Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 257, NWS Twin Cities, MN

August 3, 2012Dunn County, Pepin County, Pierce County, Wisconsin; Dakota County, Goodhue County, Washington County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 2012, 11:44 PM CDT for Dunn County, Pepin County, Pierce County, Wisconsin; Dakota County, Goodhue County, Washington County, Minnesota. It was in force for 61 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
Aug 3, 2012, 11:44 PM CDT (04:44 UTC)
Expired
Aug 4, 2012, 12:45 AM CDT
In force
61 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Dakota County, MN, Goodhue County, MN, Washington County, MN, Dunn County, WI, Pepin County, WI, Pierce County, WI

The radar

The Minneapolis radar (KMPX), 96 km from the middle of the area, began a volume at 04:44 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 4, 12:10 AM CDTTSTM WND DMGRed Wing, MNQUITE A FEW EIGHT INCH BRANCHES DOWN IN THE DOWNTOWN AREA.
Aug 4, 12:30 AM CDTTSTM WND DMG1 E Bay City, WITREE DOWN ACROSS HIGHWAY 35.

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 4.7 hours before the alert went out and 98 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.

276 
WUUS53 KMPX 040444
SVRMPX
MNC037-049-163-WIC033-091-093-040545-
/O.NEW.KMPX.SV.W.0257.120804T0444Z-120804T0545Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1144 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  GOODHUE COUNTY IN SOUTHEAST MINNESOTA...
  SOUTHEASTERN WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN DUNN COUNTY IN WEST CENTRAL WISCONSIN...
  PEPIN COUNTY IN WEST CENTRAL WISCONSIN...
  PIERCE COUNTY IN WEST CENTRAL WISCONSIN...

* UNTIL 1245 AM CDT

* AT 1139 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 WOODBURY TO MIESVILLE TO
  BOMBAY...AND MOVING EAST AT 50 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  RED WING...
  RIVER FALLS...
  ELLSWORTH...
  DURAND...
  WANAMINGO...
  PRESCOTT...
  HADER...
  MIESVILLE...
  WASTEDO...
  HASTINGS...
  BOMBAY...
  CANNON FALLS...
  WELCH...
  ZUMBROTA...

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 4488 9290 4488 9276 4487 9276 4485 9173
      4459 9178 4459 9201 4440 9209 4445 9225
      4445 9241 4437 9242 4436 9245 4435 9254
      4419 9256 4419 9290
TIME...MOT...LOC 0444Z 271DEG 42KT 4489 9276 4455 9273
          4427 9277
WIND...HAIL 60MPH <.75IN

$$
SPD
2 follow-up statements
039 
WWUS53 KMPX 040514
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1214 AM CDT SAT AUG 4 2012

MNC037-163-040529-
/O.CAN.KMPX.SV.W.0257.000000T0000Z-120804T0545Z/
DAKOTA MN-WASHINGTON MN-
1214 AM CDT SAT AUG 4 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHINGTON AND
EAST CENTRAL DAKOTA COUNTIES IS CANCELLED...

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

LAT...LON 4419 9283 4463 9278 4463 9274 4471 9273
      4473 9277 4487 9276 4485 9173 4459 9178
      4459 9201 4440 9209 4445 9225 4445 9241
      4437 9242 4435 9254 4419 9256
TIME...MOT...LOC 0514Z 271DEG 38KT 4488 9232 4454 9230
          4426 9234

$$

MNC049-WIC033-091-093-040545-
/O.CON.KMPX.SV.W.0257.000000T0000Z-120804T0545Z/
GOODHUE MN-DUNN WI-PEPIN WI-PIERCE WI-
1214 AM CDT SAT AUG 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR PIERCE...
PEPIN...SOUTHERN DUNN AND EASTERN GOODHUE COUNTIES UNTIL 1245 AM
CDT...

AT 1211 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 MARTEL TO
FRONTENAC TO 8 MILES EAST OF MAZEPPA...MOVING EAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
  DURAND...STOCKHOLM...SPRING VALLEY...PLUM CITY...ELMWOOD...PEPIN...
  PORCUPINE...ELLA...ARKANSAW AND EAU GALLE.

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 4419 9283 4463 9278 4463 9274 4471 9273
      4473 9277 4487 9276 4485 9173 4459 9178
      4459 9201 4440 9209 4445 9225 4445 9241
      4437 9242 4435 9254 4419 9256
TIME...MOT...LOC 0514Z 271DEG 38KT 4488 9232 4454 9230
          4426 9234
WIND...HAIL 60MPH <.75IN

$$
SPD
640 
WWUS53 KMPX 040535
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1235 AM CDT SAT AUG 4 2012

MNC049-WIC033-091-093-040545-
/O.CON.KMPX.SV.W.0257.000000T0000Z-120804T0545Z/
GOODHUE MN-DUNN WI-PEPIN WI-PIERCE WI-
1235 AM CDT SAT AUG 4 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR PIERCE...
PEPIN...SOUTHERN DUNN AND EASTERN GOODHUE 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 6 MILES SOUTH
OF KNAPP TO ELLA TO 7 MILES NORTHEAST OF PLAINVIEW...MOVING EAST AT
45 MPH.

LOCATIONS IMPACTED INCLUDE...
  DURAND
  RED WING
  PLUM CITY
  ELLSWORTH
  GOODHUE.

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 4419 9272 4464 9260 4487 9255 4485 9173
      4459 9178 4459 9201 4440 9209 4445 9225
      4445 9241 4437 9242 4435 9254 4419 9256
TIME...MOT...LOC 0534Z 271DEG 38KT 4487 9202 4453 9200
          4425 9205
WIND...HAIL 60MPH <.75IN

$$

SPD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 11:12 PM CDTSevere Thunderstorm WarningMPXPolk33 min
Aug 3, 11:38 PM CDTSevere Thunderstorm WarningMPXBarron, Dunn, Polk, Saint Croix67 min
Aug 4, 12:43 AM CDTSpecial Weather StatementMPXBarron, Chippewa, Dunn, Eau Claire, Pepin, Rusk62 min
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, 11:18 PM CDTSevere Thunderstorm WarningMPXDakota, Goodhue, Rice, Scott, Washington42 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

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.