Alert archive / Oklahoma / Flash Flood Warnings in 1999

Flash Flood Warning 82, NWS Tulsa, OK

June 30, 1999Haskell County, LeFlore County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Jun 30, 1999, 8:10 AM CDT for Haskell County, LeFlore 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: Jun 30, 1999, 8:10 AM CDT (13:10 UTC)
Expired: Jun 30, 1999, 11:15 AM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Area: Whole counties

Counties Haskell County, OK, LeFlore County, OK

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 1.2 hours before the alert went out and 227 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: 652 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 812 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 394 m²/s²
0-3 km storm-relative helicity: 466 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 9.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 301318
FFWTUL
ARC033-047-131-OKC061-079-301615-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TULSA OK
810 AM CDT WED JUN 30 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* FLASH FLOOD WARNING FOR
  CRAWFORD COUNTY IN NORTHWEST ARKANSAS
  FRANKLIN COUNTY IN NORTHWEST ARKANSAS
  SEBASTIAN COUNTY IN NORTHWEST ARKANSAS
  EASTERN HASKELL COUNTY IN SOUTHEAST OKLAHOMA
  NORTHERN LE FLORE COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 1115 AM CDT

* AT 810 AM CDT RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAIN 
ACROSS THE WARNED AREA.  RADAR ESTIMATES INDICATE 1 TO 2 INCHES HAS 
ALREADY FALLEN IN EASTERN HASKELL...NORTHERN LE FLORE AND PORTIONS 
OF CRAWFORD AND FRANKLIN COUNTIES.  THE HEAVY RAIN IS NOW MOVING 
INTO SEBASTIAN COUNTY AND AN ADDITIONAL 1 TO 2 INCHES OF RAINFALL IS 
POSSIBLE ACROSS THE WARNED AREA.

STIGLER...POTEAU...VAN BUREN...OZARK...FORT SMITH AND ADJACENT 
COMMUNITIES MAY BE AFFECTED BY FLASH FLOODING.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER MAY BE TOO DEEP TO ALLOW YOUR CAR TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND.

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 Tulsa, OK wrote its last area forecast discussion before this flash flood warning went out at Jun 30, 5:10 AM CDT, 3 hours earlier.

Area forecast discussion, Jun 30, 5:10 AM CDT, 3 hours before

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
510 AM CDT WED JUN 30 1999

BUSY ALL NIGHT WITH ONGOING WEATHER SO NOT A LOT OF TIME TO LOOK AT
THINGS OR TO WRITE A DISCUSSION.

WAS GOING TO ISSUE A FLASH FLOOD WATCH FOR TODAY AND POSSIBLY TONIGHT
IN NORTHEAST OKLAHOMA AND NORTHWEST ARKANSAS BUT CURRENT CONVECTION
NOW MAKING DECENT PROGRESS TO THE SOUTH SO DECIDED TO HOLD OFF FOR
NOW. WILL WAIT TO SEE HOW THINGS EVOLVE THE NEXT FEW HOURS BUT MAY
YET NEED A WATCH SOMEWHERE...THE BIG QUESTION IS JUST WHERE.

SEVERAL MESOSCALE CONVECTIVE COMPLEXES WILL LIKELY AFFECT THE AREA
DURING THE NEXT 24 TO 36 HOURS BEFORE MID LEVEL WARMING CAPS THINGS
OFF. WENT WAY ABOVE GUIDANCE POPS AND COOLER THAN GUIDANCE ON
TEMPERATURES ALTHOUGH DO EXPECT SOME WARMUP THURSDAY WITH MORE
SUNSHINE RETURNING BY AFTERNOON.

HAD NO TIME TO LOOK AT EXTENDED SO LITTLE OR NO CHANGES MADE THERE.

THANKS TO CHUCK IN SPRINGFIELD AND GREG IN LITTLE ROCK FOR
COORDINATION.

