Alert archive / Oklahoma / Flash Flood Warnings in 1998

Flash Flood Warning 8, NWS Norman, OK

January 31, 1998Caddo County, Grady County, Oklahoma

NWS Norman, OK issued this flash flood warning at Jan 31, 1998, 9:57 PM CST for Caddo 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: Jan 31, 1998, 9:57 PM CST (03:57 UTC)
Expired: Feb 1, 1998, 1:00 AM CST
In force: 3 hr
Issued by: NWS Norman, OK
Area: Whole counties

Counties Caddo County, OK, Grady County, OK

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.0 hours before the alert went out and 68 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 515 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 336 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOKC 010439 COR
FFWOKC
OKC015-051-010700-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED UGC
NATIONAL WEATHER SERVICE NORMAN OK
957 PM CST SAT JAN 31 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 100 AM CST FOR PEOPLE IN THE FOLLOWING COUNTIES

IN CENTRAL OKLAHOMA
     GRADY

IN SOUTHWEST OKLAHOMA
     SOUTHERN CADDO

INCLUDING THE FOLLOWING LOCATIONS
     MINCO...TUTTLE...POCASSET...GRACEMONT...AMBER...MIDDLEBERG...
     WASHITA...FORT COBB...VERDEN...ANADARKO...TABLER...NORGE...
     LAVERTY...NINNEKAH...STECKER...CEMENT...ALEX...BOONE...CYRIL...
     AGAWAM...ACME...RUSH SPRINGS AND CHICKASHA

AT 957 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED 
INDICATE THUNDERSTORMS WITH VERY HEAVY RAIN ACROSS MUCH OF GRADY AND 
SOUTHERN CADDO COUNTIES. THESE THUNDERSTORMS ARE EXPECTED TO 
CONTINUE TO TRACK EAST ACROSS AREAS THAT HAVE RECEIVED HEAVY 
RAINFALL TONIGHT.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODS. DO NOT STAY IN AREAS SUBJECT TO FLOODING
WHEN WATER BEGINS RISING. IT IS VERY DIFFICULT AT NIGHT TO TELL HOW
MUCH WATER IS ON ROADS. MOTORISTS SHOULD NOT DRIVE THROUGH WATER OF
UNKNOWN DEPTH.


CB

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 Jan 31, 9:35 PM CST, 22 minutes earlier.

Area forecast discussion, Jan 31, 9:35 PM CST, 22 minutes before

FPUS3 KOKC 010341
AFDOKC
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORMAN OK
935 PM CST SAT JAN 31 1998

... 8TH WETTEST JANUARY FOR KOKC PLUS LOCALLY HEAVY RAINFALL POSSIBLE
ACROSS CENTRAL... SOUTH CENTRAL AND SOUTHWEST OKLAHOMA TONIGHT...

COMPLEX SPRINGLIKE PATTERN IS EXPECTED TO REMAIN OVER THE FA THE
REMAINDER OF TONIGHT. 03Z SFC ANALYSIS INDICATES VERY LITTLE
MOVEMENT OF SYNOPTIC AND MESOSCALE FEATURES THE PAST 09 HOURS. WEAK
OCCLUDED FRONT EXTENDS SOUTHWARD FROM SE NEB AND CNTRL KS ACRS WRN
OKLAHOMA TO A SFC LOW OVR NW TX S OF KCDS. PATTERN GETS MESSY FM
THERE WITH A DVLPG WMFNT EXTENDING EWD ALG RED RIVER WITH A STNRY
FNT/DRY LINE EXTENDING SWD TO THE LWR RIO GRANDE VALLEY WHILE A WEAK
CDFNT EXTENDS WWD FM THE SFC LOW OVER SRN NM. DRY AIR OVR TX/OK
PNHNDLS ALLOWING FOR GOOD RADITIONAL COOLING WHICH HELPING TO
INCREASING BAROCLINICITY/UPLIFT ALG FRONTAL ZONE ACRS SW AND CNTRL
OKLAHOMA.

ALOFT... LOW-LEVEL FLOW HAS CONTINUED TO BACK TO SLY WITH NICE 35-40
KT 850 JET DVLPG ACRS CNTRL OKLA. 700-500 MB FLOW HAS BACKED FM WEST
TO SW INDCTG STRNGTHNG S/W TROF AND UVV APCHG FM TX PNHDL. NARROW
WEDGE OF ELEVATED INSTABILITY SHOWS UP NICELY ON 00Z OUN SOUNDING
AND IN SFC DEWPOINT TRAJECTORIES.

