Alert archive / Oklahoma / Areal Flood Warnings in 2009

Areal Flood Warning 21, NWS Norman, OK

October 8, 2009Blaine County, Garfield County, Major County, Oklahoma

NWS Norman, OK issued this areal flood warning at Oct 8, 2009, 2:26 PM CDT for Blaine County, Garfield County, Major County, Oklahoma. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Oct 8, 2009, 2:26 PM CDT (19:26 UTC)
Expired: Oct 8, 2009, 6:30 PM CDT
In force: 4 hr
Issued by: NWS Norman, OK
Area: Storm-based polygon
Flood severity: None

Counties Blaine County, OK, Garfield County, OK, Major County, OK

The radar

The Vance AFB radar (KVNX), 62 km from the middle of the area, began a volume at 19:27 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.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 7.4 hours before the alert went out and 132 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: 245 J/kg
Mixed-layer CIN: -315 J/kg
Mixed-layer LCL: 421 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 335 m²/s²
0-3 km storm-relative helicity: 349 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood warning went out at Oct 8, 6:43 AM CDT, 7 hours 43 minutes earlier.

Area forecast discussion, Oct 8, 6:43 AM CDT, 7 hours 43 minutes before

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Hazardous weather outlook, Oct 8, 11:57 AM CDT, 2 hours 29 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1157 AM CDT THU OCT 8 2009

OKZ004>048-050>052-TXZ083>090-091000-
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-
1157 AM CDT THU OCT 8 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THROUGH TONIGHT
ACROSS PORTIONS OF OKLAHOMA AND WESTERN NORTH TEXAS.

LOCATION...
IN WESTERN NORTH TEXAS...THE SLIGHT RISK COVERS THE AREA EAST OF A
LINE FROM KNOX CITY TO VERNON. IN OKLAHOMA...THE SLIGHT RISK COVERS
THE AREA EAST OF A LINE FROM ALTUS TO WATONGA...AND SOUTH OF A LINE
FROM WATONGA TO PERRY. WITHIN THIS AREA...THE RISK WILL BE GREATEST
TO THE SOUTHEAST OF A LINE FROM ARCHER CITY TEXAS TO DUNCAN...
PURCELL...AND SHAWNEE OKLAHOMA.

TIMING...
THE MOST LIKELY TIME FOR SEVERE THUNDERSTORMS WILL BE FROM 3 PM
THROUGH 1 AM.

IMPACTS...
DAMAGING WIND GUSTS OF 60 TO 70 MPH.

SOME DAMAGE TO AUTOMOBILES AND TENDER VEGETATION FROM LARGE HAIL.
MUCH OF THE HAIL WILL BE AROUND ONE INCH IN DIAMETER...BUT
SUPERCELLS MAY PRODUCE HAIL UP TO TWO INCHES IN DIAMETER IN THE AREA
OF GREATEST RISK.

TORNADOES ARE POSSIBLE...ESPECIALLY IN THE AREA OF GREATEST RISK
OVER SOUTHERN OKLAHOMA AND PART OF WESTERN NORTH TEXAS.

RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE
RISK AREA SHOULD PLAN FOR SEVERE WEATHER OPERATIONS FROM 3 PM UNTIL
MIDNIGHT.

DISCUSSION...
A VARIETY OF SEVERE WEATHER THREATS WILL UNFOLD TODAY...AS A COLD
FRONT AND STRONG UPPER LEVEL WINDS ENCOUNTER TROPICAL MOISTURE
MOVING UP INTO OKLAHOMA AND NORTH TEXAS. THUNDERSTORMS WILL BE
CONCENTRATED OVER NORTHERN AND WESTERN OKLAHOMA EARLY IN THE
AFTERNOON. INSTABILITY WILL BE SUFFICIENT FOR A THREAT OF LARGE HAIL
UP TO QUARTER SIZE. BY MID AFTERNOON...THE EMPHASIS WILL BEGIN TO
SHIFT SOUTHWARD ALONG THE ADVANCING COLD FRONT...AS IT MOVES INTO
SOUTHWEST AND CENTRAL OKLAHOMA...AND FAR WESTERN NORTH TEXAS.
THUNDERSTORMS WILL BECOME BASED CLOSER TO THE SURFACE...RELEASING
GREATER INSTABILITY...AND RESULTING IN AN INCREASED POTENTIAL FOR
SEVERE WEATHER. SEVERAL STORM MODES ARE EXPECTED...INCLUDING SOME
SUPERCELLS AND BOW ECHOES...CARRYING THREATS OF LARGE HAIL AND
DAMAGING WINDS. IN ADDITION...DEWPOINTS IN THE 60S AND LOW 70S WILL
KEEP CLOUD BASES NEAR THE GROUND...RESULTING IN A POSSIBILITY OF
TORNADOES.

