisory	GRB		5 hr
May 20, 4:21 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Langlade, Marinette, Oconto	39 min
May 20, 4:56 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	17 min
May 20, 5:38 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	50 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012 Every severe thunderstorm warning in 2012

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.