Alert archive / Oklahoma / Flash Flood Warnings in 2010

Flash Flood Warning 23, NWS Norman, OK

July 7, 2010Caddo County, Canadian County, Oklahoma

NWS Norman, OK issued this flash flood warning at Jul 7, 2010, 2:30 PM CDT for Caddo County, Canadian 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
Jul 7, 2010, 2:30 PM CDT (19:30 UTC)
Expired
Jul 7, 2010, 6:30 PM CDT
In force
4 hr
Issued by
NWS Norman, OK
Area
Storm-based polygon
Flood severity
None

Counties Caddo County, OK, Canadian County, OK

The radar

The Norman radar (KTLX), 82 km from the middle of the area, began a volume at 19:33 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, 7.5 hours before the alert went out and 72 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 12:00Z on 2010-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 387 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 12:00Z on 2010-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 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
387 J/kg
Mixed-layer CIN
-73 J/kg
Mixed-layer LCL
752 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
33 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash 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 flash flood warning went out at Jul 7, 1:06 PM CDT, 1 hour 24 minutes earlier.

Area forecast discussion, Jul 7, 1:06 PM CDT, 1 hour 24 minutes before
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Hazardous weather outlook, Jul 7, 11:50 AM CDT, 2 hours 40 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1150 AM CDT WED JUL 7 2010

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-
1150 AM CDT WED JUL 7 2010

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

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

THUNDERSTORM OUTLOOK...
SEVERE THUNDERSTORMS ARE NOT EXPECTED.

DISCUSSION...
A DEEP LAYER OF VERY MOIST AIR WILL PERSIST OVER THE SOUTHERN
PLAINS... RESULTING IN A CONTINUATION OF SHOWERS AND THUNDERSTORMS.
THE VERTICAL WIND SHEAR WILL REMAIN RELATIVELY WEAK ACROSS THE AREA
THROUGH TONIGHT. HOWEVER... DAYTIME HEATING COULD RESULT IN
SUFFICIENT INSTABILITIES TO SUPPORT A FEW THUNDERSTORMS PRODUCING
BRIEF STRONG WINDS TO NEAR 50 MPH THIS AFTERNOON AND EARLY EVENING.
THE PRIMARY CONCERNS CONTINUE TO BE HEAVY RAINFALL.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT THURSDAY JUL 8.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...10 PERCENT.

OTHER HAZARDOUS WEATHER...
THE PERSISTENT...GREAT AMOUNT OF MOISTURE IN THE ATMOSPHERE...AND
THE SLOW MOVEMENT OF THUNDERSTORMS... WILL AGAIN SUPPORT LOCALLY
HEAVY RAINFALL. MEANWHILE...AN UPPER DISTURBANCE OVER SOUTHEAST
OKLAHOMA WILL CONTINUE TO DRIFT NORTH AND NORTHWEST TODAY BRINGING A
CHANCE OF HEAVY RAIN TO PARTS OF SOUTHEAST OKLAHOMA. FINALLY...
ADDITIONAL SHOWER AND THUNDERSTORM DEVELOPMENT WILL LIKELY OCCUR
THIS AFTERNOON AND EVENING NEAR WEAK BOUNDARIES GENERATED FROM
EARLIER THUNDERSTORM ACTIVITY. SEE THE FLASH FLOOD WATCH PRODUCT FOR
FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

THUNDERSTORM OUTLOOK...
WHILE THE SEVERE WEATHER POTENTIAL WILL REMAIN MINIMAL... THE
POTENTIAL FOR HEAVY RAIN AND FLOODING WILL CONTINUE INTO FRIDAY AS
DEEP TROPICAL MOISTURE CONTINUES TO FLOW INTO THE SOUTHERN PLAINS.
THE FLOODING THREAT MAY BECOME PARTICULARLY WIDESPREAD ON THURSDAY
NIGHT AND EARLY FRIDAY...AS A COLD FRONT CONVERGES WITH EVEN DEEPER
TROPICAL MOISTURE MOVING UP FROM THE GULF COAST.

ALTHOUGH PRECIPITATION CHANCES WILL DECREASE SOMEWHAT BY FRIDAY
NIGHT...THE MOISTURE CONTENT IN THE ATMOSPHERE IS NOT EXPECTED TO
DECREASE IN ANY SUBSTANTIAL WAY. THUS...THERE WILL BE A RISK OF
FLOODING WHEREVER STORMS CAN DEVELOP...EVEN GOING INTO THE UPCOMING
WEEKEND.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM
THURSDAY MORNING.

CJS/30

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 7:38 PM CDTAreal Flood AdvisoryOUNCaddo, Kiowa, Washita3 hr
Jul 6, 8:19 PM CDTRiver Flood WarningOUNCotton, Jefferson, Tillman42 hr
Jul 6, 11:20 PM CDTAreal Flood AdvisoryOUNBeckham, Roger Mills3 hr
Jul 7, 12:10 AM CDTFlash Flood WarningOUNBeckham3 hr
Jul 7, 2:59 AM CDTFlash Flood WarningOUNBeckham, Custer, Roger Mills, Washita3 hr
Jul 7, 4:12 AM CDTFlash Flood WatchOUNAlfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 41 more72 hr
Jul 7, 5:31 AM CDTAreal Flood AdvisoryOUNBeckham, Roger Mills3 hr
Jul 7, 7:10 AM CDTAreal Flood AdvisoryOUNKiowa, Washita3 hr
Jul 7, 10:42 AM CDTRiver Flood WarningOUNLincoln, Oklahoma, Pottawatomie3 hr
Jul 7, 1:36 PM CDTAreal Flood AdvisoryOUNAtoka3 hr
Jul 7, 1:50 PM CDTAreal Flood AdvisoryOUNCaddo, Kiowa3 hr
Jul 7, 1:50 PM CDTRiver Flood WarningOUNCotton13 hr
Jul 7, 2:17 PM CDTFlash Flood WarningOUNCaddo, Comanche, Kiowa4 hr
Jul 7, 4:06 PM CDTAreal Flood AdvisoryOUNGarfield3 hr
Jul 7, 4:32 PM CDTAreal Flood AdvisoryOUNTillman3 hr
Jul 7, 5:29 PM CDTAreal Flood AdvisoryOUNKay3 hr

Nearby

Flash Flood Warnings in Oklahoma, 2010Every flash flood warning in 2010

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.