Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 235, NWS Twin Cities, MN

August 6, 2011McLeod County, Meeker County, Wright County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 6, 2011, 8:17 PM CDT for McLeod County, Meeker County, Wright County, Minnesota. It was in force for 43 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 6, 2011, 8:17 PM CDT (01:17 UTC)
Expired
Aug 6, 2011, 9:00 PM CDT
In force
43 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties McLeod County, MN, Meeker County, MN, Wright County, MN

The radar

The Minneapolis radar (KMPX), 50 km from the middle of the area, began a volume at 01:17 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, 8:30 PM CDTHAIL 1.53 Nw Silver Lake, MNQUARTER TO PING-PONG SIZE HAIL REPORTED NEAR 220TH ST.

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, 1.3 hours before the alert went out and 47 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.

885 
WUUS53 KMPX 070117
SVRMPX
MNC085-093-171-070200-
/O.NEW.KMPX.SV.W.0235.110807T0117Z-110807T0200Z/

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

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN MCLEOD COUNTY IN CENTRAL MINNESOTA...
  EAST CENTRAL MEEKER COUNTY IN CENTRAL MINNESOTA...
  SOUTHWESTERN WRIGHT COUNTY IN CENTRAL MINNESOTA...

* UNTIL 900 PM CDT

* AT 812 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED NEAR DASSEL...
  OR ABOUT 9 MILES NORTH OF HUTCHINSON...AND MOVING SOUTHEAST AT 20
  MPH.

LOCATIONS IN THE WARNING INCLUDE...
  DASSEL...
  SILVER LAKE...
  WINSTED...

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.

&&

LAT...LON 4498 9401 4492 9402 4477 9418 4499 9449
      4513 9434
TIME...MOT...LOC 0118Z 308DEG 18KT 4500 9431
WIND...HAIL <50MPH 1.00IN

$$
1 follow-up statement
925 
WWUS53 KMPX 070129
SVSMPX

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

MNC093-070144-
/O.CAN.KMPX.SV.W.0235.000000T0000Z-110807T0200Z/
MEEKER MN-
829 PM CDT SAT AUG 6 2011

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL MEEKER COUNTY IS
CANCELLED...

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

LAT...LON 4499 9425 4506 9418 4498 9401 4492 9402
      4477 9418 4490 9437
TIME...MOT...LOC 0129Z 305DEG 29KT 4493 9420

$$

MNC085-171-070200-
/O.CON.KMPX.SV.W.0235.000000T0000Z-110807T0200Z/
MCLEOD MN-WRIGHT MN-
829 PM CDT SAT AUG 6 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
WRIGHT AND NORTHEASTERN MCLEOD COUNTIES UNTIL 900 PM CDT...

AT 826 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS STORM WAS
LOCATED NEAR SILVER LAKE...OR 8 MILES NORTHEAST OF HUTCHINSON...
MOVING SOUTHEAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  SILVER LAKE AND WINSTED.

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 4499 9425 4506 9418 4498 9401 4492 9402
      4477 9418 4490 9437
TIME...MOT...LOC 0129Z 305DEG 29KT 4493 9420
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, 8:46 PM CDTSevere Thunderstorm WarningMPXCarver, McLeod, Sibley44 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.