Alert archive / Oklahoma / Flash Flood Warnings in 2010

Flash Flood Warning 17, NWS Norman, OK

July 5, 2010Caddo County, Canadian County, Grady County, Oklahoma

NWS Norman, OK issued this flash flood warning at Jul 5, 2010, 7:46 AM CDT for Caddo County, Canadian County, Grady County, Oklahoma. It was in force for 3 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 5, 2010, 7:46 AM CDT (12:46 UTC)
Expired
Jul 5, 2010, 10:45 AM CDT
In force
3 hr
Issued by
NWS Norman, OK
Area
Storm-based polygon
Flood severity
None

Counties Caddo County, OK, Canadian County, OK, Grady County, OK

The radar

The Norman radar (KTLX), 74 km from the middle of the area, began a volume at 12:49 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

Lamont, OK (KLMN), launched 12:00Z, 0.8 hours before the alert went out and 162 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, Lamont, OK at 12:00Z on 2010-07-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1008 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, Lamont, OK at 12:00Z on 2010-07-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 41 square meters per square second.193958Sfc1 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
1008 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
656 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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 5, 6:38 AM CDT, 1 hour 8 minutes earlier.

Area forecast discussion, Jul 5, 6:38 AM CDT, 1 hour 8 minutes before
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Hazardous weather outlook, Jul 5, 5:00 AM CDT, 2 hours 46 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
500 AM CDT MON JUL 5 2010

OKZ004>048-050>052-TXZ083>090-051700-
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-
500 AM CDT MON JUL 5 2010

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

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

THUNDERSTORM OUTLOOK...
ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE LATE THIS AFTERNOON AND
THIS EVENING OVER NORTHWESTERN OKLAHOMA... NORTHWEST OF A LINE FROM
ALVA TO VICI TO CHEYENNE.

DISCUSSION...
A STRONG UPPER-LEVEL TROUGH OVER COLORADO THIS MORNING WILL MOVE
EAST INTO THE CENTRAL PLAINS LATER TODAY AND THIS EVENING. DRIER AIR
ALOFT... TO THE SOUTH OF THIS TROUGH... WILL MOVE EAST WITH THE
SYSTEM INTO PARTS OF THE CENTRAL AND SOUTHERN PLAINS... AND WILL
DISPLACE THE PERSISTENT PLUME OF DEEP TROPICAL MOISTURE EASTWARD AND
AWAY FROM NORTHWESTERN OKLAHOMA. WITHIN THE AREA OF DRIER AIR
ALOFT... INSTABILITY WILL INCREASE DUE TO STEEPER LAPSE RATES ALOFT.
MEANWHILE A COLD FRONT WILL MOVE SOUTHEAST AND WILL BE LOCATED CLOSE
TO THE NORTHWESTERN CORNER OF OKLAHOMA LATE THIS AFTERNOON. LIFTING
AHEAD OF THE UPPER TROUGH MAY RESULT IN THUNDERSTORMS DEVELOPING
NEAR THE COLD FRONT LATE THIS AFTERNOON OR EARLY THIS EVENING.
GREATER INSTABILITY WILL LIKELY EXIST THAN HAS BEEN PRESENT IN
RECENT DAYS... BUT THE AMOUNT OF SURFACE-BASED INSTABILITY WILL
DEPEND ON WHETHER OR NOT LOW CLOUDS WILL BREAK UP THIS AFTERNOON
OVER NORTHWESTERN OKLAHOMA. IF THE CLOUDS BREAK AND THE LOW LEVELS
BECOME MORE UNSTABLE... THUNDERSTORMS WILL BECOME SURFACE BASED.
INCREASING SOUTHWEST WINDS ALOFT AHEAD OF THE UPPER TROUGH WILL LEAD
TO STRONGER VERTICAL WIND SHEAR... WHICH WOULD SUPPORT A FEW
ORGANIZED STRONG THUNDERSTORMS. LARGE HAIL AND DAMAGING THUNDERSTORM
WINDS WOULD BE THE MAIN CONCERN.