FCSTID = 5
TUL   80  70  87  72 /  80  70  50  40
FSM   82  72  90  73 /  70  40  30  20
MLC   82  73  90  74 /  70  40  30  20
BVO   80  70  87  72 /  70  70  50  40
FYV   80  70  85  70 /  80  70  50  40
IDB   88  72  91  73 /  50  30  20  10
BYV   80  70  85  70 /  80  70  50  40
MIO   80  70  86  71 /  70  70  50  40
MKO   80  72  88  73 /  90  50  40  30
F10   80  72  88  73 /  90  50  40  30
HHW   88  73  91  74 /  50  30  20  10

.TUL...
AR...NONE.
OK...NONE.

PLATE

In the hours before

Local storm report, Jun 30, 4:22 AM CDT, 3 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
422 AM CDT WED JUN 30 1999

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

0415 AM    2 E SAPULPA               OK    75 MPH TSTM GUST
06/29/99   CREEK

Local storm report, Jun 30, 4:22 AM CDT, 3 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
422 AM CDT WED JUN 30 1999

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

0415 AM    2 E SAPULPA               OK    75 MPH TSTM GUST
06/29/99   CREEK

Local storm report, Jun 30, 4:25 AM CDT, 3 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
425 AM CDT WED JUN 30 1999

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

0415 AM    2 W GLENPOOL              OK    75 MPH TSTM GUST
06/29/99   TULSA

Local storm report, Jun 30, 4:25 AM CDT, 3 hours 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
425 AM CDT WED JUN 30 1999

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

0415 AM    2 W GLENPOOL              OK    75 MPH TSTM GUST
06/29/99   TULSA

Special weather statement, Jun 30, 6:00 AM CDT, 2 hours 10 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-011100-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
600 AM CDT WED JUN 30 1999

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAOMA AND
NORTHWEST ARKANSAS TODAY AND TONIGHT.

.SYNOPSIS...
EARLY THIS MORNING LOW PRESSURE WAS LOCATED OVER THE TEXAS PANHANDLE
WITH A WARM FRONT TO ITS EAST ACROSS CENTRAL OKLAHOMA AND CENTRAL
ARKANSAS.  TODAY AND TONIGHT THE LOW PRESSURE WILL REMAIN OVER THE TEXAS
PANHANDLE AND THE WARM FRONT WILL MOVE SLIGHTLY NORTH TO NEAR THE
KANSAS-OKLAHOMA AND ARKANSAS-MISSOURI BORDERS.

.DISCUSSION...
VERY MOIST AND UNSTABLE AIR WILL RESIDE OVER THE AREA NEAR AND TO THE
SOUTH OF THE WARM FRONT THROUGH TONIGHT.  A FEW ONGOING THUNDERSTORMS
THIS MORNING WILL HAVE THE POTENTIAL TO BE SEVERE AND PRODUCE FLASH
FLOODING.  THESE THUNDERSTORMS WILL GRADUALLY COME TO AN END THIS
MORNING AND SOME BREAKS MAY OCCUR IN THE CLOUD COVER THIS AFTERNOON.
SHOULD THE SUN COME OUT THIS AFTERNOON A FEW THUNDERSTORMS COULD FORM ON
OUTFLOW BOUNDARIES LEFT BEHIND BY THIS MORNINGS STORMS.  A FEW OF THESE
STORMS COULD BRIEFLY BECOME SEVERE.  SHOULD THUNDERSTORMS DEVELOP THIS
AFTERNOON THEY MAY SUBSIDE DURING THE EVENING HOURS.  HOWEVER...IF THEY
DO THE THUNDERSTORM THREAT OF SEVERE WEATHER WILL NOT HAVE ENDED.
THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE EASTERN PLAINS OF
COLORADO AND SOUTHWEST KANSAS LATE THIS AFTERNOON.  THESE STORMS MAY
FORM A COMPLEX OF STORMS WHICH WILL LIKELY MOVE SOUTHEAST AND COULD
AFFECT PARTS OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS LATE TONIGHT.
ONCE AGAIN ENOUGH INSTABILITY AND MOISTURE WILL REMAIN OVER THE AREA FOR
A FEW OF THESE STORMS TO BECOME SEVERE WITH LARGE HAIL AND DAMAGING
WINDS AND ALSO TO PRODUCE HEAVY RAINS WHICH COULD PRODUCE FLASH
FLOODING.

.EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION...
CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS SHOULD MONITOR THE LATEST
STATEMENTS AND FORECASTS CONCERNING THIS POTENTIALLY THREATENING WEATHER
SITUATION.  THEY SHOULD ALSO BE PREPARED FOR POSSIBLE ACTIVATION.

Special weather statement, Jun 30, 6:00 AM CDT, 2 hours 10 minutes before

ARZ001-002-010-011-019-020-029-OKZ049-053>076-011100-

EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TULSA OK
600 AM CDT WED JUN 30 1999

A FEW SEVERE THUNDERSTORMS ARE EXPECTED ACROSS EASTERN OKLAOMA AND
NORTHWEST ARKANSAS TODAY AND TONIGHT.

.SYNOPSIS...
EARLY THIS MORNING LOW PRESSURE WAS LOCATED OVER THE TEXAS PANHANDLE
WITH A WARM FRONT TO ITS EAST ACROSS CENTRAL OKLAHOMA AND CENTRAL
ARKANSAS.  TODAY AND TONIGHT THE LOW PRESSURE WILL REMAIN OVER THE TEXAS
PANHANDLE AND THE WARM FRONT WILL MOVE SLIGHTLY NORTH TO NEAR THE
KANSAS-OKLAHOMA AND ARKANSAS-MISSOURI BORDERS.

.DISCUSSION...
VERY MOIST AND UNSTABLE AIR WILL RESIDE OVER THE AREA NEAR AND TO THE
SOUTH OF THE WARM FRONT THROUGH TONIGHT.  A FEW ONGOING THUNDERSTORMS
THIS MORNING WILL HAVE THE POTENTIAL TO BE SEVERE AND PRODUCE FLASH
FLOODING.  THESE THUNDERSTORMS WILL GRADUALLY COME TO AN END THIS
MORNING AND SOME BREAKS MAY OCCUR IN THE CLOUD COVER THIS AFTERNOON.
SHOULD THE SUN COME OUT THIS AFTERNOON A FEW THUNDERSTORMS COULD FORM ON
OUTFLOW BOUNDARIES LEFT BEHIND BY THIS MORNINGS STORMS.  A FEW OF THESE
STORMS COULD BRIEFLY BECOME SEVERE.  SHOULD THUNDERSTORMS DEVELOP THIS
AFTERNOON THEY MAY SUBSIDE DURING THE EVENING HOURS.  HOWEVER...IF THEY
DO THE THUNDERSTORM THREAT OF SEVERE WEATHER WILL NOT HAVE ENDED.
THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE EASTERN PLAINS OF
COLORADO AND SOUTHWEST KANSAS LATE THIS AFTERNOON.  THESE STORMS MAY
FORM A COMPLEX OF STORMS WHICH WILL LIKELY MOVE SOUTHEAST AND COULD
AFFECT PARTS OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS LATE TONIGHT.
ONCE AGAIN ENOUGH INSTABILITY AND MOISTURE WILL REMAIN OVER THE AREA FOR
A FEW OF THESE STORMS TO BECOME SEVERE WITH LARGE HAIL AND DAMAGING
WINDS AND ALSO TO PRODUCE HEAVY RAINS WHICH COULD PRODUCE FLASH
FLOODING.

.EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION...
CIVIL DEFENSE AGENCIES AND SPOTTER GROUPS SHOULD MONITOR THE LATEST
STATEMENTS AND FORECASTS CONCERNING THIS POTENTIALLY THREATENING WEATHER
SITUATION.  THEY SHOULD ALSO BE PREPARED FOR POSSIBLE ACTIVATION.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 3:23 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	52 min
Jun 30, 4:10 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okmulgee	50 min
Jun 30, 4:37 AM CDT	Severe Thunderstorm Warning	TSA	Tulsa	23 min
Jun 30, 4:45 AM CDT	Flash Flood Warning	TSA	Creek, Okmulgee, Tulsa	2 hr
Jun 30, 5:05 AM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Wagoner	40 min
Jun 30, 5:20 AM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	25 min
Jun 30, 5:42 AM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee, Okmulgee	48 min
Jun 30, 7:34 AM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore, Sequoyah	41 min

Nearby

Flash Flood Warnings in Oklahoma, 1999 Every flash flood warning in 1999

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.