Alert archive / Oklahoma / Tornado Warnings in 1999

Tornado Warning 90, NWS Tulsa, OK

September 10, 1999Okfuskee County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Sep 10, 1999, 6:04 PM CDT for Okfuskee County, Oklahoma. It was in force for 26 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Sep 10, 1999, 6:04 PM CDT (23:04 UTC)
Expired
Sep 10, 1999, 6:30 PM CDT
In force
26 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County Okfuskee County, OK

The radar

The Norman radar (KTLX), 88 km from the middle of the area, began a volume at 23:06 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.

What was reported inside it

TimeReportWhereRemark
Sep 10, 6:10 PM CDTThunderstorm WindPaden, OKTrees were blown down north of Paden.
Sep 10, 6:30 PM CDTHail 1Welty, 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.

IssuedProductOfficeLasted
Sep 10, 3:00 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.1 hours before the alert went out and 101 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-pSkew-T log-p diagram, Norman, OK at 12:00Z on 1999-09-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 1999-09-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2357 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
240 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 102304 RRA
TORTUL
OKC107-102330-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
604 PM CDT FRI SEP 10 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR
  WESTERN OKFUSKEE COUNTY IN EAST CENTRAL OKLAHOMA

* UNTIL 630 PM CDT

* AT 601 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG
  ROTATION 6 MILES NORTHWEST OF PADEN. MOVING EAST AT 20 MPH...THIS
  DANGEROUS STORM COULD PRODUCE A TORNADO AT ANY TIME.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...  WELTY.  

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 356`8 9663 3546 9664 3544 9642 3564 9639

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 Sep 10, 3:30 PM CDT, 2 hours 34 minutes earlier.

Area forecast discussion, Sep 10, 3:30 PM CDT, 2 hours 34 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
330 PM CDT FRI SEP 10 1999

PROBLEM(S) OF THE DAY:
WILL THE CONVECTION BE SCATTERED OR NUMEROUS?
HOW MUCH RAIN WILL FALL?

DESPITE MOVING INTO A DRIER AIR MASS...AREA OF THUNDERSTORMS THIS
MORNING PERSISTED AND REMAINED STRONG INTO THE AFTERNOON.  IT HAS
LEFT A WELL-DEFINED OUTFLOW BOUNDARY WHICH EXTENDS BACK INTO NORTH
CENTRAL OKLAHOMA.  MODELS INDICATE AN UPPER LEVEL DISTURBANCE MOVING
INTO WESTERN KANSAS WHICH WILL ACTIVATE A NEW ROUND OF STORMS WITHIN
THE WATCH AREA THIS EVENING.  WOULD GUESS THAT ACTIVITY IN WESTERN
PORTIONS OF WATCH AREA THIS EVENING WILL SPREAD INTO EASTERN OKLAHOMA
LATER TONIGHT.  IN THE MEANTIME...ATMOSPHERE OVER EASTERN PORTIONS OF
WATCH AREA WILL RE-DESTABILIZE LATER TONIGHT AS DEEPER LOW LEVEL
MOISTURE WILL INCREASE RAPIDLY TONIGHT.

AFTER THE ROUND OF THUNDERSTORMS OVERNIGHT...EXPECT A TEMPORARY BREAK
EARLY SATURDAY.  THEN IT MAY BE A MATTER OF FINDING THE BOUNDARIES
LEFT OVER FROM THE LATE NIGHT CONVECTION.  AFTER THAT...THE NEXT
PROBLEM WILL BE TIMING A STRONG COLD FRONT AS IT MOVES SOUTHEASTWARD
INTO FORECAST AREA.  LOOKS LIKE FRONT WILL ENTER INTO AREA DURING THE
DAY SUNDAY.  WILL BRING BACK A CHANCE OF THUNDERSTORMS LATE SATURDAY
NIGHT AND CONTINUE IT INTO SUNDAY.  ETA IS THE STRONGEST MODEL WITH
THE COLD FRONT AND WILL LEAN TOWARDS IT.

