Alert archive / Minnesota / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 40, NWS Twin Cities, MN

July 21, 2009Benton County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 21, 2009, 2:22 PM CDT for Benton County, Minnesota. It was in force for 38 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: Jul 21, 2009, 2:22 PM CDT (19:22 UTC)
Expired: Jul 21, 2009, 3:00 PM CDT
In force: 38 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon

County Benton County, MN

The radar

The Minneapolis radar (KMPX), 100 km from the middle of the area, began a volume at 19:22 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 12:00Z, 7.4 hours before the alert went out and 99 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: 187 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 527 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS53 KMPX 211922
SVRMPX
MNC009-212000-
/O.NEW.KMPX.SV.W.0040.090721T1922Z-090721T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
222 PM CDT TUE JUL 21 2009

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BENTON COUNTY IN CENTRAL MINNESOTA...

* UNTIL 300 PM CDT

* AT 220 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM...CAPABLE OF
  PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 3 MILES NORTH
  OF MAYHEW...OR ABOUT 14 MILES NORTHEAST OF ST CLOUD...AND MOVING
  SOUTHEAST AT 10 MPH.

* LOCATIONS IN THE WARNING INCLUDE...
  MAYHEW...
  GILMAN...
  PARENT...
  RONNEBY...
  FOLEY...

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 4578 9379 4561 9379 4560 9398 4572 9415
      4579 9398
TIME...MOT...LOC 1922Z 308DEG 10KT 4573 9403

$$

1 follow-up statement

296 
WWUS53 KMPX 211940
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
240 PM CDT TUE JUL 21 2009

MNC009-212000-
/O.CON.KMPX.SV.W.0040.000000T0000Z-090721T2000Z/
BENTON MN-
240 PM CDT TUE JUL 21 2009

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR CENTRAL BENTON COUNTY...

AT 238 PM CDT...RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM...
CAPABLE OF PRODUCING QUARTER SIZE HAIL. THE SEVERE STORM WAS LOCATED
NEAR GILMAN...OR ABOUT 2 MILES SOUTHWEST OF GILMAN...AND MOVING
SOUTHEAST AT 10 MPH.

AT 210 PM CDT...QUARTER SIZE HAIL WAS REPORTED JUST SOUTH OF LITTLE 
ROCK WITH THIS STORM.

OTHER LOCATIONS IN THE WARNING INCLUDE...FOLEY...RONNEBY AND PARENT.

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 4578 9379 4561 9379 4560 9398 4572 9415
      4579 9398
TIME...MOT...LOC 1939Z 308DEG 10KT 4571 9399

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 12:51 PM CDT	Special Weather Statement	MPX	Morrison	39 min
Jul 21, 1:26 PM CDT	Special Weather Statement	MPX	Morrison	49 min
Jul 21, 1:58 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Morrison	47 min
Jul 21, 2:15 PM CDT	Special Weather Statement	MPX	Carver	45 min
Jul 21, 2:28 PM CDT	Special Weather Statement	MPX	Sherburne	47 min
Jul 21, 2:43 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth	47 min
Jul 21, 2:53 PM CDT	Severe Thunderstorm Warning	MPX	Benton, Sherburne	37 min
Jul 21, 3:19 PM CDT	Special Weather Statement	MPX	Washington	41 min
Jul 21, 3:24 PM CDT	Special Weather Statement	MPX	Wright	51 min
Jul 21, 3:31 PM CDT	Special Weather Statement	MPX	Faribault	44 min
Jul 21, 3:43 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Sherburne, Wright	62 min
Jul 21, 3:52 PM CDT	Severe Thunderstorm Warning	MPX	Hennepin, Wright	53 min
Jul 21, 4:11 PM CDT	Severe Thunderstorm Warning	MPX	Anoka, Hennepin	49 min
Jul 21, 4:16 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin, Wright	44 min
Jul 21, 4:19 PM CDT	Severe Thunderstorm Warning	MPX	Washington	41 min
Jul 21, 4:36 PM CDT	Severe Thunderstorm Warning	MPX	Anoka	24 min
Jul 21, 4:53 PM CDT	Severe Thunderstorm Warning	MPX	Carver, Hennepin	36 min
Jul 21, 4:56 PM CDT	Severe Thunderstorm Warning	MPX	Le Sueur, Nicollet, Sibley	49 min
Jul 21, 5:02 PM CDT	Severe Thunderstorm Warning	MPX	Dakota, Washington	43 min
Jul 21, 5:05 PM CDT	Severe Thunderstorm Warning	MPX	Ramsey	24 min
Jul 21, 5:10 PM CDT	Areal Flood Advisory	MPX	Washington	2 hr
Jul 21, 5:54 PM CDT	Special Weather Statement	MPX	Dakota	51 min
Jul 21, 6:18 PM CDT	Special Weather Statement	MPX	Waseca	42 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2009 Every severe thunderstorm warning in 2009

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.