ELSEWHERE... INSTABILITY WILL REMAIN WEAK BUT DEEP ATMOSPHERIC
MOISTURE WILL SUPPORT WIDESPREAD SHOWERS AND AREAS OF RAIN... WITH
ISOLATED TO SCATTERED EMBEDDED THUNDERSTORMS THROUGH TONIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT TUESDAY JUL 6.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...80 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...20 PERCENT.

OTHER HAZARDOUS WEATHER...
A FLASH FLOOD WATCH REMAINS IN EFFECT FOR PARTS OF WESTERN OKLAHOMA
AND WESTERN NORTH TEXAS.  PLEASE REFER TO THE FLASH FLOOD WATCH FOR
DETAILS.

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

THUNDERSTORM OUTLOOK...
THE UPPER TROUGH OVER COLORADO THIS MORNING WILL MOVE EAST OF THE
AREA BY LATE TUESDAY... DISPLACING THE DEEP TROPICAL MOISTURE
FARTHER EAST AND AT LEAST REDUCING THE CHANCES OF THUNDERSTORMS AND
ADDITIONAL HEAVY RAIN. HOWEVER THE LOW LEVELS WILL REMAIN
SUFFICIENTLY MOIST AND UNSTABLE TO SUPPORT THE CHANCE OF AT LEAST
WIDELY SCATTERED THUNDERSTORMS INTO MIDWEEK. THUNDERSTORM CHANCES
MAY INCREASE AGAIN BY AROUND THURSDAY AS A WEAK COLD FRONT MOVES
INTO THE SOUTHERN PLAINS.

OTHER HAZARDOUS WEATHER...
NONE.

THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY NOON
TODAY.

In the hours before

Local storm report, Jul 5, 6:37 AM CDT, 1 hour 9 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 4, 8:02 PM CDTRiver Flood WarningOUNPottawatomie, Seminole14 hr
Jul 5, 3:43 AM CDTAreal Flood AdvisoryOUNCaddo, Comanche, Greer, Harmon, Jackson, Kiowa and 1 more4 hr
Jul 5, 4:36 AM CDTFlash Flood WarningOUNGreer, Jackson, Kiowa5 hr
Jul 5, 5:50 AM CDTAreal Flood AdvisoryOUNBlaine, Caddo, Canadian, Custer, Washita4 hr
Jul 5, 6:09 AM CDTFlash Flood WarningOUNCaddo, Kiowa, Washita4 hr
Jul 5, 7:28 AM CDTAreal Flood AdvisoryOUNBlaine, Canadian, Cleveland, Garfield, Grady, Kingfisher and 4 more4 hr
Jul 5, 9:41 AM CDTAreal Flood AdvisoryOUNGreer, Kiowa109 min
Jul 5, 9:54 AM CDTAreal Flood AdvisoryOUNJackson3 hr
Jul 5, 9:55 AM CDTRiver Flood WarningOUNJackson, Kiowa, Tillman41 hr
Jul 5, 10:07 AM CDTAreal Flood WarningOUNCaddo, Kiowa, Washita3 hr
Jul 5, 3:15 PM CDTSevere Thunderstorm WarningOUNWoods37 min
Jul 5, 3:49 PM CDTSevere Thunderstorm WarningOUNHarper, Woodward56 min
Jul 5, 5:40 PM CDTAreal Flood AdvisoryOUNAlfalfa, Woods3 hr
Jul 5, 6:45 PM CDTSevere Thunderstorm WarningOUNGrant, Kay60 min
Jul 4, 9:02 PM CDTAreal Flood AdvisoryOUNArcher, Baylor, Wichita, Wilbarger3 hr
Jul 5, 2:14 AM CDTAreal Flood AdvisoryOUNArcher, Baylor, Wichita, Wilbarger4 hr
Jul 5, 9:58 AM CDTRiver Flood WarningOUNWichita, Wilbarger22 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.