Alert archive / Oklahoma / Tornado Warnings in 1999

Tornado Warning 68, NWS Tulsa, OK

May 11, 1999Muskogee County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this tornado warning at May 11, 1999, 9:25 PM CDT for Muskogee County, Sequoyah County, Oklahoma. It was in force for 50 min. 2 reports 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, 9:25 PM CDT (02:25 UTC)
Expired: May 11, 1999, 10:15 PM CDT
In force: 50 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Muskogee County, OK, Sequoyah County, OK

What was reported inside it

Time	Report	Where	Remark
May 11, 9:45 PM CDT	Hail 1.75	Braggs, OK
May 11, 10:00 PM CDT	Hail 0.75	Gore, 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, 2.4 hours before the alert went out and 182 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: 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

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KTUL 120225 RRA
TORTUL
OKC101-135-120315-

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

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN MUSKOGEE COUNTY IN EAST CENTRAL OKLAHOMA
  WESTERN SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 1015 PM CDT

* AT 925 PM CDT STORM SPOTTERS REPORTED AND RADAR INDICATED A        
  TORNADO 3 MILES SOUTHEAST OF BRAGGS...MOVING EAST AT 15 MPH.

* SOME LOCATIONS NEAR THE PATH OF THIS TORNADO INCLUDE...MARBLE      
  CITY...GORE...VIAN AND SALLISAW

IN ADDITION TO THE TORNADO...LARGE HAIL AND DAMAGING STRAIGHT LINE
WINDS CAN BE EXPECTED WITH THIS STORM. GO TO A SAFE PLACE NOW!

IF YOU ARE IN OR NEAR THE PATH OF THIS TORNADO...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!

LAT...LON 3573 9524 3556 9529 3544 9482 3564 9476

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 40 minutes earlier.

Area forecast discussion, May 11, 3:45 PM CDT, 5 hours 40 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, 7:15 PM CDT, 2 hours 10 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, 2 hours 10 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 41 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 41 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, 56 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

Local storm report, May 11, 9:25 PM CDT, 0 minutes before

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

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

0835 PM    1 E MUSKOGEE              OK    1 INCH HAIL
05/11/99   MUSKOGEE

0916 PM    4 S BRAGGS                OK    TORNADO
05/11/99   MUSKOGEE

0918 PM    TAHLEQUAH                 OK    .88 INCH HAIL
05/11/99   CHEROKEE

0920 PM    SOPER                     OK    2 INCH HAIL
05/11/99   CHOCTAW

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, 9:11 PM CDT	Tornado Warning	TSA	Choctaw	34 min
May 11, 9:15 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	45 min
May 11, 9:26 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.