Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 255, NWS Twin Cities, MN

August 3, 20125 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 2012, 11:18 PM CDT for 5 counties in Minnesota. It was in force for 42 min. 6 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, 11:18 PM CDT (04:18 UTC)
Expired
Aug 4, 2012, 12:00 AM CDT
In force
42 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, Rice County, MN, Scott County, MN, Washington County, MN

The radar

The Minneapolis radar (KMPX), 78 km from the middle of the area, began a volume at 04:21 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, 11:25 PM CDTTSTM WND DMGLakeville, MNFEW TREES DOWN...INCLUDING ON POWER LINES.
Aug 3, 11:30 PM CDTTSTM WND DMGFaribault, MNTWO FOOT DIAMETER TREE DOWN ACROSS ROAD NEAR 4TH STREET AND 2ND AVENUE.
Aug 3, 11:35 PM CDTTSTM WND DMG2 Se St Paul Park, MNSIX INCH DIAMETER TREE DOWN AT GRANADA AND 90TH STREET IN COTTAGE GROVE.
Aug 3, 11:35 PM CDTTSTM WND DMGFarmington, MNFEW TREES DOWN.
Aug 4, 12:05 AM CDTTSTM WND DMG3 Se Stanton, MNONE AND ONE QUARTER INCH TREE LIMBS SEVERED.
Aug 4, 12:10 AM CDTTSTM WND DMGRed Wing, MNQUITE A FEW EIGHT INCH BRANCHES DOWN IN THE DOWNTOWN AREA.

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, 4.3 hours before the alert went out and 81 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.

054 
WUUS53 KMPX 040418
SVRMPX
MNC037-049-131-139-163-040500-
/O.NEW.KMPX.SV.W.0255.120804T0418Z-120804T0500Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1118 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DAKOTA COUNTY IN EAST CENTRAL MINNESOTA...
  GOODHUE COUNTY IN SOUTHEAST MINNESOTA...
  RICE COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTHEASTERN SCOTT COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN WASHINGTON COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL MIDNIGHT CDT

* AT 1116 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 BURNSVILLE TO CASTLE ROCK TO
  WARSAW...AND MOVING EAST AT 40 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  FARIBAULT...
  RED WING...
  WARSAW...
  MORRISTOWN...
  ELKO...
  WEBSTER...
  CREDIT RIVER...
  NEW MARKET...
  LAKEVILLE...
  CASTLE ROCK...
  FARMINGTON...
  APPLE VALLEY...
  DUNDAS...
  NORTHFIELD...

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 AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS!

&&

LAT...LON 4473 9337 4488 9276 4475 9280 4471 9272
      4456 9254 4456 9233 4452 9230 4445 9231
      4445 9241 4437 9242 4436 9245 4435 9254
      4422 9255 4422 9345
TIME...MOT...LOC 0418Z 272DEG 34KT 4473 9326 4455 9323
          4425 9338
WIND...HAIL 60MPH <.75IN

$$
SPD
1 follow-up statement
831 
WWUS53 KMPX 040449
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1149 PM CDT FRI AUG 3 2012

MNC139-040504-
/O.CAN.KMPX.SV.W.0255.000000T0000Z-120804T0500Z/
SCOTT MN-
1149 PM CDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SCOTT COUNTY IS
CANCELLED...

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

LAT...LON 4422 9320 4451 9314 4477 9316 4488 9276
      4475 9280 4471 9272 4456 9254 4455 9232
      4452 9230 4445 9231 4445 9241 4437 9242
      4435 9254 4422 9255
TIME...MOT...LOC 0449Z 272DEG 34KT 4472 9285 4453 9282
          4424 9297

$$

MNC037-049-131-163-040500-
/O.CON.KMPX.SV.W.0255.000000T0000Z-120804T0500Z/
DAKOTA MN-GOODHUE MN-RICE MN-WASHINGTON MN-
1149 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHERN
WASHINGTON...EASTERN RICE...GOODHUE AND EASTERN DAKOTA COUNTIES UNTIL
MIDNIGHT CDT...

AT 1144 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 HASTINGS TO
CANNON FALLS TO KENYON...MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  RED WING...MIESVILLE...WASTEDO...BOMBAY...HADER...WELCH...
  WANAMINGO...GOODHUE...ZUMBROTA...BELLECHESTER AND FRONTENAC.

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.

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

&&

LAT...LON 4422 9320 4451 9314 4477 9316 4488 9276
      4475 9280 4471 9272 4456 9254 4455 9232
      4452 9230 4445 9231 4445 9241 4437 9242
      4435 9254 4422 9255
TIME...MOT...LOC 0449Z 272DEG 34KT 4472 9285 4453 9282
          4424 9297
WIND...HAIL 60MPH <.75IN

$$
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, 11:38 PM CDTSevere Thunderstorm WarningMPXChisago, Washington67 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

Nearby

Severe 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.