Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 7, NWS Milwaukee, WI

May 3, 2012Jefferson County, Wisconsin

NWS Milwaukee, WI issued this severe thunderstorm warning at May 3, 2012, 1:29 PM CDT for Jefferson County, Wisconsin. It was in force for 46 min. 8 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
May 3, 2012, 1:29 PM CDT (18:29 UTC)
Expired
May 3, 2012, 2:15 PM CDT
In force
46 min
Issued by
NWS Milwaukee, WI
Area
Storm-based polygon
Hail
1.25 in
Wind
50.0 mph

County Jefferson County, WI

The radar

The Milwaukee radar (KMKX), 22 km from the middle of the area, began a volume at 18:31 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 3, 1:39 PM CDTHAIL 0.52 W Lake Mills, WIOBSERVED AT KORTH PARK ON THE WEST SIDE OF ROCK LAKE
May 3, 1:40 PM CDTHAIL 1.253.7 Se Lake Mills, WI
May 3, 1:41 PM CDTHAIL 1Lake Mills, WI
May 3, 1:48 PM CDTHAIL 1Johnson Creek, WIESTIMATED 50 MPH WIND GUST
May 3, 1:49 PM CDTHAIL 0.25Johnson Creek, WIESTIMATED 50 MPH WINDS
May 3, 1:55 PM CDTHAIL 0.885 E Johnson Creek, WIDELAYED REPORT. NEAR INTERSECTION OF COUNTY HIGHWAYS B AND D.
May 3, 2:02 PM CDTHAIL 15 N Sullivan, WIIN CONCORD.
May 3, 2:23 PM CDTHAIL 1.251 Se Lake Mills, 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.

IssuedProductOfficeLasted
May 3, 1:07 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.5 hours before the alert went out and 166 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 2012-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 321 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 2012-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 160 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
321 J/kg
Mixed-layer CIN
-146 J/kg
Mixed-layer LCL
565 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
160 m²/s²
0-3 km storm-relative helicity
220 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

202 
WUUS53 KMKX 031829
SVRMKX
WIC055-031915-
/O.NEW.KMKX.SV.W.0007.120503T1829Z-120503T1915Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
129 PM CDT THU MAY 3 2012

THE NATIONAL WEATHER SERVICE IN SULLIVAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN JEFFERSON COUNTY IN SOUTHEAST WISCONSIN...

* UNTIL 215 PM CDT

* AT 127 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING HALF DOLLAR SIZE HAIL. 
  THIS STORM WAS LOCATED NEAR CAMBRIDGE...OR 7 MILES SOUTHWEST OF
  LAKE MILLS...AND MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  LAKE MILLS...JEFFERSON...JOHNSON CREEK...WATERTOWN AIRPORT...
  MILFORD...HELENVILLE...PIPERSVILLE AND SULLIVAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4297 8894 4310 8899 4320 8866 4320 8862
      4301 8855
TIME...MOT...LOC 1829Z 256DEG 27KT 4302 8900
WIND...HAIL <50MPH 1.25IN

$$

WIMBERLEY
2 follow-up statements
611 
WWUS53 KMKX 031854
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
154 PM CDT THU MAY 3 2012

WIC055-031915-
/O.CON.KMKX.SV.W.0007.000000T0000Z-120503T1915Z/
JEFFERSON WI-
154 PM CDT THU MAY 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
JEFFERSON COUNTY UNTIL 215 PM CDT...

AT 148 PM CDT...A NATIONAL WEATHER SERVICE EMPLOYEE REPORTED A 
SEVERE THUNDERSTORM PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS 
LOCATED OVER JOHNSON CREEK...OR NEAR JEFFERSON...MOVING EAST AT 30 
MPH.

LOCATIONS IMPACTED INCLUDE...
  WATERTOWN AIRPORT...HELENVILLE...PIPERSVILLE AND SULLIVAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS!

&&

LAT...LON 4299 8878 4315 8884 4320 8866 4320 8862
      4301 8855
TIME...MOT...LOC 1853Z 256DEG 27KT 4306 8876
WIND...HAIL <50MPH 1.00IN

$$

WIMBERLEY
864 
WWUS53 KMKX 031911
SVSMKX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
211 PM CDT THU MAY 3 2012

WIC055-031915-
/O.CON.KMKX.SV.W.0007.000000T0000Z-120503T1915Z/
JEFFERSON WI-
211 PM CDT THU MAY 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JEFFERSON COUNTY 
WILL EXPIRE AT 215 PM CDT...

THE STORM WHICH PROMPTED THE WARNING WILL MOVE OUT OF THE WARNED 
AREA.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN SULLIVAN.

LAT...LON 4299 8878 4305 8880 4320 8866 4320 8862
      4301 8855
TIME...MOT...LOC 1911Z 256DEG 27KT 4309 8858
WIND...HAIL <50MPH <.75IN

$$

BROOKS

The office that day

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

IssuedProductOfficeCountiesLasted
May 3, 2:09 AM CDTAreal Flood AdvisoryMKXFond du Lac, Green Lake, Marquette3 hr
May 3, 8:34 AM CDTAreal Flood AdvisoryMKXGreen Lake, Marquette3 hr
May 3, 11:41 AM CDTSmall Craft AdvisoryMKX4 hr
May 3, 12:54 PM CDTSevere Thunderstorm WarningMKXDane, Jefferson51 min
May 3, 1:05 PM CDTSevere Thunderstorm WarningMKXDodge, Jefferson40 min
May 3, 1:31 PM CDTSpecial Marine WarningMKX29 min
May 3, 1:41 PM CDTSevere Thunderstorm WarningMKXDodge, Washington49 min
May 3, 1:53 PM CDTSpecial Marine WarningMKX37 min
May 3, 2:15 PM CDTSevere Thunderstorm WarningMKXMilwaukee, Ozaukee, Washington, Waukesha30 min
May 3, 2:23 PM CDTSpecial Marine WarningMKX12 min
May 3, 2:29 PM CDTSpecial Marine WarningMKX31 min
May 3, 2:54 PM CDTSpecial Marine WarningMKX66 min
May 3, 2:59 PM CDTSevere Thunderstorm WarningMKXColumbia, Dodge46 min
May 3, 3:21 PM CDTSevere Thunderstorm WarningMKXDane39 min
May 3, 3:52 PM CDTSevere Thunderstorm WarningMKXDodge23 min
May 3, 3:52 PM CDTSevere Thunderstorm WarningMKXDane, Jefferson23 min
May 3, 4:10 PM CDTSevere Thunderstorm WarningMKXJefferson, Waukesha35 min
May 3, 4:17 PM CDTSpecial Marine WarningMKX43 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.