Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS Green Bay, WI

May 20, 2012Marinette County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at May 20, 2012, 4:56 PM CDT for Marinette County, Wisconsin. It was in force for 17 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
May 20, 2012, 4:56 PM CDT (21:56 UTC)
Expired
May 20, 2012, 5:13 PM CDT
In force
17 min
Issued by
NWS Green Bay, WI
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Marinette County, WI

The radar

The Marquette radar (KMQT), 111 km from the middle of the area, began a volume at 21:56 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 20, 12:24 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.9 hours before the alert went out and 121 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-pSkew-T log-p diagram, Green Bay/Straub, WI at 12:00Z on 2012-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 752 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Green Bay/Straub, WI at 12:00Z on 2012-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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.

421 
WUUS53 KGRB 202156
SVRGRB
WIC075-202230-
/O.NEW.KGRB.SV.W.0013.120520T2156Z-120520T2230Z/

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

THE NATIONAL WEATHER SERVICE IN GREEN BAY HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MARINETTE COUNTY IN NORTHEAST WISCONSIN...

* UNTIL 530 PM CDT

* AT 455 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 5 MILES
  NORTH OF WAUSAUKEE...OR 26 MILES NORTHWEST OF MENOMINEE...AND
  MOVING NORTH AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PEMBINE...AMBERG...BEECHER AND NIAGARA.

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 4576 8796 4575 8787 4568 8777 4566 8782
      4560 8777 4556 8779 4556 8783 4550 8779
      4544 8785 4540 8785 4537 8787 4535 8785
      4535 8779 4521 8787 4526 8813 4578 8806
      4580 8802 4580 8799
TIME...MOT...LOC 2156Z 197DEG 44KT 4545 8791
WIND...HAIL 60MPH 1.00IN

$$

TH
2 follow-up statements
060 
WWUS53 KGRB 202203
SVSGRB

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

WIC075-202230-
/O.CON.KGRB.SV.W.0013.000000T0000Z-120520T2230Z/
MARINETTE WI-
503 PM CDT SUN MAY 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTH CENTRAL
MARINETTE COUNTY UNTIL 530 PM CDT...

AT 459 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES
NORTH OF WAUSAUKEE...OR 24 MILES SOUTHEAST OF KINGSFORD...MOVING
NORTH AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  PEMBINE...BEECHER AND NIAGARA.

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 4576 8796 4575 8787 4568 8777 4566 8782
      4560 8777 4556 8779 4556 8783 4550 8779
      4544 8785 4540 8785 4537 8788 4542 8809
      4578 8806 4580 8803 4580 8799
TIME...MOT...LOC 2203Z 197DEG 44KT 4553 8787
WIND...HAIL 60MPH 1.00IN

$$

TH
034 
WWUS53 KGRB 202213
SVSGRB

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

WIC075-202223-
/O.CAN.KGRB.SV.W.0013.000000T0000Z-120520T2230Z/
MARINETTE WI-
513 PM CDT SUN MAY 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MARINETTE COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT. 

LAT...LON 4576 8796 4575 8787 4568 8777 4566 8782
      4560 8777 4556 8779 4556 8783 4550 8779
      4544 8785 4540 8785 4537 8788 4542 8809
      4578 8806 4580 8803 4580 8799
TIME...MOT...LOC 2213Z 197DEG 44KT 4565 8782

$$

TH

The office that day

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

IssuedProductOfficeCountiesLasted
May 20, 1:32 PM CDTSevere Thunderstorm WarningGRBOneida, Vilas58 min
May 20, 1:55 PM CDTSevere Thunderstorm WarningGRBLincoln, Marathon50 min
May 20, 2:40 PM CDTSevere Thunderstorm WarningGRBOneida, Vilas65 min
May 20, 2:53 PM CDTSevere Thunderstorm WarningGRBLanglade67 min
May 20, 3:22 PM CDTSevere Thunderstorm WarningGRBForest53 min
May 20, 3:56 PM CDTSevere Thunderstorm WarningGRBLanglade, Menominee, Oconto49 min
May 20, 3:58 PM CDTSevere Thunderstorm WarningGRBFlorence32 min
May 20, 4:10 PM CDTSmall Craft AdvisoryGRB5 hr
May 20, 4:21 PM CDTSevere Thunderstorm WarningGRBForest, Langlade, Marinette, Oconto39 min
May 20, 5:38 PM CDTSevere Thunderstorm WarningGRBMarinette50 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.