Alert archive / Oklahoma / Flash Flood Warnings in 2004

Flash Flood Warning 8, NWS Norman, OK

April 23, 2004Stephens County, Oklahoma

NWS Norman, OK issued this flash flood warning at Apr 23, 2004, 4:52 PM CDT for Stephens 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 outline as issued.

The facts

Issued: Apr 23, 2004, 4:52 PM CDT (21:52 UTC)
Expired: Apr 23, 2004, 7:45 PM CDT
In force: 3 hr
Issued by: NWS Norman, OK
Area: Counties, with a storm outline in the text

County Stephens County, OK

The radar

The Altus AFB radar (KFDR), 98 km from the middle of the area, began a volume at 21:52 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 9.9 hours before the alert went out and 45 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: 1004 J/kg
Mixed-layer CIN: -134 J/kg
Mixed-layer LCL: 552 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 177 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KOUN 232152
FFWOKC
OKC137-240045-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORMAN OK
452 PM CDT FRI APR 23 2004

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  STEPHENS COUNTY IN SOUTHERN OKLAHOMA

* UNTIL 745 PM CDT

* AT 452 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
A SEVERE THUNDERSTROM WITH VERY HEAVY RAIN OVER DUNCAN...MOVING 
SLOWLY EAST.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  VELMA...MARLOW...EMPIRE CITY...CORUM...COMANCHE AND BRAY.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARM LANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

KEEP CHILDREN FROM PLAYING NEAR RUSHING FLOOD WATERS. THE BANKS OF
STREAMS AND FLOODWAYS ARE SLIPPERY AND RAIN SOFTENED GROUND MAY GIVE
WAY EASILY. DO NOT LET YOUR CHILD BE A VICTIM OF DANGEROUS FLOOD
WATERS

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY.
AS LITTLE AS 6 INCHES OF WATER MAY CAUSE YOU TO LOSE CONTROL OF YOUR
VEHICLE. TWO FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES
INCLUDING SUVS AND PICKUP TRUCKS. VEHICLES CAUGHT IN RISING WATER
SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.

LAT...LON 3468 9812 3431 9814 3438 9769 3467 9758

$$

SIX

1 follow-up statement

000 
WGUS74 KOUN 232249
FFSOKC
OKC137-240045-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
545 PM CDT FRI APR 23 2004

...FLASH FLOOD WARNING CONTINUES FOR STEPHENS COUNTY UNTIL 745 PM...

AS OF 545 PM...RAINFALL OF 3 INCHES AND MORE HAS BEEN REPORTED IN 
THE DUNCAN AREA IN LESS THAN ONE HOUR. THESE THUNDERSTORMS NOW 
EXTEND FROM LAKE FUQUA TO COMANCHE WITH NEW THUNDERSTORMS MOVING 
OVER AREAS THAT HAVE ALREADY RECEIVED HEAVY RAINFALL. THERE ARE 
REPORTS OF TWO TO THREE FEET OF WATER OVER HIGHWAY 81 AND IN 
DUNCAN. PEOPLE THROUGHOUT STEPHENS COUNTY SHOULD EXERCISE EXTREME 
CAUTION.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY. 
AS LITTLE AS 6 INCHES OF WATER MAY CAUSE YOU TO LOSE CONTROL OF YOUR 
VEHICLE. TWO FEET OF RUSHING WATER CAN CARRY AWAY MOST VEHICLES 
INCLUDING SUVS AND PICKUP TRUCKS. VEHICLES CAUGHT IN RISING WATER 
SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARM LANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

LAT...LON 3468 9757 3431 9772 3431 9809 3468 9806

$$

...SPEG.

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 Apr 23, 3:45 PM CDT, 1 hour 7 minutes earlier.

