Alert archive / Minnesota / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 248, NWS Twin Cities, MN

August 3, 20127 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 3, 2012, 9:47 PM CDT for 7 counties in Minnesota. It was in force for 58 min. 1 report 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, 9:47 PM CDT (02:47 UTC)
Expired
Aug 3, 2012, 10:45 PM CDT
In force
58 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Blue Earth County, MN, Brown County, MN, McLeod County, MN, Nicollet County, MN, Redwood County, MN, Renville County, MN, Sibley County, MN

The radar

The Minneapolis radar (KMPX), 82 km from the middle of the area, began a volume at 02:49 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, 10:45 PM CDTTSTM WND DMGE Henderson, MNTREE DOWN ACROSS HIGHWAY 19.

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

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.8 hours before the alert went out and 80 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.

295 
WUUS53 KMPX 040247
SVRMPX
MNC013-015-085-103-127-129-143-040345-
/O.NEW.KMPX.SV.W.0248.120804T0247Z-120804T0345Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN BLUE EARTH COUNTY IN SOUTH CENTRAL MINNESOTA...
  BROWN COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTHERN MCLEOD COUNTY IN CENTRAL MINNESOTA...
  NICOLLET COUNTY IN SOUTH CENTRAL MINNESOTA...
  SOUTHEASTERN REDWOOD COUNTY IN SOUTHWEST MINNESOTA...
  SOUTHEASTERN RENVILLE COUNTY IN CENTRAL MINNESOTA...
  SIBLEY COUNTY IN CENTRAL MINNESOTA...

* UNTIL 1045 PM CDT

* AT 944 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 BIRD ISLAND TO EVAN TO
  JEFFERS...AND MOVING EAST AT 50 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  NEW ULM...
  GAYLORD...
  ST PETER...
  EVAN...
  SANBORN...
  FRANKLIN...
  MORGAN...
  MORTON...
  CLEMENTS...
  SPRINGFIELD...
  FAIRFAX...
  HECTOR...
  SLEEPY EYE...
  BUFFALO LAKE...

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 WINDS GUSTS IN EXCESS OF 55 
MPH. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY 
FROM WINDOWS!

&&

LAT...LON 4413 9511 4419 9512 4419 9527 4441 9505
      4475 9496 4476 9401 4472 9401 4472 9389
      4460 9387 4454 9391 4451 9388 4438 9396
      4434 9393 4412 9427
TIME...MOT...LOC 0246Z 273DEG 45KT 4474 9480 4437 9480
          4407 9521
WIND...HAIL 60MPH <.75IN

$$
SPD
2 follow-up statements
775 
WWUS53 KMPX 040314
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1014 PM CDT FRI AUG 3 2012

MNC127-040329-
/O.CAN.KMPX.SV.W.0248.000000T0000Z-120804T0345Z/
REDWOOD MN-
1014 PM CDT FRI AUG 3 2012

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

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

LAT...LON 4416 9496 4455 9464 4475 9463 4476 9401
      4472 9401 4472 9389 4460 9387 4459 9389
      4454 9391 4451 9388 4441 9395 4437 9396
      4434 9393 4412 9427
TIME...MOT...LOC 0314Z 273DEG 45KT 4471 9430 4434 9431
          4405 9473

$$

MNC013-015-085-103-129-143-040345-
/O.CON.KMPX.SV.W.0248.000000T0000Z-120804T0345Z/
BROWN MN-MCLEOD MN-NICOLLET MN-RENVILLE MN-SIBLEY MN-BLUE EARTH MN-
1014 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
BLUE EARTH...SIBLEY...SOUTHEASTERN RENVILLE...NICOLLET...SOUTHERN
MCLEOD AND BROWN COUNTIES UNTIL 1045 PM CDT...

AT 1012 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 BROWNTON TO
KLOSSNER TO DARFUR...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  GAYLORD...ST PETER...COURTLAND...NEW AUBURN...HANSKA...NICOLLET...
  ARLINGTON...NORSELAND...RUSH RIVER...GREEN ISLE...HENDERSON...
  SUMTER...NEW SWEDEN AND NEW ROME.

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 4416 9496 4455 9464 4475 9463 4476 9401
      4472 9401 4472 9389 4460 9387 4459 9389
      4454 9391 4451 9388 4441 9395 4437 9396
      4434 9393 4412 9427
TIME...MOT...LOC 0314Z 273DEG 45KT 4471 9430 4434 9431
          4405 9473
WIND...HAIL 60MPH <.75IN

$$
SPD
156 
WWUS53 KMPX 040331
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
1031 PM CDT FRI AUG 3 2012

MNC129-040346-
/O.CAN.KMPX.SV.W.0248.000000T0000Z-120804T0345Z/
RENVILLE MN-
1031 PM CDT FRI AUG 3 2012

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

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

LAT...LON 4415 9467 4450 9439 4475 9439 4476 9401
      4472 9401 4472 9390 4460 9387 4454 9391
      4451 9388 4447 9392 4438 9396 4434 9393
      4432 9395 4412 9427
TIME...MOT...LOC 0331Z 273DEG 45KT 4469 9400 4432 9401
          4403 9444

$$

MNC013-015-085-103-143-040345-
/O.CON.KMPX.SV.W.0248.000000T0000Z-120804T0345Z/
BROWN MN-MCLEOD MN-NICOLLET MN-SIBLEY MN-BLUE EARTH MN-
1031 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
BLUE EARTH...SIBLEY...NICOLLET...SOUTHERN MCLEOD AND EAST CENTRAL
BROWN COUNTIES UNTIL 1045 PM CDT...

AT 1026 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 GREEN ISLE TO 5
MILES NORTHEAST OF NICOLLET TO LA SALLE...MOVING EAST AT 50 MPH.

LOCATIONS IMPACTED INCLUDE...
  ST PETER AND HENDERSON.

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 4415 9467 4450 9439 4475 9439 4476 9401
      4472 9401 4472 9390 4460 9387 4454 9391
      4451 9388 4447 9392 4438 9396 4434 9393
      4432 9395 4412 9427
TIME...MOT...LOC 0331Z 273DEG 45KT 4469 9400 4432 9401
          4403 9444
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, 9:52 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, 11:18 PM CDTSevere Thunderstorm WarningMPXDakota, Goodhue, Rice, Scott, Washington42 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.