Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 593, NWS Tulsa, OK
NWS Tulsa, OK issued this severe thunderstorm warning at Dec 4, 1999, 10:32 AM CST for Adair County, Cherokee County, Oklahoma. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 4, 1999, 10:32 AM CST (16:32 UTC)
- Expired
- Dec 4, 1999, 11:15 AM CST
- In force
- 43 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties
Counties Adair County, OK, Cherokee County, OK
The nearest sounding before it
Springfield, MO (KSGF), launched 12:00Z, 4.5 hours before the alert went out and 145 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
- 920 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 200 m²/s²
- 0-3 km storm-relative helicity
- 305 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
580 WUUS54 KTSA 041634 RRA SVRTUL OKC001-021-041715- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE TULSA OK 1032 AM CST SAT DEC 4 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA ADAIR COUNTY IN NORTHEAST OKLAHOMA * UNTIL 1115 AM CST * AT 1032 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 6 MILES SOUTHWEST OF COOKSON...MOVING NORTH NORTHEAST AT 40 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...SCRAPER...ELDON...COOKSON...TAHLEQUAH...PROCTOR AND CHRISTIE HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 65 MPH CAN BE EXPECTED IN THE WARNED AREA.
What forecasters said that day
The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Dec 4, 3:45 AM CST, 6 hours 47 minutes earlier.
Area forecast discussion, Dec 4, 3:45 AM CST, 6 hours 47 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 345 AM CST SAT DEC 4 1999 CURRENT MESONET DATA SHOWS A COLD FRONT LOCATED ALONG I-44 WITH A 20 DEGF TEMP DIFF ON EITHER SIDE OF FRONT. ISENTROPIC LIFT ALONG THE FRONT IS THE PRIMARY FORCING MECHANISM FOR SHRA ACTIVITY ALONG AND NORTH OF I-44. WITH TEMPS ALREADY IN THE MID TO UPPER 60S IN THE WARM SECTOR BEFORE SUNRISE...SHOULD BE A WARM MORNING IN SE OK/NW AR. THE SURFACE LOW CURRENLY ANALYZED NEAR KSPS SHOULD MOVE NORTHEAST LATE IN THE MORNING...FINALLY DRAGGING THE FRONT THROUGH SEOK/NWAR WITH A NEAR-CERTAIN CHANCE OF SHRA/TSRA ALONG THE ADVANCING FRONT. A MID-LEVEL DRY SLOT SHOULD WORK IN BEHIND THE FRONT AND QUICKLY LOWER THE RAIN CHANCES IN SEOK/WRN AR FOLLOWING THE FROPA. IN NE OK...ISENTROPIC LIFT SHOULD KEEP RAIN CHANCES GOING MOST OF THE DAY WITH LITTLE TEMP RISE NOTED TODAY. ONCE THE SURFACE LOW PASSES...THE STRONGER SYNOPTIC LIFT EXITS THE AREA...LEAVING MAINLY WRAP-AROUND MOISTURE TO DEAL WITH AND LIMITED MID-LEVEL FORCING ASSOCIATED WITH THE UPPER LOW MOVING ACROSS SRN KS. WILL TAPER POPS FROM NORTH TO SOUTH ON SAT NGT AND SUNDAY MORNING WITH ALL PRECIP CHANCES ENDING BY SUN AFTN. SHOULD BE ENOUGH COLD AIR ASSOCIATED WITH THE UPPER LOW ALONG AND NW OF I-44 FOR SOME SNOWFLAKES TO MIX IN WITH ANY LIGHT PRECIP THAT FALLS ON SUN MRNG. THE ETA FCST SOUNDING FOR PNC AT 12Z SUNDAY SHOWS A FREEZING LEVEL LESS THAN 1000 FT AGL. IN THE EXTENDED...STRONG SUBSIDENCE ON SUN NGT BEHIND THE UPPER LOW WILL KEEP SKIES CLEAR AND ALLOW FOR THE COLDEST NIGHT YET THIS SEASON. AS THE SURFACE RIDGE MOVES EAST ON MON AND TUE...SRLY FLOW AND A WARMUP BEGIN WITH RIDGING ALONG THE GULF COAST KEEPING MOISTURE RETURN NON-EXISTENT. DEVELOPING LOW PRESSURE OVER THE SRN HIGH PLAINS ON WED SHOULD FINALLY DRAW MOISTURE NORTHWARD FROM THE GULF...KEEPING LOW TEMPS WARMER AND LEADING ME TO INTRODUCE SMALL POPS ON WED DUE TO MOISTURE AVAILABILITY AND ISENTROPIC LIFT. LOOKS LIKE MAIN PRECIP EVENT WILL HOLD OFF UNTIL THU WITH THE APPROACH OF THE NEXT FRONT TO ACT AS A FOCUS. FCSTID = 22 TUL 56 39 45 25 / 100 30 20 0 FSM 69 43 48 26 / 100 20 10 0 MLC 72 38 46 25 / 100 20 10 0 BVO 49 34 44 22 / 100 40 30 0 FYV 66 40 44 22 / 100 30 20 0 BYV 66 40 44 22 / 100 30 20 0 MIO 56 39 45 25 / 100 30 20 0 MKO 72 38 46 25 / 100 20 10 0 F10 72 38 46 25 / 100 20 10 0 HHW 75 43 50 28 / 80 10 10 0 .TUL... AR...NONE. OK...NONE.