Area forecast discussion, Apr 23, 3:45 PM CDT, 1 hour 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
345 PM CDT FRI APR 23 2004

.DISCUSSION...
SEVERE THUNDERSTORMS AND HEAVY RAIN WILL INFLUENCE THE AREA
OVERNIGHT AS A SURFACE LOW OVER WEST TEXAS LIFTS NORTHEASTWARD
THROUGH THE AREA. FLOOD WATCH ISSUED EARLIER TODAY HAS BEEN EXPANDED
TO INCLUDE A FEW MORE COUNTIES WEST OF THE INITIAL WATCH. AREAS OF
DENSE FOG WILL LIKELY DEVELOP OR EXPAND NORTH OF THE FRONTAL
BOUNDARY LATER TONIGHT AS WARMER TEMPS/HIGHER DEWPOINT ADVECT OVER
COOL AND WET GROUND. MOST OF THE RAIN SHOULD END BY MIDDAY SATURDAY
AS DEEP MOISTURE SHIFTS EAST OF THE AREA AND LIFT DIMINISHES. SUBSIDENCE
AND A MORE STABLE AIRMASS WILL THEN INFLUENCE THE AREA SUNDAY
THROUGH WEDNESDAY...BEFORE ANOTHER LONGWAVE TROUGH DEVELOPS OVER THE
WESTERN UNITED STATES. MEDIUM RANGE MODELS ARE FAIRLY CONSISTENT IN
A CANADIAN AIRMASS EJECTING SOUTHWARD BY THE END OF THE WEEK...WITH
MUCH COOLER HIGHS EXPECTED OVER NORTHWEST OR NORTHERN PARTS OF THE
AREA BY LATE THURSDAY OR FRIDAY. CHANCE POPS APPEAR WARRANTED THIS
TIME AS WELL.

.PRELIMINARY POINT TEMPS/POPS...
OKLAHOMA CITY OK  61  66  50  71 / 100  90  20   0
HOBART OK         50  62  49  72 /  90  30  10   0
WICHITA FALLS TX  58  69  52  74 / 100  40  20   0
GAGE OK           45  55  45  71 /  60  40  10   0
PONCA CITY OK     56  63  49  69 / 100 100  30   0
DURANT OK         69  76  55  73 /  70  90  40   0

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...FLOOD WATCH TONIGHT MOST OF OKLAHOMA EXCEPT EXTREME WESTERN
AREAS.
TX...FLOOD WATCH TONIGHT ALL BUT FOARD/HARDEMAN/KNOX COUNTIES

JAMES

Hazardous weather outlook, Apr 23, 12:09 PM CDT, 4 hours 43 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1205 PM CDT FRI APR 23 2004

OKZ004>048-050>052-TXZ083>090-241200-

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

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

THUNDERSTORM OUTLOOK...
THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS OVER MUCH OF
WESTERN NORTH TEXAS AND SOUTHERN OKLAHOMA. THERE IS A SLIGHT RISK
TO THE NORTH OF THE MODERATE RISK ACROSS THE REMAINDER OF WESTERN
NORTH TEXAS AND MUCH OF OKLAHOMA.

LOCATION...
THE MODERATE RISK AREA IS ALONG AND SOUTH OF A LINE FROM TRUSCOTT TO
VERNON TEXAS... TO PAULS VALLEY OKLAHOMA TO DURANT OKLAHOMA. THE
SLIGHT RISK AREA IS NORTH OF THE MODERATE RISK AND COVERS THE
REMAINDER OF THE AREA.

TIMING...
SEVERE THUNDERSTORMS ARE MOST LIKELY FROM 3 PM THROUGH THE EVENING
HOURS.

IMPACTS...
HAIL TO THE SIZE OF BASEBALLS AND WINDS TO 70 MPH ARE EXPECTED IN
THE MODERATE RISK AREA... ALONG WITH THE POTENTIAL FOR TORNADOES. IN
THE SLIGHT RISK AREA...HAIL TO THE QUARTERS AND WINDS TO 70 MPH
ARE EXPECTED.

RECOMMENDED ACTIONS...
EMERGENCY MANAGEMENT AND STORM SPOTTER GROUPS SHOULD BE PREPARED FOR
SEVERE WEATHER OPERATIONS FROM MID AFTERNOON THROUGH THE EVENING
HOURS.

DISCUSSION...
A WARM FRONT CONTINUES TO MOVE SLOWLY NORTH ACROSS WESTERN NORTH
TEXAS AND SOUTHERN OKLAHOMA AND EARLY THIS AFTERNOON EXTENDS FROM
NEAR CROWELL TEXAS TO FREDERICK AND SEMINOLE OKLAHOMA. THE AIRMASS
TO THE SOUTH OF THIS BOUNDARY IS QUITE UNSTABLE. SOME OF THIS
UNSTABLE AIR IS MOVING ABOVE THE WARM FRONT AND SHOWERS AND
THUNDERSTORMS DEVELOPED IN NORTHERN OKLAHOMA THIS MORNING.

