Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 256, NWS Twin Cities, MN

August 3, 2012Chisago County, Washington County, Minnesota; 4 counties in Wisconsin

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 2012, 11:38 PM CDT for Chisago County, Washington County, Minnesota; 4 counties in Wisconsin. It was in force for 67 min. 10 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
Aug 3, 2012, 11:38 PM CDT (04:38 UTC)
Expired
Aug 4, 2012, 12:45 AM CDT
In force
67 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Chisago County, MN, Washington County, MN, Barron County, WI, Dunn County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 119 km from the middle of the area, began a volume at 04:39 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
Aug 3, 11:40 PM CDTTSTM WND DMG3 S Lindstrom, MNSEVERAL EIGHT INCH BRANCHES DOWN.
Aug 3, 11:45 PM CDTTSTM WND DMGBayport, MNFEW TREES DOWN...INCLUDING ON POWER LINES.
Aug 3, 11:50 PM CDTTSTM WND DMGOsceola, WITREE DOWN ACROSS HIGHWAY 35.
Aug 3, 11:55 PM CDTTSTM WND DMG1 S Somerset, WITREE DOWN ACROSS ROAD.
Aug 3, 11:55 PM CDTTSTM WND DMGCenturia, WITREE DOWN ACROSS ROAD JUST NORTH OF 160TH AVENUE.
Aug 3, 11:55 PM CDTTSTM WND DMGHudson, WISEVERAL TREES DOWN...INCLUDING SOME BLOCKING ROADS.
Aug 4, 12:05 AM CDTTSTM WND DMG3 Wsw Wanderoos, WILARGE TREE DOWN ACROSS ROAD.
Aug 4, 12:05 AM CDTTSTM WND DMG4 Ne Star Prairie, WITREE DOWN ACROSS ROAD.
Aug 4, 12:10 AM CDTTSTM WND DMGRoberts, WIFEW TREES DOWN.
Aug 4, 12:25 AM CDTTSTM WND DMG5 Wnw Turtle Lake, WITREE DOWN ACROSS ROAD.

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
Aug 3, 7:33 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 3, 10:57 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.6 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, Minneapolis, MN at 00:00Z on 2012-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 576 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, Minneapolis, MN at 00:00Z on 2012-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 100 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
576 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
1840 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
100 m²/s²
0-3 km storm-relative helicity
257 m²/s²
Significant tornado parameter
0.1
Supercell composite
7.5

Open this sounding in Storm Lab

The text

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

409 
WUUS53 KMPX 040438
SVRMPX
MNC025-163-WIC005-033-095-109-040545-
/O.NEW.KMPX.SV.W.0256.120804T0438Z-120804T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1138 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN CHISAGO COUNTY IN EAST CENTRAL MINNESOTA...
  WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...
  BARRON COUNTY IN NORTHWEST WISCONSIN...
  NORTHERN DUNN COUNTY IN WEST CENTRAL WISCONSIN...
  POLK COUNTY IN NORTHWEST WISCONSIN...
  ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 1245 AM CDT

* AT 1135 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 6 MILES EAST OF RUSH CITY TO
  OSCEOLA TO WOODBURY...AND MOVING EAST AT 50 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CONNORSVILLE23...
  NEW RICHMOND...
  BALSAM LAKE...
  AMERY...
  MENOMONIE...
  RICE LAKE...
  SHAFER...
  MARINE ON ST CROIX...
  STILLWATER...
  SCANDIA...
  CENTER CITY...
  WOODBURY...
  LINDSTROM...
  LAKE ELMO...

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.

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

&&

LAT...LON 4565 9214 4564 9179 4548 9169 4526 9168
      4484 9173 4487 9297 4532 9293 4574 9301
      4573 9286 4565 9287 4565 9254 4574 9252
      4574 9216
TIME...MOT...LOC 0438Z 272DEG 43KT 4567 9279 4531 9273
          4490 9283
WIND...HAIL 60MPH <.75IN

$$
SPD
3 follow-up statements
335 
WWUS53 KMPX 040512
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1212 AM CDT SAT AUG 4 2012

MNC025-163-040527-
/O.CAN.KMPX.SV.W.0256.000000T0000Z-120804T0545Z/
CHISAGO MN-WASHINGTON MN-
1212 AM CDT SAT AUG 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR WASHINGTON AND EASTERN CHISAGO
COUNTIES IS CANCELLED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE MOVED OUT OF THE 
WARNED AREA.

LAT...LON 4565 9214 4564 9179 4548 9169 4525 9168
      4484 9173 4487 9276 4496 9276 4533 9266
      4560 9263 4565 9254 4574 9252 4574 9216
TIME...MOT...LOC 0512Z 272DEG 43KT 4565 9221 4529 9215
          4488 9226

$$

WIC005-033-095-109-040545-
/O.CON.KMPX.SV.W.0256.000000T0000Z-120804T0545Z/
BARRON WI-DUNN WI-ST. CROIX WI-POLK WI-
1212 AM CDT SAT AUG 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR POLK...ST.
CROIX...NORTHERN DUNN AND BARRON COUNTIES UNTIL 1245 AM CDT...