In the hours before
Special weather statement, Dec 4, 6:05 AM CST, 4 hours 27 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-051200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 605 AM CST SAT DEC 4 1999 ...A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS PARTS OF EASTERN AND NORTHWEST ARKANSAS THIS MORNING AND AFTERNOON... .SYNOPSIS... A STRONG UPPER LEVEL STORM SYSTEM OVER THE TEXAS PANHANDLE EARLY THIS MORNING WILL MOVE INTO NORTHEAST OKLAHOMA BY SUNDAY MORNING. MEANWHILE...A SURFACE LOW ACROSS NORTHWEST TEXAS WILL LIFT NORTHEAST TODAY...AND MOVE INTO NORTHERN ARKANSAS OVERNIGHT. AS THE SURFACE LOW MOVES NORTHEAST...THE COLD FRONT OVER NORTHEAST OKLAHOMA WILL PUSH THROUGH THE REMAINDER OF EASTERN OKLAHOMA THIS AFTERNOON AND NORTHWEST ARKANSAS TONIGHT. .PRIMARY HAZARD... SCATTERED SHOWERS AND THUNDERSTORMS WILL INCREASE IN COVERAGE ACROSS EAST CENTRAL AND SOUTHEAST OKLAHOMA EARLY THIS MORNING...AND THEN MOVE INTO NORTHWEST ARKANSAS BY LATE MORNING. A FEW OF THESE STORMS MAY BECOME SEVERE...WITH WINDS GUSTS TO 60 MPH AND LARGE HAIL UP TO 1 INCH IN DIAMETER POSSIBLE. THE MOST FAVORABLE TIME FRAME FOR SEVERE THUNDERSTORMS WILL BE BETWEEN 6 AM AND NOON FOR EASTERN OKLAHOMA...AND BETWEEN 10 AM AND 4 PM FOR NORTHWEST ARKANSAS. .DISCUSSION... THE ATMOSPHERE OVER SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS REMAINS VERY MOIST AND UNSTABLE THIS MORNING...WITH SURFACE DEWPOINTS GENERALLY IN THE LOWER 60S. THIS MOISTURE...COMBINED WITH INCREASING LIFT AHEAD OF THE UPPER SYSTEM...WILL ALLOW THUNDERSTORMS TO INCREASE OVER MUCH OF SOUTHEAST OKLAHOMA THIS MORNING. STRONG BUT UNIDIRECTIONAL WIND PROFILES SUGGEST THAT THUNDERSTORMS MAY FORM INTO SHORT LINES AND BOW SEGMENTS...WITH DAMAGING STRAIGHT-LINE WINDS BEING THE PRIMARY SEVERE WEATHER THREAT. .SPOTTER ACTIVATION... SPOTTER ACTIVATION MAY BE REQUIRED THIS MORNING AND AFTERNOON OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THE NWS IN TULSA IS ALSO CREATING A GRAPHICAL VERSION OF THE HAZARDOUS WEATHER OUTLOOK WITH SOME ENHANCED TECHNICAL INFORMATION. YOU MAY ACCESS THIS GRAPHICAL HAZARDOUS WEATHER OUTLOOK AT HTTP://WWW.NWSTULSA.NOAA.GOV/HWO.HTML.