SHOWERS AND THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE THIS
AFTERNOON. ACROSS NORTHERN OKLAHOMA... THESE THUNDERSTORMS WILL
REMAIN ELEVATED OVER THE SHALLOW COOL AIR NORTH OF THE FRONT... BUT
WILL STILL BE CAPABLE OF PRODUCING DAMAGING WINDS AND HAIL TO THE
SIZE OF QUARTERS. FARTHER SOUTH... THE INSTABILITY AND WIND SHEAR
WILL SUPPORT SUPERCELL THUNDERSTORMS NEAR AND SOUTH OF THE WARM
FRONT. THUNDERSTORMS IN THIS AREA WILL BE CAPABLE OF PRODUCING
LARGER HAIL IN ADDITION TO DAMAGING WINDS AND ISOLATED TORNADOES
WILL BE POSSIBLE.

ALTHOUGH THE THREAT OF SEVERE WEATHER WILL DECREASE BY LATE
EVENING... AS THE UPPER LEVEL LOW CONTINUES TO AFFECT THE AREA
OVERNIGHT... SEVERE THUNDERSTORMS WILL STILL BE POSSIBLE. LARGE HAIL
WILL BECOME THE PRIMARY SEVERE WEATHER THREAT OVERNIGHT.

PROBABILITY TABLE...
VALID THROUGH 700 AM CDT SATURDAY APR 24.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
              NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...100 PERCENT.

OTHER HAZARDOUS WEATHER...
TORRENTIAL RAIN MAY ACCOMPANY THUNDERSTORMS THIS AFTERNOON AND
TONIGHT...DUE TO SLOW MOVEMENT...AND OR REPEATED ROUNDS OF HEAVY
RAIN FROM ADDITIONAL THUNDERSTORMS OVERNIGHT.  A FLASH FLOOD WATCH
IS IN EFFECT.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

THUNDERSTORM OUTLOOK...
THUNDERSTORMS WILL POSSIBLY BE ONGOING SATURDAY MORNING ACROSS MUCH
OF OKLAHOMA AND WESTERN NORTH TEXAS AS THE SLOW MOVING UPPER LEVEL
LOW MAKES ITS WAY EAST ACROSS THE SOUTHERN PLAINS. THE POTENTIAL
WILL EXIST BY SATURDAY AFTERNOON ACROSS SOUTH CENTRAL AND SOUTHEAST
OKLAHOMA FOR SOME OF THESE STORMS TO BE ACCOMPANIED BY LARGE HAIL.
THUNDERSTORMS RETURN TO THE FORECAST NEXT THURSDAY.

OTHER HAZARDOUS WEATHER...
NONE.

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

26

In the hours before

Local storm report, Apr 23, 4:32 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
432 PM CDT FRI APR 23 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0431 PM     HAIL             5 W DUNCAN              34.52N 98.06W
04/23/2004  1.00 INCH        STEPHENS           OK   PUBLIC

&&

KT

Local storm report, Apr 23, 4:40 PM CDT, 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
440 PM CDT FRI APR 23 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0425 PM     HAIL             GOLTRY                  36.53N 98.15W
04/23/2004  0.75 INCH        ALFALFA            OK   EMERGENCY MNGR

            HAIL REPORTED BY CITY EMERGENCY MANAGER.

0439 PM     HAIL             8 E SEYMOUR             33.60N 99.12W
04/23/2004  0.75 INCH        BAYLOR             TX   PUBLIC

&&

KT

Local storm report, Apr 23, 4:41 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
441 PM CDT FRI APR 23 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0435 PM     HAIL             MEDFORD                 36.81N 97.73W
04/23/2004  1.25 INCH        GRANT              OK   LAW ENFORCEMENT

&&

KT

Local storm report, Apr 23, 4:46 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
446 PM CDT FRI APR 23 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0445 PM     HAIL             5 W DUNCAN              34.52N 98.06W
04/23/2004  1.00 INCH        STEPHENS           OK   PUBLIC

            HAIL COVERED THE GROUND.

