Alert archive / Oklahoma / Flash Flood Warnings in 1999
Flash Flood Warning 29, NWS Tulsa, OK
NWS Tulsa, OK issued this flash flood warning at Apr 26, 1999, 9:45 AM CDT for 5 counties in 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Apr 26, 1999, 9:45 AM CDT (14:45 UTC)
- Expired
- Apr 26, 1999, 2:00 PM CDT
- In force
- 4 hr
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Creek County, OK, McIntosh County, OK, Okfuskee County, OK, Okmulgee County, OK, Tulsa County, OK
The radar
The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 14:45 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, 2.8 hours before the alert went out and 120 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.
- Mixed-layer CAPE
- 518 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 644 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KTSA 261451
FFWTUL
OKC037-091-107-111-121-143-261900-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE TULSA OK
945 AM CDT MON APR 26 1999
THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A
* FLASH FLOOD WARNING FOR
CREEK COUNTY IN OKLAHOMA
MCINTOSH COUNTY IN OKLAHOMA
OKFUSKEE COUNTY IN OKLAHOMA
OKMULGEE COUNTY IN OKLAHOMA
PITTSBURG COUNTY IN OKLAHOMA
TULSA COUNTY IN OKLAHOMA
* UNTIL 200 PM CDT
* AT 945 AM CDT RADAR INDICATED AN AREA OF VERY HEAVY RAIN OVER
OKEMAH..MOVING NORTH AT 20 MPH. AN AREA OF THUNDERSTORMS WITH
HEAVY RAINFALL WILL PRODUCE 1 TO 3 INCHES OVER THE NEXT FEW
HOURS. THESE AREAS RECEIVED 3 TO 5 INCHES OF RAIN YESTERDAY...SO
ANY ADDITIONAL RAINFALL WILL LIKELY LEAD TO 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 YOUtR CAR TO CROSS SAFELY.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO
HIGHER GROUND.
LAT...LON 3545 9642 3533 9627 3482 9590 3486 9559
3537 9561 3628 9586 3606 9648 3592 9655What 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 Apr 26, 9:40 AM CDT, 5 minutes earlier.
Area forecast discussion, Apr 26, 9:40 AM CDT, 5 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 940 AM CDT MON APR 26 1999 WALKED INTO A BUZZ SAW THIS MORNING WITH AWIPS PROBLEMS AND SEVERE WEATHER. HAVE ISSUED A FLASH FLOOD WATCH FOR ENTIRE AREA AGAIN TODAY AS ANY ADDITIONAL RAINS WILL MOST CERTAINLY CAUSE ADDITIONAL RISES AND FLOODING DUE TO RECENT HEAVY RAINS ACROSS MOST OF THE CWA. LATEST 1HR AND 3HR FFG VALUES RUNNING 1.5 INCHES OR LESS WITH MANY 1HRS BELOW 1.00 INCH. UPDATED ZONES AND FFA ALREADY SENT. HOWIESON FCSTID = 44 .TUL... AR...FFA ALL ZONES TODAY. OK...FFA ALL ZONES TODAY.
In the hours before
Special weather statement, Apr 26, 6:15 AM CDT, 3 hours 30 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-271100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 615 AM CDT MON APR 26 1999 ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE FROM MID MORNING THROUGH THIS EVENING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... .SYNOPSIS... AN UPPER LOW OVER COLORADO/NEW MEXICO WILL MOVE EAST INTO KANSAS AND OKLAHOMA DURING THE DAY. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP AHEAD OF THIS UPPER LOW. A WEAK SURFACE FRONT WILL ALSO MOVE INTO EASTERN OKLAHOMA DURING THE AFTERNOON TO HELP INITIATE MORE THUNDERSTORM DEVELOPMENT. .DISCUSSION... AN UPPER LEVEL IMPULSE HAS HELPED DEVELOP STRONG THUNDERSTORMS OVER NORTH CENTRAL TEXAS AND SOUTHWEST OKLAHOMA. THESE STORMS WILL MOVE INTO EASTERN OKLAHOMA LATER THIS MORNING. AND ALTHOUGH THE AIRMASS THIS MORNING IS RELATIVELY STABLE...AN ISOLATED STORM COULD PRODUCE MARGINALLY SEVERE WEATHER BEFORE NOON. HOWEVER...THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY RAIN. THE AIRMASS OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS WILL BECOME MORE UNSTABLE THIS AFTERNOON...AS SURFACE TEMPERATURES WARM INTO THE 70S AND AS THE UPPER LOW BRINGS COOLER AIR ALOFT OVER THE AREA. MODERATE CONVERGENCE ALONG THE SURFACE FRONT SHOULD PROVIDE SUFFICIENT LIFT TO DEVELOP THUNDERSTORMS...SOME OF WHICH MAY BECOME SEVERE. LARGE HAIL WILL BE THE MAIN THREAT...ALTHOUGH STRONG WINDS WILL ALSO BE POSSIBLE. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION MAY BE NECESSARY LATER THIS MORNING IN EASTERN OKLAHOMA. SPOTTER ACTIVATION SHOULD BE EXPECTED OVER EASTERN OKLAHOMA LATER THIS AFTERNOON...AND IN NORTHWEST ARKANSAS THIS EVENING.
