Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 241, NWS Twin Cities, MN

August 23, 20116 counties in Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Aug 23, 2011, 2:55 AM CDT for 6 counties in Minnesota. It was in force for 65 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: Aug 23, 2011, 2:55 AM CDT (07:55 UTC)
Expired: Aug 23, 2011, 4:00 AM CDT
In force: 65 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Douglas County, MN, Pope County, MN, Stearns County, MN, Stevens County, MN, Swift County, MN, Todd County, MN

The radar

The Minneapolis radar (KMPX), 170 km from the middle of the area, began a volume at 07:54 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 00:00Z, 7.9 hours before the alert went out and 168 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 114 J/kg
Mixed-layer CIN: -258 J/kg
Mixed-layer LCL: 1559 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

057 
WUUS53 KMPX 230755
SVRMPX
MNC041-121-145-149-151-153-230900-
/O.NEW.KMPX.SV.W.0241.110823T0755Z-110823T0900Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
255 AM CDT TUE AUG 23 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN DOUGLAS COUNTY IN WEST CENTRAL MINNESOTA...
  POPE COUNTY IN WEST CENTRAL MINNESOTA...
  NORTHWESTERN STEARNS COUNTY IN CENTRAL MINNESOTA...
  SOUTHEASTERN STEVENS COUNTY IN WEST CENTRAL MINNESOTA...
  NORTHERN SWIFT COUNTY IN WEST CENTRAL MINNESOTA...
  TODD COUNTY IN CENTRAL MINNESOTA...

* UNTIL 400 AM CDT

* AT 250 AM CDT...RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS...
  CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING WINDS IN EXCESS
  OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM
  HEWITT TO 6 MILES WEST OF FORADA TO 5 MILES SOUTHEAST OF           
  ARTICHOKE...AND MOVING EAST AT 35 MPH. WINDS WERE ESTIMATED AT     
  OVER 50 MPH ALONG WITH DIME SIZED HAIL 241 AM IN BRANDON WHICH     
  IS ABOUT 15 MILES WEST OF ALEXANDRIA

LOCATIONS IN THE WARNING INCLUDE...
  ALEXANDRIA...
  GLENWOOD...
  STAPLES...
  LONG PRAIRIE...
  MILTONA...
  CYRUS...
  HEWITT...
  CARLOS...
  LOWRY...
  HANCOCK...
  BERTHA...
  FORADA...
  ROSE CITY...
  STARBUCK...

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.

&&

LAT...LON 4635 9465 4578 9465 4577 9460 4541 9509
      4541 9525 4536 9526 4535 9613 4539 9613
      4580 9558 4612 9538 4611 9515 4631 9517
      4637 9515 4638 9473
TIME...MOT...LOC 0754Z 270DEG 29KT 4634 9509 4580 9544
          4535 9603
WIND...HAIL 60MPH 1.00IN

$$

BAP

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 23, 12:08 AM CDT	Special Weather Statement	MPX	Martin, Watonwan	52 min
Aug 23, 12:44 AM CDT	Special Weather Statement	MPX	Redwood	46 min
Aug 23, 1:24 AM CDT	Special Weather Statement	MPX	Renville	51 min
Aug 23, 2:01 AM CDT	Special Weather Statement	MPX	Nicollet	44 min
Aug 23, 2:04 AM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet	26 min
Aug 23, 2:13 AM CDT	Special Weather Statement	MPX	Douglas, Stevens	62 min
Aug 23, 2:24 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens, Todd	66 min
Aug 23, 2:30 AM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Nicollet, Rice, Sibley	45 min
Aug 23, 2:51 AM CDT	Special Weather Statement	MPX	Freeborn	39 min
Aug 23, 2:57 AM CDT	Special Weather Statement	MPX	Carver	48 min
Aug 23, 3:08 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Lac qui Parle, Swift	67 min
Aug 23, 3:12 AM CDT	Severe Thunderstorm Warning	MPX	Scott	33 min
Aug 23, 3:38 AM CDT	Severe Thunderstorm Warning	MPX	Chippewa, Kandiyohi, Lac qui Parle, Meeker, Pope, Stearns and 2 more	56 min
Aug 23, 3:40 AM CDT	Special Weather Statement	MPX	Dakota	50 min
Aug 23, 4:04 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi, McLeod, Meeker, Renville, Stearns, Yellow Medicine	56 min
Aug 23, 4:28 AM CDT	Special Weather Statement	MPX	Benton, Isanti, McLeod, Renville, Sherburne, Wright	47 min
Aug 23, 5:12 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Carver, Hennepin, Wright	46 min
Aug 23, 5:30 AM CDT	Severe Thunderstorm Warning	MPX	Anoka, Dakota, Ramsey	46 min
Aug 23, 5:52 AM CDT	Special Weather Statement	MPX	Washington	38 min
Aug 23, 6:12 AM CDT	Severe Thunderstorm Warning	MPX	Faribault	33 min
Aug 23, 6:42 AM CDT	Special Weather Statement	MPX	Freeborn	33 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.