Alert archive / Oklahoma / Flash Flood Warnings in 1999
Flash Flood Warning 27, NWS Tulsa, OK
NWS Tulsa, OK issued this flash flood warning at Apr 25, 1999, 12:10 PM CDT for Osage County, Washington 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 the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Apr 25, 1999, 12:10 PM CDT (17:10 UTC)
- Expired
- Apr 25, 1999, 3:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Osage County, OK, Washington County, OK
The radar
The Tulsa radar (KINX), 94 km from the middle of the area, began a volume at 17:09 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, 5.2 hours before the alert went out and 188 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 654 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 184 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KTSA 251715 FFWTUL OKC113-117-147-252015- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE TULSA OK 1210 PM CDT SUN APR 25 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * FLASH FLOOD WARNING FOR OSAGE COUNTY IN OKLAHOMA PAWNEE COUNTY IN OKLAHOMA WASHINGTON COUNTY IN OKLAHOMA * UNTIL 300 PM CDT * AT 1210 PM CDT RADAR INDICATED AN AREA OF MODERATE RAIN OVER MUCH OF NORTHEAST OKLAHOMA..MOVING NORTHEAST AT 20 MPH. RAIN GAGE REPORTS INDICATE THAT BETWEEN 3 TO 5 INCHES OF RAIN HAS FALLEN OVER PORTIONS OF OSAGE...PAWNEE AND WASHINGTON COUNTIES SINCE EARLY THIS MORNING. WHILE RAINFALL RATES WILL GRADUALLY DIMINISH THIS AFTERNOON...AN ADDITIONAL .5 TO 1 INCH OF RAIN WILL BE POSSIBLE. EXCESSIVE RUNOFF WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING. LAT...LON 3690 9674 3624 9678 3649 9585 3698 9584
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 Apr 25, 10:55 AM CDT, 1 hour 15 minutes earlier.
Area forecast discussion, Apr 25, 10:55 AM CDT, 1 hour 15 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 1055 AM CDT SUN APR 25 1999 MID-LEVEL SHORTWAVE EMBEDDED IN DEEP SUBTROPICAL PLUME CONTINUES TO ENHANCE SHRA/TSRA OVER A LARGE PART OF NRN TX...CNTRL/ERN OK AND ERN KS. SIGNIFICANT RAINFALL HAS BEEN CONFINED TO AREAS N OF 925 MB CONVERGENCE BOUNDARY...MAINLY OVER NERN OK WHERE 2 TO 4 INCH AMOUNTS WERE COMMON. WILL TWEAK POPS AND LOWER TEMPS A LITTLE...OTHERWISE CURRENT FORECAST HAS A GOOD HANDLE ON SITUATION. UPDATED ZONES WILL BE OUT AROUND 1115 AM. FCSTID = 18 .... AR...FFA ALL ZONES THROUGH TONIGHT. OK...FFA ALL ZONES THROUGH TONIGHT.
In the hours before
Special weather statement, Apr 25, 6:20 AM CDT, 5 hours 50 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-261100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 620 AM CDT SUN APR 25 1999 ...FLASH FLOODING WILL BE POSSIBLE TODAY AND TONIGHT... ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE TONIGHT... .SYNOPSIS... AN UPPER LEVEL LOW PRESSURE AREA OVER THE SOUTHWEST U.S. WILL MOVE EAST TODAY AND TONIGHT...CAUSING WINDS TO BECOME MORE SOUTHERLY AT ALL LEVELS OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THESE SOUTHERLY WINDS WILL KEEP THE ATMOSPHERE VERY MOIST AND INCREASINGLY UNSTABLE. THIS COMBINATION IS EXPECTED TO KEEP SHOWERS AND THUNDERSTORMS ACTIVE ACROSS THE AREA THROUGH TONIGHT. .DISCUSSION... CONVECTION IS EXPECTED TO GRADUALLY SPREAD ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS DURING THE MORNING AND INTO THE AFTERNOON. A BREAK IN THE ACTIVITY IS EXPECTED LATE THIS AFTERNOON AND EARLY THIS EVENING AS ONE UPPER LEVEL DISTURBANCE MOVES EAST OF THE AREA. HOWEVER... ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER WESTERN OKLAHOMA NEAR THE DRY LINE. THESE THUNDERSTORMS WILL SPREAD EAST...REACHING EASTERN OKLAHOMA THIS EVENING AND NORTHWEST ARKANSAS LATER TONIGHT. BY THE TIME THESE THUNDERSTORMS REACH EASTERN OKLAHOMA...THEY SHOULD BE LINEAR...WITH THE PRIMARY SEVERE WEATHER THREAT BEING LARGE HAIL AND HIGH WIND. AN ADDITIONAL SEVERE WEATHER HAZARD WILL BE FROM FLASH FLOODING. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR ALL OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS FOR TODAY AND TONIGHT. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION IS NOT EXPECTED UNTIL THIS EVENING FOR EASTERN OKLAHOMA...AND LATER TONIGHT FOR NORTHWEST ARKANSAS.
