Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 236, NWS Twin Cities, MN

July 26, 20124 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 26, 2012, 4:47 PM CDT for 4 counties in Minnesota. It was in force for 43 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
Jul 26, 2012, 4:47 PM CDT (21:47 UTC)
Expired
Jul 26, 2012, 5:30 PM CDT
In force
43 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Le Sueur County, MN, McLeod County, MN, Scott County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 59 km from the middle of the area, began a volume at 21:46 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 12:00Z, 9.8 hours before the alert went out and 57 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 12:00Z on 2012-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2012-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -67 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1848 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
-67 m²/s²
0-3 km storm-relative helicity
-11 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

062 
WUUS53 KMPX 262147
SVRMPX
MNC079-085-139-143-262230-
/O.NEW.KMPX.SV.W.0236.120726T2147Z-120726T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
447 PM CDT THU JUL 26 2012

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN LE SUEUR COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTH CENTRAL MCLEOD COUNTY IN CENTRAL MINNESOTA...
  SOUTHWESTERN SCOTT COUNTY IN EAST CENTRAL MINNESOTA...
  SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 530 PM CDT

* AT 442 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING DAMAGING WINDS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES
  SOUTH OF BROWNTON...OR ABOUT 9 MILES NORTHWEST OF GAYLORD...AND
  MOVING SOUTHEAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  GAYLORD...
  LE SUEUR...
  WINTHROP...
  NEW AUBURN...
  ARLINGTON...
  RUSH RIVER...
  HENDERSON...
  BELLE PLAINE...

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.

&&

LAT...LON 4450 9452 4472 9437 4463 9371 4445 9387
TIME...MOT...LOC 2147Z 294DEG 32KT 4462 9431
WIND...HAIL 60MPH <.75IN

$$
1 follow-up statement
474 
WWUS53 KMPX 262204
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
504 PM CDT THU JUL 26 2012

MNC085-262219-
/O.CAN.KMPX.SV.W.0236.000000T0000Z-120726T2230Z/
MCLEOD MN-
504 PM CDT THU JUL 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MCLEOD COUNTY IS
CANCELLED...

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

LAT...LON 4452 9428 4469 9419 4463 9371 4445 9387
TIME...MOT...LOC 2204Z 288DEG 34KT 4457 9407

$$

MNC079-139-143-262230-
/O.CON.KMPX.SV.W.0236.000000T0000Z-120726T2230Z/
LE SUEUR MN-SCOTT MN-SIBLEY MN-
504 PM CDT THU JUL 26 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
SIBLEY...SOUTHWESTERN SCOTT AND NORTHWESTERN LE SUEUR COUNTIES UNTIL
530 PM CDT...

AT 500 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS OF 60 MPH.  THIS
STORM WAS LOCATED NEAR ARLINGTON...OR 5 MILES EAST OF GAYLORD...
MOVING EAST AT 40 MPH.

LOCATIONS IMPACTED INCLUDE...
  LE SUEUR...HENDERSON AND BELLE PLAINE.

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 4452 9428 4469 9419 4463 9371 4445 9387
TIME...MOT...LOC 2204Z 288DEG 34KT 4457 9407
WIND...HAIL 60MPH <.75IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 8:10 PM CDTSpecial Weather StatementMPXDouglas, Pope, Todd80 min
Jul 25, 9:58 PM CDTSpecial Weather StatementMPXKandiyohi62 min
Jul 26, 4:17 PM CDTSpecial Weather StatementMPXSibley58 min
Jul 26, 5:27 PM CDTSpecial Weather StatementMPXLe Sueur48 min
Jul 26, 5:54 PM CDTSpecial Weather StatementMPXDakota51 min
Jul 26, 6:30 PM CDTSpecial Weather StatementMPXGoodhue45 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.