Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 521, NWS Norman, OK

August 12, 20114 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 12, 2011, 10:12 PM CDT for 4 counties in Oklahoma. It was in force for 63 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 12, 2011, 10:12 PM CDT (03:12 UTC)
Expired: Aug 12, 2011, 11:15 PM CDT
In force: 63 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Beckham County, OK, Greer County, OK, Kiowa County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 94 km from the middle of the area, began a volume at 03:15 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 12, 9:44 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 3.2 hours before the alert went out and 184 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: 34 J/kg
Mixed-layer CIN: -393 J/kg
Mixed-layer LCL: 2505 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -194 m²/s²
0-3 km storm-relative helicity: -181 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.

583 
WUUS54 KOUN 130312
SVROUN
OKC009-055-075-149-130415-
/O.NEW.KOUN.SV.W.0521.110813T0312Z-110813T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
1012 PM CDT FRI AUG 12 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GREER COUNTY IN SOUTHWEST OKLAHOMA...
  NORTHERN KIOWA COUNTY IN SOUTHWEST OKLAHOMA...
  EASTERN BECKHAM COUNTY IN WESTERN OKLAHOMA...
  WASHITA COUNTY IN WESTERN OKLAHOMA...

* UNTIL 1115 PM CDT

* AT 1011 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED SEVERE  
  THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTH OF
  BESSIE TO 7 MILES SOUTH OF DELHI...MOVING EAST AT 40 MPH. WINDS OF
  64 MPH WERE MEASURED NEAR BESSIE.

HAZARDS IN THE WARNING INCLUDE...
WIND GUSTS TO 65 MPH...

* LOCATIONS IN THE WARNING INCLUDE ALTUS-LUGERT LAKE...BESSIE...
  BRINKMAN...BURNS FLAT...CANUTE...CARTER...CLOUD CHIEF...COLONY...
  CORDELL...CORN...COWDEN...DELHI...DILL CITY...ELK CITY...FOSS...
  GOTEBO...GRANITE...HOBART...LONE WOLF...MANGUM...MOUNTAIN VIEW...
  RETROP...ROCKY...SAYRE...SENTINEL AND WILLOW.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 18 AND 61.

LAT...LON 3547 9944 3546 9862 3516 9862 3487 9892
      3486 9973 3495 9973 3494 9988 3502 9989
      3503 9997
TIME...MOT...LOC 0311Z 265DEG 33KT 3546 9897 3508 9965

$$


..SPEG.

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 12, 7:29 PM CDT	Special Weather Statement	OUN	Payne	31 min
Aug 12, 7:31 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant, Major, Woods	59 min
Aug 12, 7:48 PM CDT	Special Weather Statement	OUN	Logan	27 min
Aug 12, 8:13 PM CDT	Special Weather Statement	OUN	Noble	32 min
Aug 12, 8:19 PM CDT	Special Weather Statement	OUN	Major	16 min
Aug 12, 8:26 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble	64 min
Aug 12, 8:32 PM CDT	Special Weather Statement	OUN	Blaine	13 min
Aug 12, 9:15 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan	60 min
Aug 12, 9:29 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Grant, Kay, Noble, Payne	61 min
Aug 12, 9:38 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey	52 min
Aug 12, 9:49 PM CDT	Special Weather Statement	OUN	Canadian, Oklahoma	26 min
Aug 12, 10:21 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	32 min
Aug 12, 10:31 PM CDT	Special Weather Statement	OUN	Caddo	29 min
Aug 12, 10:41 PM CDT	Special Weather Statement	OUN	Canadian, Cleveland, Grady, McClain	19 min
Aug 12, 11:11 PM CDT	Special Weather Statement	OUN	Caddo, Grady	19 min
Aug 12, 11:21 PM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson, Kiowa	24 min
Aug 12, 11:41 PM CDT	Special Weather Statement	OUN	Comanche, Grady, Kiowa	19 min
Aug 12, 11:59 PM CDT	Special Weather Statement	OUN	Comanche	31 min
Aug 13, 12:30 AM CDT	Special Weather Statement	OUN	Comanche, Stephens	30 min
Aug 13, 12:49 AM CDT	Special Weather Statement	OUN	Cotton, Jefferson, Tillman	11 min
Aug 13, 12:55 AM CDT	Special Weather Statement	OUN	Kingfisher	20 min
Aug 13, 1:05 AM CDT	Special Weather Statement	OUN	Garvin, McClain	25 min
Aug 13, 1:35 AM CDT	Special Weather Statement	OUN	Garvin, McClain	25 min
Aug 13, 1:49 AM CDT	Heat Advisory	OUN	Carter, Comanche, Cotton, Greer, Harmon, Jackson and 8 more	13 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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.