Special weather statement, Apr 25, 6:20 AM CDT, 5 hours 50 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-261100- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 620 AM CDT SUN APR 25 1999 ...FLASH FLOODING WILL BE POSSIBLE TODAY AND TONIGHT... ...ISOLATED SEVERE THUNDERSTORMS WILL BE POSSIBLE TONIGHT... .SYNOPSIS... AN UPPER LEVEL LOW PRESSURE AREA OVER THE SOUTHWEST U.S. WILL MOVE EAST TODAY AND TONIGHT...CAUSING WINDS TO BECOME MORE SOUTHERLY AT ALL LEVELS OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THESE SOUTHERLY WINDS WILL KEEP THE ATMOSPHERE VERY MOIST AND INCREASINGLY UNSTABLE. THIS COMBINATION IS EXPECTED TO KEEP SHOWERS AND THUNDERSTORMS ACTIVE ACROSS THE AREA THROUGH TONIGHT. .DISCUSSION... CONVECTION IS EXPECTED TO GRADUALLY SPREAD ACROSS EASTERN OKLAHOMA AND NORTHWEST ARKANSAS DURING THE MORNING AND INTO THE AFTERNOON. A BREAK IN THE ACTIVITY IS EXPECTED LATE THIS AFTERNOON AND EARLY THIS EVENING AS ONE UPPER LEVEL DISTURBANCE MOVES EAST OF THE AREA. HOWEVER... ADDITIONAL THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER WESTERN OKLAHOMA NEAR THE DRY LINE. THESE THUNDERSTORMS WILL SPREAD EAST...REACHING EASTERN OKLAHOMA THIS EVENING AND NORTHWEST ARKANSAS LATER TONIGHT. BY THE TIME THESE THUNDERSTORMS REACH EASTERN OKLAHOMA...THEY SHOULD BE LINEAR...WITH THE PRIMARY SEVERE WEATHER THREAT BEING LARGE HAIL AND HIGH WIND. AN ADDITIONAL SEVERE WEATHER HAZARD WILL BE FROM FLASH FLOODING. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR ALL OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS FOR TODAY AND TONIGHT. .EMERGENCY MANAGEMENT AGENCY AND SPOTTER ACTIVATION... SPOTTER ACTIVATION IS NOT EXPECTED UNTIL THIS EVENING FOR EASTERN OKLAHOMA...AND LATER TONIGHT FOR NORTHWEST ARKANSAS.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 7:35 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 40 min |
| Apr 25, 9:20 AM CDT | Flash Flood Warning | TSA | Osage, Pawnee, Tulsa, Washington | 3 hr |
| Apr 25, 11:14 AM CDT | Flash Flood Warning | TSA | Craig, Mayes, Rogers | 4 hr |
| Apr 25, 11:14 AM CDT | Flash Flood Warning | TSA | Ottawa | 4 hr |
| Apr 25, 11:14 AM CDT | Flash Flood Warning | TSA | Nowata | 4 hr |
| Apr 25, 11:39 AM CDT | Flash Flood Warning | TSA | Tulsa, Wagoner | 3 hr |
| Apr 25, 11:39 AM CDT | Flash Flood Warning | TSA | Creek | 3 hr |
| Apr 25, 12:10 PM CDT | Flash Flood Warning | TSA | Pawnee | 3 hr |
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.