Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 274, NWS Twin Cities, MN

August 23, 2012Carver County, Hennepin County, Scott County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 2012, 9:02 PM CDT for Carver County, Hennepin County, Scott County, Minnesota. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 23, 2012, 9:02 PM CDT (02:02 UTC)
Expired
Aug 23, 2012, 9:25 PM CDT
In force
23 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
65.0 mph

Counties Carver County, MN, Hennepin County, MN, Scott County, MN

The radar

The Minneapolis radar (KMPX), 16 km from the middle of the area, began a volume at 02:03 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.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.0 hours before the alert went out and 18 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 2012-08-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1357 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 00:00Z on 2012-08-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 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
1357 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
1842 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
223 m²/s²
Significant tornado parameter
0.1
Supercell composite
8.5

Open this sounding in Storm Lab

The text

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

249 
WUUS53 KMPX 240202
SVRMPX
MNC019-053-139-240245-
/O.NEW.KMPX.SV.W.0274.120824T0202Z-120824T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
902 PM CDT THU AUG 23 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  SOUTHERN HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  NORTHEASTERN SCOTT COUNTY IN EAST CENTRAL MINNESOTA...

* UNTIL 945 PM CDT

* AT 858 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS OF 65 MPH. THIS
  STORM WAS LOCATED NEAR WACONIA...OR ABOUT 26 MILES WEST OF
  BURNSVILLE...AND MOVING EAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  MINNEAPOLIS...
  EXCELSIOR...
  MINNETONKA...
  EDEN PRAIRIE...
  THE LAKE MINNETONKA AREA...
  PLYMOUTH...
  ST LOUIS PARK...
  BLOOMINGTON...
  TWIN CITIES AIRPORT...
  VICTORIA...
  CARVER...
  MOUND...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4475 9368 4503 9369 4506 9328 4504 9328
      4503 9321 4491 9320 4487 9318 4481 9326
      4479 9333 4476 9333
TIME...MOT...LOC 0202Z 259DEG 31KT 4486 9374
WIND...HAIL 65MPH 1.00IN

$$

JRB
2 follow-up statements
331 
WWUS53 KMPX 240219
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
919 PM CDT THU AUG 23 2012

MNC019-053-139-240245-
/O.CON.KMPX.SV.W.0274.000000T0000Z-120824T0245Z/
CARVER MN-HENNEPIN MN-SCOTT MN-
919 PM CDT THU AUG 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTH CENTRAL
SCOTT...SOUTHERN HENNEPIN AND EAST CENTRAL CARVER COUNTIES UNTIL 945
PM CDT...

AT 916 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING
WINDS OF 60 MPH.  THIS STORM WAS LOCATED 5 MILES WEST OF EDEN
PRAIRIE...OR 14 MILES WEST OF BURNSVILLE...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  MINNEAPOLIS...MINNETONKA...EDEN PRAIRIE...THE LAKE MINNETONKA
  AREA...PLYMOUTH...ST LOUIS PARK...BLOOMINGTON...TWIN CITIES
  AIRPORT...DEEPHAVEN...SHAKOPEE...WOODLAND...WAYZATA...HOPKINS...
  MEDICINE LAKE AND EDINA.

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 4475 9368 4503 9369 4506 9328 4504 9328
      4503 9321 4491 9320 4487 9318 4481 9326
      4479 9333 4476 9333
TIME...MOT...LOC 0219Z 259DEG 31KT 4483 9352
WIND...HAIL 60MPH 1.00IN

$$

JRB
541 
WWUS53 KMPX 240225
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
925 PM CDT THU AUG 23 2012

MNC019-053-139-240238-
/O.CAN.KMPX.SV.W.0274.000000T0000Z-120824T0245Z/
CARVER MN-HENNEPIN MN-SCOTT MN-
925 PM CDT THU AUG 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL SCOTT...SOUTHERN
HENNEPIN AND EAST CENTRAL CARVER COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 4475 9368 4503 9369 4506 9328 4504 9328
      4503 9321 4491 9320 4487 9318 4481 9326
      4479 9333 4476 9333
TIME...MOT...LOC 0223Z 259DEG 31KT 4477 9346

$$

JRB

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 23, 7:02 PM CDTSpecial Weather StatementMPXWright28 min
Aug 23, 7:08 PM CDTSpecial Weather StatementMPXRedwood52 min
Aug 23, 7:12 PM CDTSevere Thunderstorm WarningMPXWright33 min
Aug 23, 7:46 PM CDTSevere Thunderstorm WarningMPXCarver, McLeod, Wright44 min
Aug 23, 7:53 PM CDTSevere Thunderstorm WarningMPXRenville, Sibley37 min
Aug 23, 8:07 PM CDTSevere Thunderstorm WarningMPXMcLeod, Sibley38 min
Aug 23, 8:37 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, McLeod, Sibley38 min
Aug 23, 8:47 PM CDTAreal Flood AdvisoryMPXCarver, Hennepin, McLeod, Wright3 hr
Aug 23, 8:49 PM CDTTornado WarningMPXCarver14 min
Aug 23, 9:00 PM CDTSpecial Weather StatementMPXCarver, Dakota, Hennepin, Ramsey, Scott, Washington and 1 more90 min
Aug 23, 9:32 PM CDTAreal Flood AdvisoryMPXCarver, Dakota, Hennepin, Ramsey, Scott3 hr
Aug 23, 10:33 PM CDTFlash Flood WarningMPXCarver, Wright2 hr
Aug 23, 10:43 PM CDTSpecial Weather StatementMPXScott47 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.