FROM LATE AFTERNOON INTO THE EVENING...THE RISK OF PARTICULARLY
DAMAGING STRAIGHT LINE WINDS...AND A FEW TORNADOES...WILL INCREASE
OVER SOUTHERN OKLAHOMA AND ADJACENT PORTIONS OF WESTERN NORTH TEXAS.
THE GREATEST THREAT WILL OCCUR WITH ANY STORMS FORMING AHEAD OF THE
COLD FRONT. AT ANY GIVEN LOCATION...THE SEVERE WEATHER RISK WILL END
SHORTLY AFTER THE COLD FRONT PASSES. THE FRONT IS EXPECTED TO EXIT
SOUTHEAST OKLAHOMA BY 1 AM.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY OCT 9.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...80 PERCENT.

OTHER HAZARDOUS WEATHER...
HEAVY RAINFALL HAS LEFT THE GROUND SATURATED ACROSS PARTS OF THE
AREA. ANY ADDITIONAL HEAVY RAINFALL WILL RESULT IN RAPID RUNOFF AND
POSSIBLE FLASH FLOODING. A FLASH FLOOD WATCH IS IN EFFECT. PLEASE
REFER TO THE LATEST VERSION OF THIS PRODUCT FOR MORE INFORMATION.

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

THUNDERSTORM OUTLOOK...
THUNDERSTORMS WILL END ON FRIDAY OVER SOUTHEASTERN OKLAHOMA.
THUNDERSTORM CHANCES WILL RETURN TO NORTHERN OKLAHOMA SUNDAY NIGHT
AND WILL CONTINUE INTO MIDWEEK FOR MUCH OF THE AREA.

OTHER HAZARDOUS WEATHER...
UNSEASONABLY COLD AIR WILL MOVE INTO THE AREA OVER THE WEEKEND.
FROST OR LIGHT FREEZE CONDITIONS MAY OCCUR SUNDAY MORNING... MOST
LIKELY OVER NORTHERN OKLAHOMA.

BURKE/24

In the hours before

Local storm report, Oct 8, 9:17 AM CDT, 5 hours 9 minutes before

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Special weather statement, Oct 8, 9:47 AM CDT, 4 hours 39 minutes before

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Special weather statement, Oct 8, 10:03 AM CDT, 4 hours 23 minutes before

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Special weather statement, Oct 8, 10:39 AM CDT, 3 hours 47 minutes before

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Special weather statement, Oct 8, 12:38 PM CDT, 1 hour 48 minutes before

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Special weather statement, Oct 8, 12:49 PM CDT, 1 hour 37 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
Oct 8, 4:59 AM CDT	Severe Thunderstorm Warning	OUN	Dewey, Woodward	36 min
Oct 8, 12:21 PM CDT	Areal Flood Advisory	OUN	Alfalfa, Blaine, Dewey, Garfield, Grant, Kay and 2 more	4 hr
Oct 8, 3:52 PM CDT	Severe Thunderstorm Warning	OUN	Grady, Stephens	23 min
Oct 8, 4:13 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Stephens	47 min
Oct 8, 4:30 PM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Grady, Logan, McClain, Oklahoma	4 hr
Oct 8, 4:49 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie, Seminole	41 min
Oct 8, 5:24 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray, Stephens	25 min
Oct 8, 5:30 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	45 min
Oct 8, 3:43 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	62 min
Oct 8, 4:22 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman	38 min
Oct 8, 4:39 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Hardeman, Wilbarger	63 min
Oct 8, 6:19 PM CDT	Severe Thunderstorm Warning	OUN	Foard, Knox	56 min
Oct 8, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Baylor, Wilbarger	48 min

Nearby

Areal Flood Warnings in Oklahoma, 2009 Every areal flood warning in 2009

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.