Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 69, NWS Twin Cities, MN

May 30, 2011Stevens County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at May 30, 2011, 8:40 PM CDT for Stevens County, Minnesota. It was in force for 20 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
May 30, 2011, 8:40 PM CDT (01:40 UTC)
Expired
May 30, 2011, 9:00 PM CDT
In force
20 min
Issued by
NWS Twin Cities, MN
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Stevens County, MN

The radar

The Aberdeen radar (KABR), 182 km from the middle of the area, began a volume at 01:42 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
May 30, 8:50 PM CDTTSTM WND GST 603 N Chokio, MNDOOR OFF MACHINE SHED.
May 30, 8:50 PM CDTTSTM WND GST 60Ese Chokio, MN
May 30, 8:52 PM CDTTSTM WND GST 503 W Chokio, MN
May 30, 8:59 PM CDTHAIL 0.55 N Chokio, MN

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
May 30, 3:52 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.7 hours before the alert went out and 197 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, Aberdeen, SD at 00:00Z on 2011-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1125 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, Aberdeen, SD at 00:00Z on 2011-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 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
1125 J/kg
Mixed-layer CIN
-258 J/kg
Mixed-layer LCL
775 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.0

Open this sounding in Storm Lab

The text

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

709 
WUUS53 KMPX 310140
SVRMPX
MNC149-310200-
/O.NEW.KMPX.SV.W.0069.110531T0140Z-110531T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
840 PM CDT MON MAY 30 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  STEVENS COUNTY IN WEST CENTRAL MINNESOTA...

* UNTIL 900 PM CDT

* AT 835 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS OF 60 MPH.
  THIS STORM WAS LOCATED NEAR CHOKIO...OR ABOUT 15 MILES WEST OF
  MORRIS...AND MOVING NORTH AT 60 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  MORRIS...
  DONNELLY...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT MONDAY EVENING
FOR SOUTHWESTERN MINNESOTA.

&&

LAT...LON 4567 9626 4576 9626 4577 9583 4576 9576
      4558 9576 4541 9594 4541 9612 4540 9618
      4541 9625 4567 9627
TIME...MOT...LOC 0140Z 196DEG 52KT 4560 9618
WIND...HAIL 60MPH 1.00IN

$$
1 follow-up statement
004 
WWUS53 KMPX 310146
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
846 PM CDT MON MAY 30 2011

MNC149-310200-
/O.CON.KMPX.SV.W.0069.000000T0000Z-110531T0200Z/
STEVENS MN-
846 PM CDT MON MAY 30 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR STEVENS COUNTY
UNTIL 900 PM CDT...

AT 844 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND DAMAGING
WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR CHOKIO...OR
13 MILES WEST OF MORRIS...MOVING NORTH AT 60 MPH.

LOCATIONS IMPACTED INCLUDE...
  DONNELLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS SITUATION. IF YOU ARE IN THE PATH OF THIS
STORM...PREPARE IMMEDIATELY FOR DESTRUCTIVE HAIL...WHICH CAN
SIGNIFICANTLY DAMAGE WINDOWS...SIDING AND VEHICLES. DAMAGING WINDS
ARE ALSO EXPECTED...WHICH CAN UPROOT TREES AND DOWN POWER LINES. SEEK
SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 4567 9626 4576 9626 4577 9583 4576 9576
      4558 9576 4541 9594 4541 9612 4540 9618
      4541 9625 4567 9627
TIME...MOT...LOC 0147Z 196DEG 52KT 4568 9614
WIND...HAIL 60MPH 1.75IN

$$

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 8:35 PM CDTSpecial Weather StatementMPXStevens40 min
May 30, 8:59 PM CDTSevere Thunderstorm WarningMPXStevens16 min
May 30, 9:38 PM CDTSevere Thunderstorm WarningMPXLac qui Parle, Yellow Medicine51 min
May 30, 9:57 PM CDTSevere Thunderstorm WarningMPXDouglas48 min
May 30, 10:11 PM CDTSpecial Weather StatementMPXRedwood79 min
May 30, 10:41 PM CDTSpecial Weather StatementMPXTodd49 min
May 30, 11:07 PM CDTSpecial Weather StatementMPXMorrison38 min
May 30, 11:30 PM CDTSevere Thunderstorm WarningMPXMorrison30 min
May 30, 11:59 PM CDTSpecial Weather StatementMPXKanabec31 min
May 31, 3:40 AM CDTWind AdvisoryMPXAnoka, Benton, Blue Earth, Brown, Carver, Chippewa and 36 more18 hr
May 31, 10:51 AM CDTRiver Flood WarningMPXCarver, Hennepin, Scott70 hr

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.