AT 1207 AM 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 CLAM FALLS TO
CLEAR LAKE TO MARTEL...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  CONNORSVILLE23...MENOMONIE...RICE LAKE...MCKINLEY...TURTLE LAKE...
  HERSEY...GLENWOOD CITY...WILSON...COMSTOCK...KNAPP...CUMBERLAND...
  BOYCEVILLE...PRAIRIE FARM...BARRONETT AND RIDGELAND.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4565 9214 4564 9179 4548 9169 4525 9168
      4484 9173 4487 9276 4496 9276 4533 9266
      4560 9263 4565 9254 4574 9252 4574 9216
TIME...MOT...LOC 0512Z 272DEG 43KT 4565 9221 4529 9215
          4488 9226
WIND...HAIL 60MPH <.75IN

$$
SPD
664 
WWUS53 KMPX 040532
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1232 AM CDT SAT AUG 4 2012

WIC005-033-095-109-040545-
/O.CON.KMPX.SV.W.0256.000000T0000Z-120804T0545Z/
BARRON WI-DUNN WI-ST. CROIX WI-POLK WI-
1232 AM CDT SAT AUG 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
POLK...EASTERN ST. CROIX...NORTHERN DUNN AND BARRON COUNTIES UNTIL
1245 AM CDT...

AT 1230 AM 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 BARRONETT TO
HILLSDALE TO MENOMONIE...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  MENOMONIE...RICE LAKE...TAINTER LAKE...HAUGEN...CAMERON AND COLFAX.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4572 9215 4565 9214 4564 9179 4548 9169
      4525 9168 4484 9173 4487 9256 4529 9239
      4574 9226
TIME...MOT...LOC 0532Z 272DEG 43KT 4563 9186 4527 9181
          4486 9193
WIND...HAIL 60MPH <.75IN

$$
SPD
249 
WWUS53 KMPX 040545
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1245 AM CDT SAT AUG 4 2012

WIC005-033-095-109-040559-
/O.EXP.KMPX.SV.W.0256.000000T0000Z-120804T0545Z/
BARRON WI-DUNN WI-ST. CROIX WI-POLK WI-
1245 AM CDT SAT AUG 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN POLK...EASTERN ST.
CROIX...NORTHERN DUNN AND BARRON COUNTIES WILL EXPIRE AT 1245 AM
CDT...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS.

IN ADDITION...STRONG THUNDERSTORMS MAY REDEVELOP...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 4 AM.

LAT...LON 4572 9215 4565 9214 4564 9179 4548 9169
      4525 9168 4484 9173 4487 9256 4529 9239
      4574 9226
TIME...MOT...LOC 0544Z 272DEG 43KT 4561 9165 4525 9161
          4485 9174

$$
SPD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 7:14 PM CDTSpecial Weather StatementMPXChippewa, Lac qui Parle, Swift, Yellow Medicine46 min
Aug 3, 7:37 PM CDTSevere Thunderstorm WarningMPXLac qui Parle, Yellow Medicine53 min
Aug 3, 8:20 PM CDTSevere Thunderstorm WarningMPXChippewa, Lac qui Parle, Renville, Swift, Yellow Medicine55 min
Aug 3, 8:26 PM CDTSevere Thunderstorm WarningMPXDouglas, Pope, Stevens49 min
Aug 3, 9:01 PM CDTSevere Thunderstorm WarningMPXBrown, Redwood, Renville, Yellow Medicine59 min
Aug 3, 9:07 PM CDTSevere Thunderstorm WarningMPXChippewa, Kandiyohi, Meeker, Pope, Renville, Stearns and 2 more53 min
Aug 3, 9:47 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Brown, McLeod, Nicollet, Redwood, Renville and 1 more58 min
Aug 3, 9:52 PM CDTSevere Thunderstorm WarningMPXMcLeod, Meeker, Renville, Sherburne, Stearns, Wright38 min
Aug 3, 10:25 PM CDTSpecial Weather StatementMPXAnoka, Carver, Hennepin, McLeod, Sherburne, Wright65 min
Aug 3, 10:29 PM CDTSpecial Weather StatementMPXLe Sueur, Nicollet, Rice, Scott61 min
Aug 3, 10:39 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin36 min
Aug 3, 10:44 PM CDTSevere Thunderstorm WarningMPXAnoka, Benton, Isanti, Mille Lacs, Sherburne, Wright46 min
Aug 3, 10:54 PM CDTSevere Thunderstorm WarningMPXAnoka, Carver, Hennepin, Sherburne, Wright25 min
Aug 3, 11:01 PM CDTSpecial Weather StatementMPXBlue Earth, Faribault, Freeborn, Martin, Steele, Waseca44 min
Aug 3, 11:06 PM CDTSevere Thunderstorm WarningMPXAnoka, Carver, Chisago, Dakota, Hennepin, Ramsey and 2 more39 min
Aug 3, 11:12 PM CDTSevere Thunderstorm WarningMPXAnoka, Chisago, Isanti33 min
Aug 3, 11:18 PM CDTSevere Thunderstorm WarningMPXDakota, Goodhue, Rice, Scott, Washington42 min
Aug 3, 11:44 PM CDTSevere Thunderstorm WarningMPXDakota, Goodhue, Washington61 min
Aug 4, 12:19 AM CDTSpecial Weather StatementMPXBrown26 min
Aug 4, 1:13 AM CDTSpecial Weather StatementMPXMartin47 min
Aug 4, 1:25 AM CDTSevere Thunderstorm WarningMPXFaribault, Martin65 min
Aug 4, 4:28 AM CDTSpecial Weather StatementMPXFaribault47 min
Aug 4, 12:43 AM CDTSpecial Weather StatementMPXBarron, Chippewa, Dunn, Eau Claire, Pepin, Rusk62 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2012Severe Thunderstorm Warnings in Minnesota, 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.