Alert archive / Oklahoma / Tornado Warnings in 1999
Tornado Warning 63, NWS Tulsa, OK
NWS Tulsa, OK issued this tornado warning at May 11, 1999, 7:53 PM CDT for Cherokee County, Mayes County, Oklahoma. It was in force for 52 min. 1 report came from 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, with what was reported inside it.
The facts
- Issued
- May 11, 1999, 7:53 PM CDT (00:53 UTC)
- Expired
- May 11, 1999, 8:45 PM CDT
- In force
- 52 min
- Issued by
- NWS Tulsa, OK
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Cherokee County, OK, Mayes County, OK
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 8:20 PM CDT | Thunderstorm Wind 57 | Locust Grove, OK |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 11, 6:15 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.9 hours before the alert went out and 144 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
- 1007 J/kg
- Mixed-layer CIN
- -54 J/kg
- Mixed-layer LCL
- 1168 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 83 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WFUS54 KTSA 120054 RRA TORTUL OKC021-097-120145- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE TULSA OK 753 PM CDT TUE MAY 11 1999 THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A * TORNADO WARNING FOR NORTHERN CHEROKEE COUNTY IN EAST CENTRAL OKLAHOMA SOUTHEASTERN MAYES COUNTY IN NORTHEAST OKLAHOMA * UNTIL 845 PM CDT * AT 753 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG ROTATION 5 MILES SOUTH OF LOCUST GROVE. MOVING EAST AT 15 MPH... THIS DANGEROUS STORM COULD PRODUCE A TORNADO AT ANY TIME. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... SCRAPER AND PEGGS IF YOU ARE IN OR NEAR THE PATH OF THIS STORM...TAKE COVER NOW IF NO UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE SUBSTANTIAL SHELTER. AVOID WINDOWS VERY HEAVY RAIN MAY MAKE THIS TORNADO INVISIBLE - TAKE COVER NOW IF YOU WAIT UNTIL YOU SEE OR HEAR IT COMING IT MAY BE TOO LATE TO GET TO A SAFE PLACE. IN ADDITION TO THE THREAT OF A TORNADO...LARGE HAIL AND DAMAGING STRAIGHT LINE WINDS CAN BE EXPECTED WITH THIS STORM. GO TO A SAFE PLACE NOW LAT...LON 3623 9524 3606 9530 3595 9488 3616 9481
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at May 11, 3:45 PM CDT, 4 hours 8 minutes earlier.
Area forecast discussion, May 11, 3:45 PM CDT, 4 hours 8 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE TULSA OK 345 PM CDT TUE MAY 11 1999 PROBLEM(S) OF THE DAY: WILL THERE BE SEVERE CONVECTION? WILL THERE BE HEAVY RAINFALL? POPS CLOUDS HANGING TOUGH THIS AFTERNOON OVER MUCH OF THE FA...BUT ABUNDANT SUNSHINE PREVAILED OVER FAR ERN OK AND PORTIONS OF NW ARKANSAS. SURFACE FRONT HAS PORGRESSED AT A SNAILS PACE...WITH MID AFTERNOON POSTIONING JUST EAST OF A KANSAS CITY TO OKLAHOMA CITY TO WICHITA FALLS LINE. LOTS OF CLOUDS AND WARM AIR ALOFT HAS KEPT CONVECTION IN CHECK THUS FAR. COULD STILL SEE SOME ACTIVITY FIRE ALONG THE FRONT LATE THIS AFTERNOON...PARTICULARY IN AREAS NORTH AND OF TUL. UPPER TROUGH STILL EXPECTED TO LIFT OUT TONIGHT BRINGING ASSOCIATED S/W ENERGY ACROSS THE AREA. SURFACE FRONT SHOULD PROGRESS EASTWARD IN RESPONSE TO UPPER SYSTEM LIFTING OUT. EXPECT