Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 6, NWS Green Bay, WI

May 20, 2012Lincoln County, Marathon County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at May 20, 2012, 1:55 PM CDT for Lincoln County, Marathon County, Wisconsin. It was in force for 50 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, 1:55 PM CDT (18:55 UTC)
Expired: May 20, 2012, 2:45 PM CDT
In force: 50 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Lincoln County, WI, Marathon County, WI

The radar

The La Crosse radar (KARX), 167 km from the middle of the area, began a volume at 18:58 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, 2:35 PM CDT	HAIL 0.88	Spirit Falls, 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, 6.9 hours before the alert went out and 177 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.

431 
WUUS53 KGRB 201855
SVRGRB
WIC069-073-202000-
/O.NEW.KGRB.SV.W.0006.120520T1855Z-120520T2000Z/

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

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN LINCOLN COUNTY IN NORTH CENTRAL WISCONSIN...
  NORTHWESTERN MARATHON COUNTY IN CENTRAL WISCONSIN...

* UNTIL 300 PM CDT

* AT 151 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR DORCHESTER...OR 8 MILES SOUTHEAST OF
  MEDFORD...AND MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  TRIPOLI...TOMAHAWK...SPIRIT FALLS...BRADLEY AND HEAFFORD JUNCTION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT
IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND MOVE
TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT
OR SMALL INTERIOR ROOM.

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...AND DEADLY
LIGHTNING. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS.

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 4503 9032 4504 9020 4513 9019 4513 9005
      4555 9005 4555 8961 4485 9031 4488 9033
TIME...MOT...LOC 1855Z 207DEG 37KT 4508 9023
WIND...HAIL <50MPH 1.00IN

$$

TH

3 follow-up statements

053 
WWUS53 KGRB 201911
SVSGRB

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

WIC069-073-202000-
/O.CON.KGRB.SV.W.0006.000000T0000Z-120520T2000Z/
LINCOLN WI-MARATHON WI-
211 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
MARATHON AND NORTHWESTERN LINCOLN COUNTIES UNTIL 300 PM CDT...

AT 209 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED 8 MILES SOUTHEAST OF RIB LAKE...OR 11 MILES
NORTHEAST OF MEDFORD...MOVING NORTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  TOMAHAWK...SPIRIT FALLS...BRADLEY AND HEAFFORD JUNCTION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...AND DEADLY
LIGHTNING. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS.

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 4512 9019 4512 9007 4515 9005 4555 9005
      4555 8961 4514 9006 4507 9011 4505 9015
      4504 9020
TIME...MOT...LOC 1911Z 207DEG 37KT 4523 9012
WIND...HAIL <50MPH 1.00IN

$$

TH

120 
WWUS53 KGRB 201931
SVSGRB

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

WIC073-201940-
/O.CAN.KGRB.SV.W.0006.000000T0000Z-120520T2000Z/
MARATHON WI-
231 PM CDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MARATHON COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.  A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT.

LAT...LON 4555 9005 4555 8961 4516 9005
TIME...MOT...LOC 1930Z 207DEG 37KT 4537 8989

$$

WIC069-202000-
/O.CON.KGRB.SV.W.0006.000000T0000Z-120520T2000Z/
LINCOLN WI-
231 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
LINCOLN COUNTY UNTIL 300 PM CDT...

AT 226 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
STORM WAS LOCATED 13 MILES SOUTHWEST OF TOMAHAWK...OR 25 MILES
NORTHEAST OF MEDFORD...MOVING NORTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  TOMAHAWK...SPIRIT FALLS...BRADLEY AND HEAFFORD JUNCTION.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...AND DEADLY
LIGHTNING. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS.

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 4555 9005 4555 8961 4516 9005
TIME...MOT...LOC 1930Z 207DEG 37KT 4537 8989
WIND...HAIL <50MPH 1.00IN

$$

TH

178 
WWUS53 KGRB 201945
SVSGRB

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

WIC069-201955-
/O.CAN.KGRB.SV.W.0006.000000T0000Z-120520T2000Z/
LINCOLN WI-
245 PM CDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LINCOLN COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT.

LAT...LON 4555 9005 4555 8961 4516 9005
TIME...MOT...LOC 1945Z 207DEG 37KT 4551 8979

$$

TH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 1:32 PM CDT	Severe Thunderstorm Warning	GRB	Oneida, Vilas	58 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.