Alert archive / Oklahoma / Tornado Warnings in 1999

Tornado Warning 67, NWS Tulsa, OK

May 11, 1999Choctaw County, Oklahoma

NWS Tulsa, OK issued this tornado warning at May 11, 1999, 9:11 PM CDT for Choctaw County, Oklahoma. It was in force for 34 min. 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: May 11, 1999, 9:11 PM CDT (02:11 UTC)
Expired: May 11, 1999, 9:45 PM CDT
In force: 34 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Choctaw County, OK

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

Norman, OK (KOUN), launched 00:00Z, 2.2 hours before the alert went out and 206 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: 244 J/kg
Mixed-layer CIN: -246 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 152 m²/s²
0-3 km storm-relative helicity: 272 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

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

999 
WFUS54 KTSA 120213 RRA
TORTUL
OKC023-120245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
911 PM CDT TUE MAY 11 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR
  CHOCTAW COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 945 PM CDT

* AT 911 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG 
ROTATION OVER KENT ALSO A SECOND THUNDERSTORM WITH STRONG ROTATION 
WAS LOCATED 3 MILES SOUTH OF SOPER.  THESE STORMS ARE MOVING 
NORTHEAST AT 10 MPH...THESE DANGEROUS STORMS COULD PRODUCE A TORNADO 
AT ANY TIME.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...  KENT AND
  SOPER

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 3413 9575 3401 9560 3416 9530 3417 9556

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, 5 hours 26 minutes earlier.

Area forecast discussion, May 11, 3:45 PM CDT, 5 hours 26 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, 2 hours 26 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   MAYES

Local storm report, May 11, 7:15 PM CDT, 1 hour 56 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   MAYES

Local storm report, May 11, 7:15 PM CDT, 1 hour 56 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   MAYES

Local storm report, May 11, 7:44 PM CDT, 1 hour 27 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   WAGONER

Local storm report, May 11, 7:44 PM CDT, 1 hour 27 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   WAGONER

Local storm report, May 11, 8:29 PM CDT, 42 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
829 PM CDT TUE MAY 11 1999

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

0810 PM    BLUFF                     OK    .75 INCH HAIL
05/11/99   CHOCTAW

0823 PM    KIOWA                     OK    1.75 INCH HAIL
05/11/99   PITTSBURG

The 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, 7:53 PM CDT	Tornado Warning	TSA	Cherokee, Mayes	52 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, 9:15 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, 1999 Every tornado warning in 1999 Tornadoes 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.