Alert archive / Texas / Special Weather Statements in 2011

Special Weather Statement, NWS Norman, OK

November 8, 2011Knox County, Texas

NWS Norman, OK issued this special weather statement at Nov 8, 2011, 2:53 AM CST for Knox County, Texas. It was in force for 22 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: Nov 8, 2011, 2:53 AM CST (08:53 UTC)
Expired: Nov 8, 2011, 3:15 AM CST
In force: 22 min
Issued by: NWS Norman, OK

County Knox County, TX

The radar

The Altus AFB radar (KFDR), 123 km from the middle of the area, began a volume at 08:55 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

Fort Worth, TX (KFWD), launched 00:00Z, 8.9 hours before the alert went out and 252 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: 1725 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 615 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 303 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 10.8

Open this sounding in Storm Lab

The text

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

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this special weather statement went out at Nov 8, 1:26 AM CST, 1 hour 27 minutes earlier.

Area forecast discussion, Nov 8, 1:26 AM CST, 1 hour 27 minutes before

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Hazardous weather outlook, Nov 7, 9:50 PM CST, 5 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
950 PM CST MON NOV 7 2011

OKZ004>048-050>052-TXZ083>090-081100-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
950 PM CST MON NOV 7 2011

THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVERNIGHT ACROSS MUCH
OF OKLAHOMA AND ALL OF WESTERN NORTH TEXAS.

LOCATION...
THE SLIGHT RISK AREA IS EAST OF A LINE FROM HOLLIS...TO WATONGA...TO
BLACKWELL...AND WEST OF A LINE FROM MARIETTA TO HOLDENVILLE.

TIMING...
SEVERE STORMS WILL BE MOST LIKELY FROM NOW THROUGH 4 AM.

IMPACTS...
DAMAGE TO VEHICLES AND BUILDINGS FROM HAIL...STRONG WINDS...AND
POSSIBLY TORNADOES.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS THROUGH ABOUT 4
AM.

DISCUSSION...
A VERY HUMID AIRMASS IS EXPECTED TO MAINTAIN ITSELF ACROSS ALL BUT
NORTHWEST OKLAHOMA. AN UPPER LEVEL TROUGH ARRIVING FROM THE WEST
WILL PROVIDE INCREASED ENERGY TO ALLOW STRONG AND SEVERE
THUNDERSTORMS TONIGHT. THE WIND PROFILE WILL BE FAVORABLE FOR
SUPERCELL THUNDERSTORMS. THERE IS A RISK OF TORNADOES WITH SOME OF
THE THUNDERSTORMS. MOST OF THE STORMS WILL MOVE TOWARD THE
NORTHEAST. BOW ECHOES WILL FORM OCCASIONALLY OVERNIGHT...WITH THE
ASSOCIATED RISK OF DAMAGING WINDS.

HEAVY RAIN WILL ALSO BE LIKELY...AND FLASH FLOODING IS
POSSIBLE...MAINLY ALONG A LINE FROM FAR SOUTHWEST OKLAHOMA TO
NORTH-CENTRAL OKLAHOMA.

PROBABILITY TABLE...
VALID THROUGH 700 AM CST TUESDAY NOV 8.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.

OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL THIS EVENING AND OVERNIGHT MAY PRODUCE SOME FLOODING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

THUNDERSTORM OUTLOOK...
THE CHANCE OF STRONG THUNDERSTORMS WILL LINGER INTO TUESDAY MORNING
OVER SOUTHEAST OKLAHOMA. DRY WEATHER IS THEN FORECAST FOR SEVERAL
DAYS UNTIL A CHANCE OF THUNDERSTORMS RETURNS ON SUNDAY.

OTHER HAZARDOUS WEATHER...
LIMITED FROST AND FREEZING TEMPERATURES MAY OCCUR THURSDAY AND
FRIDAY MORNINGS.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 5 AM
TUESDAY.

CMS

In the hours before

Special weather statement, Nov 8, 12:19 AM CST, 2 hours 34 minutes before

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Special weather statement, Nov 8, 12:30 AM CST, 2 hours 23 minutes before

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Special weather statement, Nov 8, 1:16 AM CST, 1 hour 37 minutes before

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Special weather statement, Nov 8, 1:25 AM CST, 1 hour 28 minutes before

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Special weather statement, Nov 8, 1:55 AM CST, 58 minutes before

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Special weather statement, Nov 8, 2:53 AM CST, 0 minutes before

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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, 7:25 PM CST	Severe Thunderstorm Warning	OUN	Comanche, Greer, Jackson, Kiowa, Tillman, Washita	50 min
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
Nov 7, 6:35 PM CST	Severe Thunderstorm Warning	OUN	Foard, Hardeman	55 min
Nov 8, 3:29 AM CST	Special Weather Statement	OUN	Baylor	46 min
Nov 8, 3:51 AM CST	Severe Thunderstorm Warning	OUN	Archer, Baylor	69 min
Nov 8, 4:33 AM CST	Special Weather Statement	OUN	Clay, Wichita	42 min
Nov 8, 4:46 AM CST	Severe Thunderstorm Warning	OUN	Clay	44 min

Nearby

Special Weather Statements in Texas, 2011 Every special weather statement 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.