Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 15, NWS Milwaukee, WI

May 6, 2012Marquette County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at May 6, 2012, 7:52 AM CDT for Marquette County, Wisconsin. It was in force for 24 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 6, 2012, 7:52 AM CDT (12:52 UTC)
Expired
May 6, 2012, 8:16 AM CDT
In force
24 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.5 in
Wind
50.0 mph

County Marquette County, WI

The radar

The Milwaukee radar (KMKX), 123 km from the middle of the area, began a volume at 12:55 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

TimeReportWhereRemark
May 6, 7:55 AM CDTHAIL 0.5Oxford, WI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 0.9 hours before the alert went out and 129 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 2012-05-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2012-05-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
691 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
113 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.

836 
WUUS53 KMKX 061252
SVRMKX
WIC077-061330-
/O.NEW.KMKX.SV.W.0015.120506T1252Z-120506T1330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
752 AM CDT SUN MAY 6 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN MARQUETTE COUNTY IN SOUTH CENTRAL WISCONSIN...

* UNTIL 830 AM CDT

* AT 745 AM CDT...TRAINED WEATHER SPOTTERS REPORTED A SEVERE
  THUNDERSTORM PRODUCING PING PONG BALL SIZE HAIL.  THIS STORM WAS
  LOCATED 8 MILES SOUTHWEST OF WESTFIELD...OR 15 MILES SOUTHEAST OF
  FRIENDSHIP...AND MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WESTFIELD...LAWRENCE...HARRISVILLE AND SPRINGFIELD CORNERS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4398 8921 4377 8951 4370 8960 4371 8961
      4398 8960
TIME...MOT...LOC 1252Z 223DEG 26KT 4383 8959
WIND...HAIL <50MPH 1.50IN

$$

WIMBERLEY
1 follow-up statement
742 
WWUS53 KMKX 061316
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
816 AM CDT SUN MAY 6 2012

WIC077-061326-
/O.CAN.KMKX.SV.W.0015.000000T0000Z-120506T1330Z/
MARQUETTE WI-
816 AM CDT SUN MAY 6 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MARQUETTE 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.
HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 4398 8921 4377 8951 4370 8960 4371 8961
      4398 8960
TIME...MOT...LOC 1316Z 223DEG 26KT 4395 8942

$$

WIMBERLEY

The office that day

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

IssuedProductOfficeCountiesLasted
May 6, 8:29 AM CDTSevere Thunderstorm WarningMKXColumbia, Green Lake, Marquette31 min
May 6, 9:10 AM CDTSevere Thunderstorm WarningMKXColumbia, Dodge, Fond du Lac, Green Lake30 min
May 6, 9:32 AM CDTSevere Thunderstorm WarningMKXDane, Jefferson, Rock28 min
May 6, 9:54 AM CDTSevere Thunderstorm WarningMKXJefferson, Rock, Walworth36 min
May 6, 10:12 AM CDTSevere Thunderstorm WarningMKXJefferson33 min
May 6, 12:22 PM CDTSevere Thunderstorm WarningMKXKenosha, Milwaukee, Racine, Walworth, Waukesha23 min
May 6, 12:27 PM CDTSpecial Marine WarningMKX40 min
May 6, 6:00 PM CDTSevere Thunderstorm WarningMKXWalworth30 min
May 6, 6:46 PM CDTSevere Thunderstorm WarningMKXRacine, Walworth29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.