Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 621, NWS Norman, OK

November 7, 20116 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Nov 7, 2011, 7:25 PM CST for 6 counties in Oklahoma. It was in force for 50 min. 2 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: Nov 7, 2011, 7:25 PM CST (01:25 UTC)
Expired: Nov 7, 2011, 8:15 PM CST
In force: 50 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Comanche County, OK, Greer County, OK, Jackson County, OK, Kiowa County, OK, Tillman County, OK, Washita County, OK

The radar

The Altus AFB radar (KFDR), 40 km from the middle of the area, began a volume at 01:27 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

Time	Report	Where	Remark
Nov 7, 8:14 PM CST	TSTM WND GST 72	Altus Air Force Base, OK
Nov 7, 8:15 PM CST	TSTM WND GST 62	3 N Altus, OK	ALTUS/QUARTZ MOUNTAIN AIRPORT

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.

Issued	Product	Office	Lasted
Nov 7, 1:11 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 1.4 hours before the alert went out and 179 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: 1647 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 574 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 325 m²/s²
Significant tornado parameter: 3.0
Supercell composite: 12.9

Open this sounding in Storm Lab

The text

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

408 
WUUS54 KOUN 080125
SVROUN
OKC031-055-065-075-141-149-080215-
/O.NEW.KOUN.SV.W.0621.111108T0125Z-111108T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
725 PM CST MON NOV 7 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN COMANCHE COUNTY IN SOUTHWEST OKLAHOMA...
  SOUTHEASTERN GREER COUNTY IN SOUTHWEST OKLAHOMA...
  JACKSON COUNTY IN SOUTHWEST OKLAHOMA...
  KIOWA COUNTY IN SOUTHWEST OKLAHOMA...
  NORTHWESTERN TILLMAN COUNTY IN SOUTHWEST OKLAHOMA...
  SOUTHEASTERN WASHITA COUNTY IN WESTERN OKLAHOMA...

* UNTIL 815 PM CST

* AT 724 PM CST...NATIONAL WEATHER SERVICE RADAR INDICATED SEVERE   
THUNDERSTORMS FROM 8 MILES SOUTHWEST OF OLUSTEE TO 5 MILES NORTHEAST 
OF BLAIR...MOVING NORTHEAST AT 30 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF GOLF BALLS...
WIND GUSTS TO 65 MPH...

* LOCATIONS IN THE WARNING INCLUDE ALTUS AIR FORCE BASE...ALTUS...
  BLAIR...COOPERTON...ELDORADO...ELMER...FRIENDSHIP...GOTEBO...
  HEADRICK...HESS...HOBART...HUMPHREYS...MARTHA...MOUNTAIN PARK...
  MOUNTAIN VIEW...NORTHWESTERN WICHITA MOUNTAINS WILDLIFE REFUGE...
  OLUSTEE...ROOSEVELT...SNYDER...TIPTON...TOM STEED RESERVOIR AND
  WARREN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3517 9899 3515 9862 3492 9861 3441 9924
      3444 9936 3446 9936 3445 9942 3439 9946
      3442 9952 3441 9959 3445 9974
TIME...MOT...LOC 0124Z 219DEG 27KT 3447 9950

$$

1 follow-up statement

141 
WWUS54 KOUN 080205
SVSOUN

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
805 PM CST MON NOV 7 2011

OKC055-141-080216-
/O.CAN.KOUN.SV.W.0621.000000T0000Z-111108T0215Z/
GREER OK-TILLMAN OK-
805 PM CST MON NOV 7 2011

...THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED FOR
NORTHWESTERN TILLMAN AND SOUTHEASTERN GREER COUNTIES...

LAT...LON 3468 9931 3475 9924 3517 9899 3515 9862
      3492 9862 3462 9898 3464 9903 3463 9917
TIME...MOT...LOC 0206Z 219DEG 27KT 3490 9886

$$

OKC031-065-075-149-080215-
/O.CON.KOUN.SV.W.0621.000000T0000Z-111108T0215Z/
COMANCHE OK-JACKSON OK-KIOWA OK-WASHITA OK-
805 PM CST MON NOV 7 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CST
FOR SOUTHEASTERN WASHITA...KIOWA...NORTHEASTERN JACKSON AND
NORTHWESTERN COMANCHE COUNTIES...

AT 806 PM CST...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE
THUNDERSTORM NEAR COOPERTON...MOVING NORTHEAST AT 30 MPH.

HAZARDS IN THE WARNING INCLUDE...
HAIL UP TO THE SIZE OF QUARTERS...
WIND GUSTS TO 60 MPH...