SHOWERS AND STORMS TO FIRE IN VICINITY OF FRONT AS THE COLDER AIR ALOFT WEAKENS THE CAP. ACTIVITY MAY FORM INTO A COMPLEX OF STORMS AS ACTIVITY MOVES ACROSS THE FA TONIGHT AND EARLY TOMORROW MORNING. ETA CONSISTENT WITH PLACING ERN OK IN RIGHT ENTRANCE REGION OF H3 80 KT JET MAX. LOOKS LIKE BEST LIFT WILL BE OVER NE OK AND NW ARKANSAS. THERE COULD ALSO BE SOME HEAVY RAINS WITH SLOW MOVING FRONT. WILL NOT ISSUE FFA AT THIS TIME AS MOST PRECIP IS EXPECTED OVER AREAS WHERE FFG VALUES ARE THE HIGHEST. FRONT EXPECTED TO BE THROUGH NW AR AND SE OK BY 12Z TOMORROW. WILL LEAVE LOW POPS IN FOR MORNING TO COVER LINGERING ACTIVITY. DRIER AIR ADVECTING IN BEHIND THE FRONT SHOULD RESULT IN A PARTLY CLOUDY SKY OVER THE FA TOMORROW AFTERNOON AND NIGHT. STUCK PRETTY CLOSE TO GUIDANCE(NGM MOS AVAILABLE) BUT OPTED FOR COOLER FAN NUMBERS IN LATER PERIODS. IN THE EXTENDED...WILL KEEP DRY AS MOST EXTENDED MODELS ARE CONSISTENT WITH WEAK H5 RIDGING SETTING UP FRI AND SAT. LEE TROUGHING WILL RESULT IN RETURN FLOW AT THE SURFACE BY FRIDAY. UPPER RIDGE SHIFTS OFF TO THE EAST WITH SW FLOW SETTING UP AGAIN SUNDAY. THIS AND A SURFACE DRYLINE/PACIFIC FRONT TO THE WEST OF FA WARRANTS CHANCE POPS FOR SUNDAY. FCSTID = 23 TUL 57 75 56 79 / 60 20 0 0 FSM 59 77 55 80 / 50 30 0 0 MLC 60 78 56 80 / 50 20 0 0 BVO 58 74 53 79 / 60 20 0 0 FYV 57 73 52 78 / 60 30 0 0 IDB 60 80 58 82 / 40 20 0 0 BYV 56 72 51 77 / 60 30 0 0 MIO 58 80 52 77 / 60 30 0 0 MKO 58 76 55 80 / 60 20 0 0 F10 57 75 56 79 / 60 20 0 0 HHW 60 80 58 82 / 40 20 0 0 .TUL... AR...NONE. OK...NONE. -------------------- EXPERIMENTAL OUTPUT: HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: CHANCE SEVERE THUNDERSTORMS NGM CONFIDENCE: MODEL OUTPUT NOT AVAILABLE ETA CONFIDENCE: 7 ON A SCALE OF 0 TO 10 AVN CONFIDENCE: 7 ON A SCALE OF 0 TO 10 FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10
In the hours before
Local storm report, May 11, 6:45 PM CDT, 1 hour 8 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED TIMES
NATIONAL WEATHER SERVICE TULSA OK
645 PM CDT TUE MAY 11 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0640 PM 2 W PRYOR OK 2.75 INCH HAIL
05/11/99 MAYESLocal storm report, May 11, 6:45 PM CDT, 1 hour 8 minutes before
PRELIMINARY LOCAL STORM REPORT...CORRECTED TIMES
NATIONAL WEATHER SERVICE TULSA OK
645 PM CDT TUE MAY 11 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0640 PM 2 W PRYOR OK 2.75 INCH HAIL
05/11/99 MAYESLocal storm report, May 11, 7:15 PM CDT, 38 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
715 PM CDT TUE MAY 11 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0712 PM PRYOR OK .88 INCH HAIL
05/11/99 MAYES
0714 PM CHOUTEAU OK 1.75 INCH HAIL
05/11/99 MAYESLocal storm report, May 11, 7:15 PM CDT, 38 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
715 PM CDT TUE MAY 11 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0712 PM PRYOR OK .88 INCH HAIL
05/11/99 MAYES
0714 PM CHOUTEAU OK 1.75 INCH HAIL
05/11/99 MAYESLocal storm report, May 11, 7:44 PM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
744 PM CDT TUE MAY 11 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0729 PM TULLAHASSEE OK .88 INCH HAIL
