Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 198, NWS Twin Cities, MN

June 20, 20124 counties in Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Jun 20, 2012, 4:08 PM CDT for 4 counties in Wisconsin. It was in force for 52 min. 2 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
Jun 20, 2012, 4:08 PM CDT (21:08 UTC)
Expired
Jun 20, 2012, 5:00 PM CDT
In force
52 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Dunn County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 115 km from the middle of the area, began a volume at 21:07 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
Jun 20, 4:38 PM CDTTSTM WND DMG2 N Menomonie, WIA LARGE TREE WAS BLOCKING COUNTY ROAD BB AND 500TH STREET, NORTH OF MENOMONIE.
Jun 20, 4:40 PM CDTTSTM WND DMGMenomonie, WIEIGHT INCH DIAMETER TREES SNAPPED. OCCURRED ON 19TH AVE.

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 9.1 hours before the alert went out and 117 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, Minneapolis, MN at 12:00Z on 2012-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 737 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2012-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 272 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
737 J/kg
Mixed-layer CIN
-116 J/kg
Mixed-layer LCL
974 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
272 m²/s²
0-3 km storm-relative helicity
358 m²/s²
Significant tornado parameter
0.7
Supercell composite
15.1

Open this sounding in Storm Lab

The text

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

771 
WUUS53 KMPX 202108
SVRMPX
WIC033-091-093-109-202200-
/O.NEW.KMPX.SV.W.0198.120620T2108Z-120620T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
408 PM CDT WED JUN 20 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DUNN COUNTY IN WEST CENTRAL WISCONSIN...
  PEPIN COUNTY IN WEST CENTRAL WISCONSIN...
  PIERCE COUNTY IN WEST CENTRAL WISCONSIN...
  EASTERN ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 500 PM CDT

* AT 407 PM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH. THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM BOYCEVILLE TO 8 MILES EAST OF
  ELLSWORTH TO FRONTENAC...AND MOVING EAST AT 40 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CONNORSVILLE23...
  ELLSWORTH...
  MENOMONIE...
  DURAND...
  SPRING VALLEY...
  WILSON...
  HERSEY...
  BAY CITY...
  ESDAILE...
  GLENWOOD CITY...
  WOODVILLE...
  MARTEL...
  HAGER CITY...
  EMERALD...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR
DAMAGING WINDS IN EXCESS OF 60 MPH. SEEK SHELTER NOW INSIDE A STURDY
STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4464 9174 4459 9182 4459 9201 4445 9205
      4442 9211 4449 9230 4452 9230 4456 9233
      4456 9249 4458 9255 4480 9251 4520 9226
      4519 9170
TIME...MOT...LOC 2108Z 283DEG 33KT 4501 9208 4473 9231
          4453 9240
WIND...HAIL 60MPH <.75IN

$$
2 follow-up statements
389 
WWUS53 KMPX 202137
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
437 PM CDT WED JUN 20 2012

WIC033-091-093-109-202200-
/O.CON.KMPX.SV.W.0198.000000T0000Z-120620T2200Z/
DUNN WI-PEPIN WI-ST. CROIX WI-PIERCE WI-
437 PM CDT WED JUN 20 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
PIERCE...SOUTHEASTERN ST. CROIX...PEPIN AND DUNN COUNTIES UNTIL 500
PM CDT...

AT 435 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A LINE OF
SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH. 
THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM COLFAX TO EAU
GALLE TO STOCKHOLM...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  DURAND...ARKANSAW...PORCUPINE...PEPIN AND ELLA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...LARGE HAIL...AND DEADLY LIGHTNING. FOR YOUR PROTECTION MOVE TO
AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4464 9174 4459 9182 4459 9201 4445 9205
      4442 9211 4449 9230 4456 9233 4457 9248
      4456 9249 4458 9255 4490 9226 4518 9207
      4519 9170
TIME...MOT...LOC 2137Z 283DEG 33KT 4495 9171 4467 9202
          4452 9216
WIND...HAIL 60MPH <.75IN

$$
995 
WWUS53 KMPX 202153
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
453 PM CDT WED JUN 20 2012

WIC033-091-093-109-202208-
/O.EXP.KMPX.SV.W.0198.000000T0000Z-120620T2200Z/
DUNN WI-PEPIN WI-ST. CROIX WI-PIERCE WI-
453 PM CDT WED JUN 20 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PIERCE...SOUTHEASTERN
ST. CROIX...PEPIN AND DUNN COUNTIES WILL EXPIRE AT 500 PM CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW 
SEVERE LIMITS.  HOWEVER GUSTY WINDS AND TORRENTIAL RAIN ARE STILL 
POSSIBLE WITH THESE THUNDERSTORMS.

LAT...LON 4464 9174 4459 9182 4459 9201 4445 9205
      4442 9211 4449 9230 4456 9233 4457 9248
      4456 9249 4458 9255 4490 9226 4518 9207
      4519 9170
TIME...MOT...LOC 2153Z 283DEG 33KT 4491 9151 4463 9182
          4449 9196

$$
DWE

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 20, 3:55 PM CDTAreal Flood AdvisoryMPXBarron, Dunn, Pepin, Pierce, Polk, Rusk and 1 more4 hr
Jun 20, 4:34 PM CDTAreal Flood AdvisoryMPXChippewa, Eau Claire, Rusk3 hr
Jun 20, 4:46 PM CDTSevere Thunderstorm WarningMPXChippewa, Dunn, Eau Claire44 min
Jun 20, 5:03 PM CDTSpecial Weather StatementMPXRusk42 min
Jun 20, 5:11 PM CDTSevere Thunderstorm WarningMPXChippewa, Rusk34 min
Jun 20, 5:31 PM CDTSevere Thunderstorm WarningMPXChippewa, Eau Claire44 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.