* LOCATIONS IN THE WARNING INCLUDE COOPERTON...FRIENDSHIP...GOTEBO...
  MOUNTAIN PARK...MOUNTAIN VIEW...NORTHWESTERN WICHITA MOUNTAINS
  WILDLIFE REFUGE...ROOSEVELT...SNYDER...TOM STEED RESERVOIR AND
  WARREN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH NO ADVANCE WARNING.
MOVE IMMEDIATELY TO A STORM SHELTER... BASEMENT OR STURDY BUILDING IF
A TORNADO IS SIGHTED.

&&

LAT...LON 3468 9931 3475 9924 3517 9899 3515 9862
      3492 9862 3462 9898 3464 9903 3463 9917
TIME...MOT...LOC 0206Z 219DEG 27KT 3490 9886

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 7, 6:12 PM CST	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Custer, Kingfisher, Kiowa and 1 more	63 min
Nov 7, 6:15 PM CST	Severe Thunderstorm Warning	OUN	Greer, Jackson	45 min
Nov 7, 6:30 PM CST	Areal Flood Advisory	OUN	Beckham, Blaine, Caddo, Canadian, Custer, Greer and 3 more	3 hr
Nov 7, 6:32 PM CST	Areal Flood Advisory	OUN	Beckham, Blaine, Caddo, Canadian, Custer, Greer and 3 more	3 hr
Nov 7, 6:41 PM CST	Severe Thunderstorm Warning	OUN	Harmon, Jackson	49 min
Nov 7, 6:58 PM CST	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	47 min
Nov 7, 7:00 PM CST	Flash Flood Watch	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Carter and 31 more	15 hr
Nov 7, 8:16 PM CST	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	44 min
Nov 7, 8:22 PM CST	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Kiowa	53 min
Nov 7, 8:26 PM CST	Severe Thunderstorm Warning	OUN	Tillman	64 min
Nov 7, 8:44 PM CST	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	46 min
Nov 7, 9:13 PM CST	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady	47 min
Nov 7, 9:21 PM CST	Special Weather Statement	OUN	Lincoln, Oklahoma, Payne	9 min
Nov 7, 9:31 PM CST	Special Weather Statement	OUN	Tillman	29 min
Nov 7, 10:08 PM CST	Special Weather Statement	OUN	Grady	37 min
Nov 7, 10:10 PM CST	Flash Flood Warning	OUN	Caddo, Canadian, Cleveland, Grady, Lincoln, Logan and 4 more	3 hr
Nov 7, 10:47 PM CST	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, Oklahoma	45 min
Nov 7, 10:59 PM CST	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Oklahoma, Pottawatomie	61 min
Nov 7, 11:03 PM CST	Special Weather Statement	OUN	Stephens	42 min
Nov 7, 11:14 PM CST	Special Weather Statement	OUN	Jackson	31 min
Nov 7, 11:20 PM CST	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole	55 min
Nov 7, 11:29 PM CST	Special Weather Statement	OUN	Stephens	46 min
Nov 7, 11:54 PM CST	Special Weather Statement	OUN	Garvin, McClain	36 min
Nov 8, 12:19 AM CST	Special Weather Statement	OUN	Okfuskee	26 min
Nov 8, 12:30 AM CST	Special Weather Statement	OUN	Jackson	30 min
Nov 8, 1:16 AM CST	Special Weather Statement	OUN	Stephens	14 min
Nov 8, 1:25 AM CST	Special Weather Statement	OUN	Jackson	35 min
Nov 8, 1:55 AM CST	Special Weather Statement	OUN	Garvin	35 min
Nov 8, 5:33 AM CST	Special Weather Statement	OUN	Jefferson	27 min
Nov 8, 6:29 AM CST	Special Weather Statement	OUN	Love	46 min
Nov 8, 7:00 AM CST	Special Weather Statement	OUN	Carter, Johnston, Marshall	45 min
Nov 8, 7:38 AM CST	Special Weather Statement	OUN	Atoka, Bryan, Coal, Johnston, Marshall, Pontotoc	37 min
Nov 8, 7:48 AM CST	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal, Hughes, Johnston, Marshall and 1 more	87 min
Nov 8, 9:19 AM CST	Special Weather Statement	OUN	Atoka, Bryan	26 min
Nov 8, 9:35 AM CST	Special Weather Statement	OUN	Atoka	10 min
Nov 8, 3:12 PM CST	River Flood Warning	OUN	Logan	16 hr
Nov 8, 3:12 PM CST	River Flood Warning	OUN	Logan	18 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.