Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 807, NWS Norman, OK

August 14, 20084 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 14, 2008, 10:02 PM CDT for 4 counties in Oklahoma. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 14, 2008, 10:02 PM CDT (03:02 UTC)
Expired
Aug 14, 2008, 10:33 PM CDT
In force
31 min
Issued by
NWS Norman, OK
Area
Storm-based polygon

Counties Carter County, OK, Jefferson County, OK, Love County, OK, Murray County, OK

The radar

The Norman radar (KTLX), 126 km from the middle of the area, began a volume at 03:03 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

Norman, OK (KOUN), launched 00:00Z, 3.0 hours before the alert went out and 114 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-pSkew-T log-p diagram, Norman, OK at 00:00Z on 2008-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1268 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 00:00Z on 2008-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 57 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1268 J/kg
Mixed-layer CIN
-27 J/kg
Mixed-layer LCL
1836 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
57 m²/s²
0-3 km storm-relative helicity
93 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 14, 9:36 PM CDT, 26 minutes earlier.

Area forecast discussion, Aug 14, 9:36 PM CDT, 26 minutes before
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Hazardous weather outlook, Aug 14, 6:10 PM CDT, 3 hours 52 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE NORMAN OK
610 PM CDT THU AUG 14 2008

OKZ004>048-050>052-TXZ083>090-151200-
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-
610 PM CDT THU AUG 14 2008

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

.DAY ONE...TONIGHT...

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

LOCATION...
THE SLIGHT RISK AREA IS NORTHWEST OF A LINE FROM PONCA CITY...TO
NORMAN...TO FREDERICK...TO CROWELL TEXAS.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE THROUGH
MIDNIGHT...ALTHOUGH STRONG THUNDERSTORMS WILL BE POSSIBLE OVERNIGHT.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD BE PREPARED FOR SEVERE WEATHER OPERATIONS THROUGH
MIDNIGHT.

DISCUSSION...
A SLOW MOVING UPPER-LEVEL STORM SYSTEM OVER THE NORTHERN ROCKIES
WILL MOVE SOUTH THROUGH TONIGHT. AS THE STORM APPROACHES...WINDS
ALOFT WILL INCREASE...WHICH WILL PROVIDE A FAVORABLE STEERING FLOW
FOR HIGH PLAINS THUNDERSTORM CLUSTERS TO AFFECT THE REGION.

AHEAD OF THE MAIN STORM SYSTEM...A SMALLER DISTURBANCE IS EXPECTED
TO MOVE EASTWARD OUT OF THE CENTRAL ROCKIES THIS EVENING...RESULTING
IN STRONG AND SEVERE THUNDERSTORMS IN THE SLIGHT RISK AREA...AND
LOCATIONS TO THE NORTH AND WEST OF OKLAHOMA. THE STRENGTHENING WINDS
ALOFT WILL PROVIDE SUFFICIENT VERTICAL WIND SHEAR FOR ORGANIZED
SEVERE THUNDERSTORMS...PRIMARILY OVER THE WESTERN HALF OF OKLAHOMA
AND PORTIONS OF WESTERN NORTH TEXAS. DAMAGING WINDS WILL BE THE MAIN
CONCERN...BUT LARGE HAIL AND LOCALLY HEAVY RAIN ALSO WILL BE
CONCERNS.

THUNDERSTORM CLUSTERS THAT DEVELOP CLOSER TO THE MAIN UPPER STORM
SYSTEM COULD APPROACH NORTHERN PORTIONS OF OKLAHOMA TOWARD DAYBREAK
FRIDAY...BUT SHOULD NOT BE AS STRONG AS THOSE EXPECTED THIS EVENING.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY AUG 15.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...60  PERCENT.