Special weather statement, Apr 26, 6:15 AM CDT, 3 hours 30 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-271100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 615 AM CDT MON APR 26 1999 ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE FROM MID MORNING THROUGH THIS EVENING ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS... .SYNOPSIS... AN UPPER LOW OVER COLORADO/NEW MEXICO WILL MOVE EAST INTO KANSAS AND OKLAHOMA DURING THE DAY. STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP AHEAD OF THIS UPPER LOW. A WEAK SURFACE FRONT WILL ALSO MOVE INTO EASTERN OKLAHOMA DURING THE AFTERNOON TO HELP INITIATE MORE THUNDERSTORM DEVELOPMENT. .DISCUSSION... AN UPPER LEVEL IMPULSE HAS HELPED DEVELOP STRONG THUNDERSTORMS OVER NORTH CENTRAL TEXAS AND SOUTHWEST OKLAHOMA. THESE STORMS WILL MOVE INTO EASTERN OKLAHOMA LATER THIS MORNING. AND ALTHOUGH THE AIRMASS THIS MORNING IS RELATIVELY STABLE...AN ISOLATED STORM COULD PRODUCE MARGINALLY SEVERE WEATHER BEFORE NOON. HOWEVER...THE MAIN THREAT FROM THESE STORMS WILL BE HEAVY RAIN. THE AIRMASS OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS WILL BECOME MORE UNSTABLE THIS AFTERNOON...AS SURFACE TEMPERATURES WARM INTO THE 70S AND AS THE UPPER LOW BRINGS COOLER AIR ALOFT OVER THE AREA. MODERATE CONVERGENCE ALONG THE SURFACE FRONT SHOULD PROVIDE SUFFICIENT LIFT TO DEVELOP THUNDERSTORMS...SOME OF WHICH MAY BECOME SEVERE. LARGE HAIL WILL BE THE MAIN THREAT...ALTHOUGH STRONG WINDS WILL ALSO BE POSSIBLE. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION MAY BE NECESSARY LATER THIS MORNING IN EASTERN OKLAHOMA. SPOTTER ACTIVATION SHOULD BE EXPECTED OVER EASTERN OKLAHOMA LATER THIS AFTERNOON...AND IN NORTHWEST ARKANSAS THIS EVENING.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 9:21 AM CDT | Severe Thunderstorm Warning | TSA | Creek | 24 min |
| Apr 26, 9:45 AM CDT | Flash Flood Warning | TSA | Pittsburg | 4 hr |
| Apr 26, 11:27 AM CDT | Flash Flood Warning | TSA | Craig, Mayes, Nowata, Rogers, Wagoner, Washington | 3 hr |
| Apr 26, 11:27 AM CDT | Flash Flood Warning | TSA | Osage | 3 hr |
| Apr 26, 11:27 AM CDT | Flash Flood Warning | TSA | Muskogee | 3 hr |
| Apr 26, 11:57 AM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 48 min |
| Apr 26, 12:33 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 42 min |
| Apr 26, 1:49 PM CDT | Flash Flood Warning | TSA | Craig, Ottawa | 116 min |
| Apr 26, 6:34 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 41 min |
Nearby
Flash Flood Warnings in Oklahoma, 1999Every 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; radar from the NEXRAD Level II archive.