05/11/99 WAGONERLocal storm report, May 11, 7:44 PM CDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
744 PM CDT TUE MAY 11 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0729 PM TULLAHASSEE OK .88 INCH HAIL
05/11/99 WAGONERThe office that day
Everything else NWS Tulsa, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 7:23 PM CDT | Flash Flood Warning | TSA | Mayes | 2 hr |
| May 11, 7:27 PM CDT | Severe Thunderstorm Warning | TSA | Wagoner | 48 min |
| May 11, 7:28 PM CDT | Tornado Warning | TSA | Mayes | 32 min |
| May 11, 7:37 PM CDT | Severe Thunderstorm Warning | TSA | Choctaw | 38 min |
| May 11, 7:40 PM CDT | Severe Thunderstorm Warning | TSA | McIntosh | 35 min |
| May 11, 7:46 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 59 min |
| May 11, 7:57 PM CDT | Severe Thunderstorm Warning | TSA | Cherokee, Muskogee | 48 min |
| May 11, 8:15 PM CDT | Severe Thunderstorm Warning | TSA | Choctaw | 30 min |
| May 11, 8:19 PM CDT | Tornado Warning | TSA | Muskogee | 41 min |
| May 11, 8:28 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 47 min |
| May 11, 8:38 PM CDT | Severe Thunderstorm Warning | TSA | Choctaw | 52 min |
| May 11, 8:44 PM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 46 min |
| May 11, 8:45 PM CDT | Tornado Warning | TSA | Cherokee, Muskogee | 45 min |
| May 11, 8:46 PM CDT | Tornado Warning | TSA | Choctaw | 29 min |
| May 11, 9:06 PM CDT | Flash Flood Warning | TSA | Muskogee | 3 hr |
| May 11, 9:07 PM CDT | Flash Flood Warning | TSA | Pittsburg, Pushmataha | 2 hr |
| May 11, 9:07 PM CDT | Flash Flood Warning | TSA | Choctaw | 2 hr |
| May 11, 9:11 PM CDT | Tornado Warning | TSA | Choctaw | 34 min |
| May 11, 9:15 PM CDT | Severe Thunderstorm Warning | TSA | Pittsburg | 45 min |
| May 11, 9:25 PM CDT | Tornado Warning | TSA | Muskogee, Sequoyah | 50 min |
| May 11, 9:26 PM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 49 min |
| May 11, 9:29 PM CDT | Tornado Warning | TSA | Cherokee | 46 min |
| May 11, 9:42 PM CDT | Tornado Warning | TSA | Choctaw | 48 min |
| May 11, 9:54 PM CDT | Severe Thunderstorm Warning | TSA | Rogers, Tulsa | 51 min |
| May 11, 10:09 PM CDT | Tornado Warning | TSA | Sequoyah | 51 min |
| May 11, 10:16 PM CDT | Severe Thunderstorm Warning | TSA | Pushmataha | 44 min |
| May 11, 10:29 PM CDT | Severe Thunderstorm Warning | TSA | Muskogee, Okmulgee, Wagoner | 46 min |
| May 11, 10:29 PM CDT | Severe Thunderstorm Warning | TSA | Choctaw | 46 min |
| May 11, 10:39 PM CDT | Severe Thunderstorm Warning | TSA | Adair, Cherokee | 51 min |
| May 11, 10:46 PM CDT | Severe Thunderstorm Warning | TSA | LeFlore | 29 min |
| May 11, 10:54 PM CDT | Severe Thunderstorm Warning | TSA | Sequoyah | 51 min |
| May 11, 11:10 PM CDT | Flash Flood Warning | TSA | Choctaw, Pushmataha | 110 min |
| May 11, 11:10 PM CDT | Flash Flood Warning | TSA | Pittsburg | 110 min |
| May 12, 12:40 AM CDT | Flash Flood Warning | TSA | Choctaw, Pushmataha | 3 hr |
| May 12, 3:00 AM CDT | Flash Flood Warning | TSA | Cherokee, Muskogee, Wagoner | 3 hr |
Nearby
Tornado Warnings in Oklahoma, 1999Every tornado warning in 1999Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.