OTHER HAZARDOUS WEATHER...
NONE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORM CHANCES WILL REMAIN HIGH FROM FRIDAY THROUGH THE
WEEKEND... AND WILL CONTINUE INTO EARLY NEXT WEEK. THE STRONG STORM
SYSTEM MENTIONED EARLIER WILL CONTINUE TO MOVE SOUTH INTO THE
CENTRAL OR SOUTHERN PLAINS... AND WILL LIKELY LINGER IN THE AREA FOR
SEVERAL DAYS. SOME SEVERE WEATHER WILL BE POSSIBLE... BUT HEAVY RAIN
AND FLOODING WILL BE A GREATER CONCERN ACROSS MUCH OF OKLAHOMA AND
WESTERN NORTH TEXAS.

OTHER HAZARDOUS WEATHER...
THOSE WHO LIVE IN AND NEAR FLOOD-PRONE AREAS SHOULD REVIEW
PREPAREDNESS PLANS IN PREPARATION FOR THE POSSIBILITY OF MULTIPLE
ROUNDS OF HEAVY RAIN...AND SHOULD BE READY TO TAKE ACTION.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT 7 AM
FRIDAY.

CMS/11

In the hours before

Local storm report, Aug 14, 9:02 PM CDT, 1 hour before
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Local storm report, Aug 14, 9:08 PM CDT, 54 minutes before
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Local storm report, Aug 14, 9:35 PM CDT, 27 minutes before
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Local storm report, Aug 14, 9:41 PM CDT, 21 minutes before
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Special weather statement, Aug 14, 9:44 PM CDT, 18 minutes before
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Special weather statement, Aug 14, 9:46 PM CDT, 16 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 7:21 PM CDTSevere Thunderstorm WarningOUNBeckham, Roger Mills39 min
Aug 14, 7:25 PM CDTSevere Thunderstorm WarningOUNGrady, McClain50 min
Aug 14, 7:33 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche42 min
Aug 14, 7:38 PM CDTSevere Thunderstorm WarningOUNLincoln, Logan, Payne52 min
Aug 14, 7:55 PM CDTSevere Thunderstorm WarningOUNGarvin, Grady, McClain, Stephens50 min
Aug 14, 7:59 PM CDTSevere Thunderstorm WarningOUNBeckham, Roger Mills, Washita46 min
Aug 14, 8:10 PM CDTSevere Thunderstorm WarningOUNCaddo, Comanche, Grady, Stephens35 min
Aug 14, 8:28 PM CDTSevere Thunderstorm WarningOUNCaddo, Canadian, Cleveland, Grady, Lincoln, McClain and 1 more47 min
Aug 14, 8:30 PM CDTSevere Thunderstorm WarningOUNLincoln45 min
Aug 14, 8:36 PM CDTSevere Thunderstorm WarningOUNGreer, Harmon, Jackson, Kiowa, Washita39 min
Aug 14, 8:46 PM CDTSevere Thunderstorm WarningOUNCarter, Comanche, Cotton, Garvin, Grady, Jefferson and 1 more44 min
Aug 14, 9:02 PM CDTSevere Thunderstorm WarningOUNCleveland, Lincoln, Oklahoma, Pottawatomie, Seminole43 min
Aug 14, 9:09 PM CDTSevere Thunderstorm WarningOUNCarter, Garvin, Jefferson, Love, Marshall, Murray and 1 more51 min
Aug 14, 9:14 PM CDTSevere Thunderstorm WarningOUNComanche, Harmon, Jackson, Kiowa, Tillman46 min
Aug 14, 9:39 PM CDTAreal Flood AdvisoryOUNCleveland, McClain, Oklahoma111 min
Aug 14, 9:59 PM CDTSevere Thunderstorm WarningOUNJackson, Tillman46 min
Aug 14, 10:32 PM CDTAreal Flood AdvisoryOUNCarter, Comanche, Cotton, Jefferson, Stephens3 hr
Aug 15, 12:24 AM CDTAreal Flood AdvisoryOUNAtoka, Coal3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2008Every severe thunderstorm warning in 2008

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.