Alert archive / Oklahoma / Special Weather Statements in 2011

Special Weather Statement, NWS Norman, OK

August 7, 2011Harper County, Oklahoma

NWS Norman, OK issued this special weather statement at Aug 7, 2011, 8:13 PM CDT for Harper County, Oklahoma. It was in force for 32 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 7, 2011, 8:13 PM CDT (01:13 UTC)
Expired: Aug 7, 2011, 8:45 PM CDT
In force: 32 min
Issued by: NWS Norman, OK

County Harper County, OK

The radar

The Dodge City radar (KDDC), 120 km from the middle of the area, began a volume at 01:13 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

Dodge City, (KDDC), launched 00:00Z, 1.2 hours before the alert went out and 119 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: 1380 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 2833 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 7.8

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 Aug 7, 6:40 PM CDT, 1 hour 33 minutes earlier.

Area forecast discussion, Aug 7, 6:40 PM CDT, 1 hour 33 minutes before

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Hazardous weather outlook, Aug 7, 3:40 PM CDT, 4 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
340 PM CDT SUN AUG 7 2011

OKZ004>048-050>052-TXZ083>090-081000-
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-
340 PM CDT SUN AUG 7 2011

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

.DAY ONE...THROUGH TONIGHT...

THUNDERSTORM OUTLOOK...
SCATTERED THUNDERSTORMS WILL BE SEEN...PRIMARILY ACROSS AN AREA
EXTENDING FROM NORTHWEST OKLAHOMA...SOUTHEAST THROUGH CENTRAL INTO
SOUTHEAST PARTS OF THE SOONER STATE. ALTHOUGH ORGANIZED OR SUSTAINED
SEVERE WEATHER IS NOT EXPECTED...AN ISOLATED DAMAGING WIND GUST WILL
BE POSSIBLE.

DISCUSSION...
THUNDERSTORMS WILL DEVELOP ACROSS NORTHWEST OKLAHOMA AND BUILD
EASTWARD THROUGH THIS EVENING. ADDITIONAL STORMS MAY DEVELOP ON THE
EDGE OF CENTRAL OKLAHOMA CLOUD COVER...SOUTH AND EAST OF OKLAHOMA
CITY DOWN TOWARD ADA AND ATOKA. MOST STORMS WILL PRODUCE STRONG WIND
GUSTS...ON THE ORDER OF 40 TO 50 MPH...AND SHOULD BE TAKEN
SERIOUSLY. DAMAGING WIND GUSTS CANNOT BE RULED OUT SINCE MANY
LOCATIONS WILL BE IN AN ENVIRONMENT CHARACTERIZED BY HOT AND DRY AIR
BELOW CLOUD BASES.

THUNDERSTORMS ACROSS KANSAS MAY SEND AN OUTFLOW BOUNDARY INTO
NORTHERN OKLAHOMA THIS EVENING AND OVERNIGHT. THUNDERSTORMS COULD
DEVELOP IN ASSOCIATION WITH THIS BOUNDARY...ALTHOUGH SEVERE STORMS
WOULD BE UNLIKELY.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT MONDAY AUG 8.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...30 PERCENT.

OTHER HAZARDOUS WEATHER...
DANGEROUS HEAT WILL PERSIST ACROSS MOST THE REGION.

HOT AND DRY CONDITIONS...ALONG WITH DRY VEGETATION... WILL KEEP
WILDFIRE POTENTIAL HIGH. THUNDERSTORMS THAT OCCUR WILL BE CAPABLE OF
IGNITING ADDITIONAL WILDFIRES.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THUNDERSTORM OUTLOOK...
AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE ON MONDAY ALONG
AND AHEAD OF A COLD FRONT MOVING INTO NORTHWEST OKLAHOMA.
THUNDERSTORM COMPLEXES FORMING ON THE HIGH PLAINS MAY MOVE OVER
PORTIONS OF THE AREA FROM TUESDAY THROUGH SATURDAY... MAINLY DURING
THE OVERNIGHT AND EARLY MORNING HOURS.

OTHER HAZARDOUS WEATHER...
THE EXCESSIVE HEAT WARNING CONTINUES THROUGH AT LEAST MONDAY AS VERY
HOT WEATHER WILL PERSIST. MODERATE SOUTH TO SOUTHWEST WINDS MAY
DEVELOP ON MONDAY. THESE MODERATE WINDS.. ALONG WITH HOT WEATHER AND
DRY VEGETATION... WILL ELEVATE WILDFIRE CONCERNS ON MONDAY.

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

In the hours before

Special weather statement, Aug 7, 5:33 PM CDT, 2 hours 40 minutes before

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Special weather statement, Aug 7, 5:50 PM CDT, 2 hours 23 minutes before

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Special weather statement, Aug 7, 7:42 PM CDT, 31 minutes before

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Special weather statement, Aug 7, 7:47 PM CDT, 26 minutes before

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Special weather statement, Aug 7, 8:11 PM CDT, 2 minutes before

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Special weather statement, Aug 7, 8:13 PM CDT, 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
Aug 7, 7:42 PM CDT	Special Weather Statement	OUN	Beckham, Custer, Dewey, Roger Mills	33 min
Aug 7, 7:47 PM CDT	Special Weather Statement	OUN	Harper	28 min
Aug 7, 8:11 PM CDT	Special Weather Statement	OUN	Custer, Dewey	34 min
Aug 8, 4:43 AM CDT	Red Flag Warning	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 27 more	16 hr
Aug 8, 3:59 PM CDT	Special Weather Statement	OUN	Roger Mills	31 min
Aug 8, 4:27 PM CDT	Special Weather Statement	OUN	Roger Mills	18 min
Aug 8, 4:40 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Dewey, Roger Mills	50 min
Aug 8, 4:54 PM CDT	Special Weather Statement	OUN	Major	36 min
Aug 8, 5:04 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	56 min
Aug 8, 5:11 PM CDT	Special Weather Statement	OUN	Grant	34 min
Aug 8, 5:33 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Blaine, Garfield, Grant, Kingfisher, Major	57 min
Aug 8, 5:36 PM CDT	Special Weather Statement	OUN	Beckham, Custer	39 min
Aug 8, 5:41 PM CDT	Special Weather Statement	OUN	Kay	49 min
Aug 8, 5:47 PM CDT	Severe Thunderstorm Warning	OUN	Kay, Noble	58 min
Aug 8, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Garfield, Kingfisher, Logan, Noble, Payne	76 min
Aug 8, 6:19 PM CDT	Special Weather Statement	OUN	Beckham, Custer, Greer, Washita	26 min
Aug 8, 6:46 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	59 min
Aug 8, 6:52 PM CDT	Special Weather Statement	OUN	Greer, Washita	23 min

Nearby

Special Weather Statements in Oklahoma, 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.