Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 171, NWS Twin Cities, MN

July 22, 2011Stevens County, Minnesota

NWS Twin Cities, MN issued this severe thunderstorm warning at Jul 22, 2011, 7:11 PM CDT for Stevens County, Minnesota. It was in force for 30 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 22, 2011, 7:11 PM CDT (00:11 UTC)
Expired: Jul 22, 2011, 7:41 PM CDT
In force: 30 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), 171 km from the middle of the area, began a volume at 00:15 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

Aberdeen, SD (KABR), launched 00:00Z, 0.2 hours before the alert went out and 188 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: 3084 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1182 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 377 m²/s²
Significant tornado parameter: 3.8
Supercell composite: 27.3

Open this sounding in Storm Lab

The text

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

261 
WUUS53 KMPX 230011
SVRMPX
MNC149-230115-
/O.NEW.KMPX.SV.W.0171.110723T0011Z-110723T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
711 PM CDT FRI JUL 22 2011

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

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

* UNTIL 815 PM CDT

* AT 706 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 7 MILES WEST OF CHOKIO...OR ABOUT 17 MILES
  SOUTHEAST OF WHEATON...AND MOVING NORTHEAST AT 10 MPH.

LOCATIONS IN THE WARNING INCLUDE...
  CHOKIO...
  ALBERTA...
  LOCATIONS ALONG HIGHWAY 13. 

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 4561 9626 4575 9626 4577 9624 4577 9622
      4563 9595 4546 9624 4547 9625 4557 9625
      4559 9627 4560 9627
TIME...MOT...LOC 0010Z 224DEG 8KT 4560 9630
WIND...HAIL 60MPH 1.00IN

$$

1 follow-up statement

684 
WWUS53 KMPX 230041
SVSMPX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
741 PM CDT FRI JUL 22 2011

MNC149-230056-
/O.CAN.KMPX.SV.W.0171.000000T0000Z-110723T0115Z/
STEVENS MN-
741 PM CDT FRI JUL 22 2011

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN STEVENS COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY...HOWEVER SMALL HAIL AND HEAVY RAIN ARE STILL POSSIBLE WITH
THIS THUNDERSTORM.

LAT...LON 4561 9626 4575 9626 4577 9624 4577 9622
      4563 9595 4546 9624 4547 9625 4557 9625
      4559 9627 4560 9627
TIME...MOT...LOC 0041Z 224DEG 8KT 4565 9623

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 7:55 PM CDT	Special Weather Statement	MPX	Lac qui Parle	50 min
Jul 22, 8:47 PM CDT	Special Weather Statement	MPX	Lac qui Parle	73 min
Jul 23, 3:56 AM CDT	Heat Advisory	MPX	Blue Earth, Brown, Faribault, Freeborn, Goodhue, Le Sueur and 7 more	11 hr
Jul 23, 4:38 AM CDT	Special Weather Statement	MPX	Douglas, Pope, Stevens	67 min
Jul 23, 4:48 AM CDT	Severe Thunderstorm Warning	MPX	Douglas	42 min
Jul 23, 5:21 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Morrison, Pope, Stearns, Todd	54 min
Jul 23, 6:21 AM CDT	Special Weather Statement	MPX	Benton, Kandiyohi, Meeker, Mille Lacs, Morrison, Sherburne and 1 more	69 min
Jul 23, 7:39 AM CDT	Special Weather Statement	MPX	Anoka, Chisago, Isanti, Kanabec, McLeod, Meeker and 5 more	51 min
Jul 23, 8:27 AM CDT	Special Weather Statement	MPX	Carver, Scott	48 min
Jul 23, 8:46 AM CDT	Severe Thunderstorm Warning	MPX	Carver, Le Sueur, Rice, Scott	44 min
Jul 23, 9:17 AM CDT	Severe Thunderstorm Warning	MPX	Dakota, Goodhue, Rice, Scott, Steele	58 min
Jul 23, 10:09 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	51 min
Jul 23, 1:04 PM CDT	Special Weather Statement	MPX	Pope	56 min
Jul 23, 1:53 PM CDT	Special Weather Statement	MPX	Stearns	52 min
Jul 23, 1:55 PM CDT	Special Weather Statement	MPX	Benton	35 min
Jul 23, 2:34 PM CDT	Special Weather Statement	MPX	Sherburne	41 min
Jul 23, 3:08 PM CDT	Special Weather Statement	MPX	Sherburne	37 min
Jul 23, 4:03 PM CDT	Special Weather Statement	MPX	Ramsey, Washington	57 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.