&&

KT

Local storm report, Apr 23, 4:50 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OK
450 PM CDT FRI APR 23 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

0446 PM     HAIL             4 SSW DUNCAN            34.47N 98.00W
04/23/2004  0.75 INCH        STEPHENS           OK   AMATEUR RADIO

0448 PM     HAIL             DUNCAN                  34.52N 97.97W
04/23/2004  1.75 INCH        STEPHENS           OK   AMATEUR RADIO

&&

KT

Special weather statement, Apr 23, 4:52 PM CDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
452 PM CDT FRI APR 23 2004

OKZ022-023-232200-
CADDO OK-WASHITA OK-
452 PM CDT FRI APR 23 2004

...SIGNIFICANT WEATHER ADVISORY...

THIS SIGNIFICANT WEATHER ADVISORY IS FOR CADDO AND WASHITA COUNTIES.

A STRONG THUNDERSTORM WAS LOCATED 7 MILES WEST OF FORT COBB RESERVOIR
AT 452 PM CDT...MOVING NORTH AT 35 MPH.

THIS STORM APPEARS TO BE CAPABLE OF PRODUCING HAIL TO HALF AN INCH
IN DIAMATER... AND MAY INCREASE IN INTENSITY.

PEOPLE IN CADDO AND WASHITA COUNTIES SHOULD MONITOR THE WEATHER
SITUATION CLOSELY. LISTEN FOR WARNINGS AND REMAIN ALERT FOR
THREATENING WEATHER CONDITIONS.

CMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	45 min
Apr 22, 10:28 PM CDT	Severe Thunderstorm Warning	OUN	Seminole	47 min
Apr 22, 11:40 PM CDT	Severe Thunderstorm Warning	OUN	Canadian	35 min
Apr 23, 12:24 AM CDT	Severe Thunderstorm Warning	OUN	Logan, Oklahoma	51 min
Apr 23, 1:56 PM CDT	Severe Thunderstorm Warning	OUN	Custer	34 min
Apr 23, 1:57 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	48 min
Apr 23, 2:04 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Major	26 min
Apr 23, 2:27 PM CDT	Severe Thunderstorm Warning	OUN	Major	48 min
Apr 23, 2:43 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	47 min
Apr 23, 2:56 PM CDT	Tornado Warning	OUN	Cotton, Tillman	49 min
Apr 23, 3:15 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major	45 min
Apr 23, 3:19 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	41 min
Apr 23, 3:44 PM CDT	Tornado Warning	OUN	Cotton	46 min
Apr 23, 3:50 PM CDT	Severe Thunderstorm Warning	OUN	Major	40 min
Apr 23, 3:54 PM CDT	Severe Thunderstorm Warning	OUN	Grant	51 min
Apr 23, 3:58 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Stephens	47 min
Apr 23, 4:25 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield	35 min
Apr 23, 4:29 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	46 min
Apr 23, 4:44 PM CDT	Severe Thunderstorm Warning	OUN	Grant	31 min
Apr 23, 4:44 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	46 min
Apr 23, 5:11 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Major	49 min
Apr 23, 5:15 PM CDT	Severe Thunderstorm Warning	OUN	Grant	30 min
Apr 23, 5:23 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian	37 min
Apr 23, 5:27 PM CDT	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	48 min
Apr 23, 5:30 PM CDT	Severe Thunderstorm Warning	OUN	Washita	45 min
Apr 23, 5:42 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	33 min
Apr 23, 6:08 PM CDT	Severe Thunderstorm Warning	OUN	Garvin	52 min
Apr 23, 6:13 PM CDT	Severe Thunderstorm Warning	OUN	Kay	17 min
Apr 23, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	46 min
Apr 23, 6:28 PM CDT	Severe Thunderstorm Warning	OUN	Blaine	47 min
Apr 23, 6:33 PM CDT	Severe Thunderstorm Warning	OUN	Kay	27 min
Apr 23, 6:37 PM CDT	Severe Thunderstorm Warning	OUN	Marshall	23 min
Apr 23, 6:50 PM CDT	Severe Thunderstorm Warning	OUN	Johnston	40 min

Nearby

Flash Flood Warnings in Oklahoma, 2004 Every flash flood warning in 2004

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.