CAPES OF 500-1000 J/KG WILL CONTINUE OVERSPREAD NRN 2/3S OF FA AND
ALLOW FOR MARGINAL SVR TSRA MAINLY DUE TO TO HAIL. LOW WBZERO HGT
INDCTS SIG FALLS OF SMALL HAIL POSSIBLE IN SOME OF THE STRGR STMS.
HWVR... INSTABILITY EXPECTED TO WEAKEN AS WARMER MID-LEVEL TEMPS
ADVECT ACRS AREA AND SFC AIR COOLS AND STABILIZES ACRS CNTRL/NRN TX.
CONVRGNC ASSOCD WITH LOW-LEVEL JET AND WSWLY MID-LVL FLOW
WILL HELP PRODUCE SOME ADDITONAL TRAINING OF ECHOES ACRS SW AND
CNTRL OK THROUGH EARLY MORNING. ALREADY RCVD A FEW REPORTS OF
LOCALLY HEAVY RAINFALL  NEAR 1 1/2 INCH IN SW AND CNTRL ZONES.
HWVR... ONLY MODERATE PWS AND RELATIVELY FAST MOVEMENT OF CELLS
SHOULD PRECLUDE THE NEED FOR A FLASH FLOOD WATCH. BULK OF CURRENT
ZFP LOOKS GOOD AND WILL ONLY UPDATE TO MENTION LOCALLY HEAVY
RAINFALL POSSIBLE FOR CENTRAL AND SOUTHWEST COUNTIES MAINLY ALG AND
SOUTH OF I-40. DUE TO SATURATED GROUND ACRS NW AND WRN OKLAHOMA...
CLEARING SKIES AND GOOD RADTNL COOLING WILL LIKELY RESULT IN THICK
FOG DVLPG. HWVR... WILL LET MIDSHIFT ASSESS NEED FOR FOG ADVISORY
BUT WILL MENTION LOCALLY DENSE FOG IN THE AFOREMENTIONED AREAS.

FCSTID= STEWART
.OKC...
OK...NONE.
TX...NONE.

In the hours before

Local storm report, Jan 31, 9:00 PM CST, 57 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
900 PM CST SAT JAN 31 1998

TIME(CST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0845 PM    2 NNE COOPERTON           OK   0.75 INCH HAIL
1/31/98    KIOWA

JS

Local storm report, Jan 31, 9:00 PM CST, 57 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
900 PM CST SAT JAN 31 1998

TIME(CST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0845 PM    2 NNE COOPERTON           OK   0.75 INCH HAIL
1/31/98    KIOWA

JS

Local storm report, Jan 31, 9:40 PM CST, 17 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
900 PM CST SAT JAN 31 1998

TIME(CST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0845 PM    1 N COOPERTON             OK   0.75 INCH HAIL
1/31/98    KIOWA                          3 INCHES DEEP ON
                                          HIGHWAY 54
JS

Local storm report, Jan 31, 9:50 PM CST, 7 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
950 PM CST SAT JAN 31 1998

TIME(CST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0940 PM    COLD SPRINGS              OK   3 INCH RAINFALL
1/31/98    KIOWA                          MEASURED BY AMATEUR
                                          RADIO OPERATOR

JS

Local storm report, Jan 31, 9:50 PM CST, 7 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORMAN OKLAHOMA
950 PM CST SAT JAN 31 1998

TIME(CST)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0940 PM    COLD SPRINGS              OK   3 INCH RAINFALL
1/31/98    KIOWA                          MEASURED BY AMATEUR
                                          RADIO OPERATOR

JS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 31, 7:36 PM CST	Severe Thunderstorm Warning	OUN	Kiowa	39 min
Jan 31, 8:14 PM CST	Severe Thunderstorm Warning	OUN	Greer, Jackson, Kiowa	46 min
Jan 31, 8:49 PM CST	Severe Thunderstorm Warning	OUN	Comanche	41 min
Jan 31, 9:00 PM CST	Flash Flood Warning	OUN	Comanche, Greer, Kiowa	3 hr
Jan 31, 9:31 PM CST	Severe Thunderstorm Warning	OUN	Comanche	59 min
Jan 31, 10:17 PM CST	Severe Thunderstorm Warning	OUN	Comanche	43 min

Nearby

Flash Flood Warnings in Oklahoma, 1998 Every flash flood warning in 1998

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.