Special weather statement, Dec 4, 6:10 AM CST, 4 hours 22 minutes before
ARZ001-002-010-011-019-020-029-OKZ049-053>076-051200- EASTERN OKLAHOMA/NORTHWEST ARKANSAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE TULSA OK 610 AM CST SAT DEC 4 1999 ...A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS PARTS OF EASTERN OKLAHOMA AND NORTHWEST ARKANSAS THIS MORNING AND AFTERNOON... .SYNOPSIS... A STRONG UPPER LEVEL STORM SYSTEM OVER THE TEXAS PANHANDLE EARLY THIS MORNING WILL MOVE INTO NORTHEAST OKLAHOMA BY SUNDAY MORNING. MEANWHILE...A SURFACE LOW ACROSS NORTHWEST TEXAS WILL LIFT NORTHEAST TODAY...AND MOVE INTO NORTHERN ARKANSAS OVERNIGHT. AS THE SURFACE LOW MOVES NORTHEAST...THE COLD FRONT OVER NORTHEAST OKLAHOMA WILL PUSH THROUGH THE REMAINDER OF EASTERN OKLAHOMA THIS AFTERNOON AND NORTHWEST ARKANSAS TONIGHT. .PRIMARY HAZARD... SCATTERED SHOWERS AND THUNDERSTORMS WILL INCREASE IN COVERAGE ACROSS EAST CENTRAL AND SOUTHEAST OKLAHOMA EARLY THIS MORNING...AND THEN MOVE INTO NORTHWEST ARKANSAS BY LATE MORNING. A FEW OF THESE STORMS MAY BECOME SEVERE...WITH WINDS GUSTS TO 60 MPH AND LARGE HAIL UP TO 1 INCH IN DIAMETER POSSIBLE. THE MOST FAVORABLE TIME FRAME FOR SEVERE THUNDERSTORMS WILL BE BETWEEN 6 AM AND NOON FOR EASTERN OKLAHOMA...AND BETWEEN 10 AM AND 4 PM FOR NORTHWEST ARKANSAS. .DISCUSSION... THE ATMOSPHERE OVER SOUTHEAST OKLAHOMA AND NORTHWEST ARKANSAS REMAINS VERY MOIST AND UNSTABLE THIS MORNING...WITH SURFACE DEWPOINTS GENERALLY IN THE LOWER 60S. THIS MOISTURE...COMBINED WITH INCREASING LIFT AHEAD OF THE UPPER SYSTEM...WILL ALLOW THUNDERSTORMS TO INCREASE OVER MUCH OF SOUTHEAST OKLAHOMA THIS MORNING. STRONG BUT UNIDIRECTIONAL WIND PROFILES SUGGEST THAT THUNDERSTORMS MAY FORM INTO SHORT LINES AND BOW SEGMENTS...WITH DAMAGING STRAIGHT-LINE WINDS BEING THE PRIMARY SEVERE WEATHER THREAT. .SPOTTER ACTIVATION... SPOTTER ACTIVATION MAY BE REQUIRED THIS MORNING AND AFTERNOON OVER EASTERN OKLAHOMA AND NORTHWEST ARKANSAS. THE NWS IN TULSA IS ALSO CREATING A GRAPHICAL VERSION OF THE HAZARDOUS WEATHER OUTLOOK WITH SOME ENHANCED TECHNICAL INFORMATION. YOU MAY ACCESS THIS GRAPHICAL HAZARDOUS WEATHER OUTLOOK AT HTTP://WWW.NWSTULSA.NOAA.GOV/HWO.HTML.
The office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 3, 8:00 PM CST | Severe Thunderstorm Warning | TSA | Mayes | 45 min |
| Dec 3, 8:02 PM CST | Severe Thunderstorm Warning | TSA | Delaware | 28 min |
| Dec 3, 8:05 PM CST | Severe Thunderstorm Warning | TSA | Ottawa | 40 min |
| Dec 3, 8:11 PM CST | Severe Thunderstorm Warning | TSA | Delaware | 49 min |
| Dec 3, 8:40 PM CST | Severe Thunderstorm Warning | TSA | Nowata, Rogers | 50 min |
| Dec 3, 8:44 PM CST | Severe Thunderstorm Warning | TSA | Mayes | 61 min |
| Dec 3, 8:44 PM CST | Severe Thunderstorm Warning | TSA | Ottawa | 61 min |
| Dec 3, 8:50 PM CST | Severe Thunderstorm Warning | TSA | Tulsa | 40 min |
| Dec 3, 9:08 PM CST | Severe Thunderstorm Warning | TSA | Craig | 52 min |
| Dec 3, 9:47 PM CST | Severe Thunderstorm Warning | TSA | Ottawa | 43 min |
| Dec 3, 9:54 PM CST | Severe Thunderstorm Warning | TSA | Craig | 51 min |
| Dec 3, 10:04 PM CST | Tornado Warning | TSA | Delaware, Ottawa | 41 min |
| Dec 3, 10:10 PM CST | Severe Thunderstorm Warning | TSA | Okmulgee | 50 min |
| Dec 3, 10:14 PM CST | Severe Thunderstorm Warning | TSA | Creek, Tulsa | 46 min |
| Dec 3, 10:43 PM CST | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 62 min |
| Dec 3, 10:56 PM CST | Severe Thunderstorm Warning | TSA | Rogers, Tulsa | 49 min |
| Dec 3, 11:20 PM CST | Severe Thunderstorm Warning | TSA | Craig | 55 min |
| Dec 3, 11:26 PM CST | Tornado Warning | TSA | Craig, Mayes, Rogers | 34 min |
| Dec 3, 11:29 PM CST | Tornado Warning | TSA | Tulsa, Wagoner | 31 min |
| Dec 3, 11:39 PM CST | Severe Thunderstorm Warning | TSA | Creek | 51 min |
| Dec 3, 11:51 PM CST | Tornado Warning | TSA | Craig | 39 min |
| Dec 3, 11:57 PM CST | Severe Thunderstorm Warning | TSA | Rogers | 48 min |
| Dec 4, 12:11 AM CST | Severe Thunderstorm Warning | TSA | Ottawa | 49 min |
| Dec 4, 12:14 AM CST | Severe Thunderstorm Warning | TSA | Osage, Pawnee | 46 min |
| Dec 4, 8:11 AM CST | Severe Thunderstorm Warning | TSA | Delaware | 49 min |
| Dec 4, 10:18 AM CST | Severe Thunderstorm Warning | TSA | Sequoyah | 42 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 1999Every severe thunderstorm 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.