Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 236, NWS Twin Cities, MN

August 6, 2011Carver County, McLeod County, Sibley County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 6, 2011, 8:46 PM CDT for Carver County, McLeod County, Sibley County, Minnesota. It was in force for 44 min. 2 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 6, 2011, 8:46 PM CDT (01:46 UTC)
Expired
Aug 6, 2011, 9:30 PM CDT
In force
44 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.25 in
Wind
50.0 mph

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

The radar

The Minneapolis radar (KMPX), 25 km from the middle of the area, began a volume at 01:49 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 6, 9:15 PM CDTHAIL 1.751 Sw Norwood/Young Amer, MNGOLF BALL SIZE HAIL REPORTED NEAR HWY 212.
Aug 6, 9:23 PM CDTHAIL 11 Sw Norwood/Young Amer, MNQUARTER SIZED HAIL REPORTED.

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, 1.8 hours before the alert went out and 22 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 2011-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 931 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 2011-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
931 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
1415 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

339 
WUUS53 KMPX 070146
SVRMPX
MNC019-085-143-070230-
/O.NEW.KMPX.SV.W.0236.110807T0146Z-110807T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
846 PM CDT SAT AUG 6 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 930 PM CDT

* AT 844 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR LESTER
  PRAIRIE...OR ABOUT 15 MILES EAST OF HUTCHINSON...AND MOVING
  SOUTHEAST AT 35 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  LESTER PRAIRIE...
  WINSTED...
  NEW GERMANY...
  PLATO...
  MAYER...
  NORWOOD/YOUNG AMERICA...
  HAMBURG...
  WACONIA...
  COLOGNE...
  CARVER...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL OVER NORTHEAST 
MCLEOD COUNTY. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY 
AWAY FROM WINDOWS!

&&

LAT...LON 4484 9424 4499 9409 4478 9359 4474 9363
      4471 9361 4469 9364 4470 9367 4463 9376
      4463 9379 4463 9381 4460 9388
TIME...MOT...LOC 0145Z 305DEG 29KT 4486 9406
WIND...HAIL <50MPH 1.25IN

$$
1 follow-up statement
860 
WWUS53 KMPX 070215
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
915 PM CDT SAT AUG 6 2011

MNC085-070229-
/O.CAN.KMPX.SV.W.0236.000000T0000Z-110807T0230Z/
MCLEOD MN-
915 PM CDT SAT AUG 6 2011

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

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

LAT...LON 4470 9404 4471 9404 4490 9387 4478 9359
      4474 9363 4470 9362 4469 9364 4470 9367
      4463 9376 4463 9381 4460 9388
TIME...MOT...LOC 0214Z 305DEG 29KT 4472 9379

$$

MNC019-143-070230-
/O.CON.KMPX.SV.W.0236.000000T0000Z-110807T0230Z/
CARVER MN-SIBLEY MN-
915 PM CDT SAT AUG 6 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
SIBLEY AND CARVER COUNTIES UNTIL 930 PM CDT...

AT 913 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS 
LOCATED NEAR COLOGNE...MOVING SOUTHEAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  CARVER.
  RURAL SOUTHERN CARVER COUNTY.

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

&&

LAT...LON 4470 9404 4471 9404 4490 9387 4478 9359
      4474 9363 4470 9362 4469 9364 4470 9367
      4463 9376 4463 9381 4460 9388
TIME...MOT...LOC 0214Z 305DEG 29KT 4472 9379
WIND...HAIL <50MPH 1.00IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 7:12 PM CDTSevere Thunderstorm WarningMPXMeeker, Stearns, Wright33 min
Aug 6, 7:16 PM CDTSpecial Weather StatementMPXMeeker44 min
Aug 6, 8:13 PM CDTSpecial Weather StatementMPXMcLeod47 min
Aug 6, 8:17 PM CDTSevere Thunderstorm WarningMPXMcLeod, Meeker, Wright43 min
Aug 6, 9:45 PM CDTSevere Thunderstorm WarningMPXDakota, Le Sueur, Rice, Scott45 min
Aug 6, 10:32 PM CDTSpecial Weather StatementMPXSteele43 min
Aug 7, 7:27 AM CDTRiver Flood WarningMPXTodd5 days

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011Every severe thunderstorm warning in 2011

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.