Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 273, NWS Twin Cities, MN

August 23, 20124 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 2012, 8:37 PM CDT for 4 counties in Minnesota. It was in force for 38 min. 4 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 23, 2012, 8:37 PM CDT (01:37 UTC)
Expired
Aug 23, 2012, 9:15 PM CDT
In force
38 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.25 in
Wind
65.0 mph

Counties Carver County, MN, Hennepin County, MN, McLeod County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 27 km from the middle of the area, began a volume at 01:39 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 23, 8:43 PM CDTTORNADO3 Ne Plato, MNTORNADO RATED EF-0. IT MOVED EAST-NORTHEAST AND WAS ON THE GROUND FOR 3.2 MILES. CORN AND A FEW DOZEN TREES WERE DAMAGED AS THE TORNADO GENERALLY MOVED ACROSS SOME FIELDS. A BARN WAS DESTROYED. ONE TREE FELL ON A HOUSE.
Aug 23, 8:44 PM CDTHAIL 1Lester Prairie, MN
Aug 23, 8:52 PM CDTTSTM WND DMGNorwood/Young America, MNNUMEROUS TREES DOWN.
Aug 23, 8:59 PM CDTTSTM WND DMGMayer, MN6 INCH DIAMETER BRANCH DOWN.

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 00:00Z, 1.6 hours before the alert went out and 25 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2012-08-24The 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.

136 
WUUS53 KMPX 240137
SVRMPX
MNC019-053-085-143-240215-
/O.NEW.KMPX.SV.W.0273.120824T0137Z-120824T0215Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CARVER COUNTY IN EAST CENTRAL MINNESOTA...
  WEST CENTRAL HENNEPIN COUNTY IN EAST CENTRAL MINNESOTA...
  EASTERN MCLEOD COUNTY IN CENTRAL MINNESOTA...
  NORTHEASTERN SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 915 PM CDT

* AT 835 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING HALF DOLLAR SIZE HAIL AND DAMAGING WINDS OF 65 MPH. THIS
  STORM WAS LOCATED NEAR GLENCOE...OR ABOUT 16 MILES SOUTHEAST OF    
  HUTCHINSON...AND MOVING EAST AT 35 MPH. THIS STORM HAS A HISTORY   
  OF PRODUCING TREE DAMAGE AND HALF DOLLAR SIZE HAIL.

LOCATIONS IN THE WARNING INCLUDE...
  WACONIA...
  GREEN ISLE...
  PLATO...
  HAMBURG...
  LESTER PRAIRIE...
  WINSTED...
  NORWOOD/YOUNG AMERICA...
  NEW GERMANY...
  MAYER...
  COLOGNE...
  WATERTOWN...
  ST BONIFACIUS...

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 4466 9414 4496 9417 4498 9400 4498 9377
      4502 9376 4503 9367 4470 9364
TIME...MOT...LOC 0136Z 248DEG 30KT 4478 9409
WIND...HAIL 65MPH 1.25IN

$$

JRB
3 follow-up statements
639 
WWUS53 KMPX 240145
SVSMPX

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

MNC143-240159-
/O.CAN.KMPX.SV.W.0273.000000T0000Z-120824T0215Z/
SIBLEY MN-
845 PM CDT THU AUG 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN SIBLEY COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4472 9364 4472 9414 4491 9416 4498 9377
      4502 9376 4503 9367
TIME...MOT...LOC 0144Z 248DEG 30KT 4475 9397

$$

MNC019-053-085-240215-
/O.CON.KMPX.SV.W.0273.000000T0000Z-120824T0215Z/
CARVER MN-HENNEPIN MN-MCLEOD MN-
845 PM CDT THU AUG 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
MCLEOD...WEST CENTRAL HENNEPIN AND CARVER COUNTIES UNTIL 915 PM
CDT...

AT 839 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE
WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 6 MILES EAST OF
GLENCOE...OR 20 MILES SOUTHEAST OF HUTCHINSON...MOVING EAST AT 35
MPH.

LOCATIONS IMPACTED INCLUDE...
  WACONIA...NORWOOD/YOUNG AMERICA...NEW GERMANY...MAYER...COLOGNE...
  WATERTOWN...ST BONIFACIUS...MINNETRISTA...VICTORIA AND
  INDEPENDENCE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. 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 4472 9364 4472 9414 4491 9416 4498 9377
      4502 9376 4503 9367
TIME...MOT...LOC 0144Z 248DEG 30KT 4475 9397
WIND...HAIL 70MPH 1.00IN

$$

JRB
088 
WWUS53 KMPX 240157
SVSMPX

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

MNC085-240212-
/O.CAN.KMPX.SV.W.0273.000000T0000Z-120824T0215Z/
MCLEOD MN-
857 PM CDT THU AUG 23 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN MCLEOD COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4472 9364 4474 9401 4492 9400 4498 9377
      4502 9376 4503 9367
TIME...MOT...LOC 0157Z 248DEG 30KT 4474 9380

$$

MNC019-053-240215-
/O.CON.KMPX.SV.W.0273.000000T0000Z-120824T0215Z/
CARVER MN-HENNEPIN MN-
857 PM CDT THU AUG 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
HENNEPIN AND CARVER COUNTIES UNTIL 915 PM CDT...

AT 853 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE
WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 4 MILES EAST OF
WACONIA...OR 28 MILES WEST OF BURNSVILLE...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  WACONIA...COLOGNE...ST BONIFACIUS...MINNETRISTA...VICTORIA AND
  INDEPENDENCE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. 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 4472 9364 4474 9401 4492 9400 4498 9377
      4502 9376 4503 9367
TIME...MOT...LOC 0157Z 248DEG 30KT 4474 9380
WIND...HAIL 70MPH 1.00IN

$$

JRB
794 
WWUS53 KMPX 240207
SVSMPX

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

MNC019-053-240215-
/O.CON.KMPX.SV.W.0273.000000T0000Z-120824T0215Z/
CARVER MN-HENNEPIN MN-
907 PM CDT THU AUG 23 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR WEST CENTRAL
HENNEPIN AND CENTRAL CARVER COUNTIES UNTIL 915 PM CDT...

AT 903 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DESTRUCTIVE
WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 11 MILES SOUTHEAST
OF WACONIA...OR 21 MILES WEST OF BURNSVILLE...MOVING EAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST BONIFACIUS...MINNETRISTA...VICTORIA AND INDEPENDENCE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE WINDS...WHICH CAN UPROOT
TREES...DOWN POWER LINES...AND CAUSE DAMAGE TO ROOFS AND WINDOWS.
EVACUATE MOBILE HOMES AS THEY MAY BE OVERTURNED. LARGE HAIL IS ALSO
EXPECTED...WHICH CAN CAUSE DAMAGE TO VEHICLES AND WINDOWS. 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 4472 9364 4474 9393 4494 9392 4498 9377
      4502 9376 4503 9367
TIME...MOT...LOC 0207Z 248DEG 30KT 4472 9366
WIND...HAIL 70MPH 1.00IN

$$

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, 8:47 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, 9:02 PM CDTSevere Thunderstorm WarningMPXCarver, Hennepin, Scott23 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.