EXTENDED FORECAST LOOKS DRY AND COOL.

FCSTID = 11
TUL   65  88  67  85 /  50  30  20  40
FSM   63  90  67  87 /  30  40  30  30
MLC   65  90  66  87 /  30  40  30  30
BVO   63  87  65  84 /  60  30  20  40
FYV   60  86  62  84 /  30  40  20  30
BYV   60  86  62  84 /  30  40  20  30
MIO   63  87  65  84 /  60  30  20  40
MKO   65  88  67  85 /  50  30  20  40
F10   65  88  67  85 /  50  30  20  40
HHW   65  90  66  87 /  30  40  30  30

.TUL...
AR...NONE.
OK...SEVERE THUNDERSTORM WARNING UNTIL 342 PM CDT FridAy FOR ZONES
OKZ070...OKZ067...OKZ066.

SEVERE THUNDERSTORM WATCH UNTIL 900 PM CDT FridAy FOR ZONES
OKZ054>072...OKZ074...OKZ076.

--------------------
EXPERIMENTAL OUTPUT:

HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS: GOOD CHANCE SEVERE
THUNDERSTORMS
NGM CONFIDENCE:  6 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  8 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  7 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 7 ON A SCALE OF 0 TO 10

In the hours before

Local storm report, Sep 10, 4:07 PM CDT, 1 hour 57 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
407 PM CDT FRI SEP 10 1999

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

0403 PM  l  CHECOTAH                  OK    .75 INCH HAIL
09/10/99   MCINTOSH
Local storm report, Sep 10, 4:07 PM CDT, 1 hour 57 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
407 PM CDT FRI SEP 10 1999

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

0403 PM  l  CHECOTAH                  OK    .75 INCH HAIL
09/10/99   MCINTOSH
Local storm report, Sep 10, 4:37 PM CDT, 1 hour 27 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
437 PM CDT FRI SEP 10 1999

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

0403 PM    CHECOTAH                  OK    .75 INCH HAIL
09/10/99   MCINTOSH

0415 PM    5 S CHECOTAH              OK    .75 INCH HAIL
09/10/99   MCINTOSH

0420 PM    7 SW CHECOTAH             OK    .75 INCH HAIL
09/10/99   MCINTOSH
Local storm report, Sep 10, 4:41 PM CDT, 1 hour 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
441 PM CDT FRI SEP 10 1999

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

0438 PM    STIGLER                   OK    60 MPH TSTM GUST
09/10/99   HASKELL                         ESTIMATED GUST FROM
                                           SHERIFFS OFFICE
Local storm report, Sep 10, 4:41 PM CDT, 1 hour 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
441 PM CDT FRI SEP 10 1999

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

0438 PM    STIGLER                   OK    60 MPH TSTM GUST
09/10/99   HASKELL                         ESTIMATED GUST FROM
                                           SHERIFFS OFFICE
Local storm report, Sep 10, 5:00 PM CDT, 1 hour 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
500 PM CDT FRI SEP 10 1999

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

0430 PM    6 W MARAMEC               OK    60 MPH TSTM GUST
09/10/99   PAWNEE                          ESTIMATED GUST FROM
                                           PUBLIC AT REST STOP ON
                                           CIMARRON TURNPIKE

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 10, 1:54 PM CDTSevere Thunderstorm WarningTSATulsa36 min
Sep 10, 2:13 PM CDTSevere Thunderstorm WarningTSAMuskogee, Wagoner47 min
Sep 10, 2:57 PM CDTSevere Thunderstorm WarningTSAMuskogee, Okmulgee, Wagoner48 min
Sep 10, 3:21 PM CDTSevere Thunderstorm WarningTSAMcIntosh54 min
Sep 10, 3:45 PM CDTSevere Thunderstorm WarningTSAMcIntosh, Muskogee45 min
Sep 10, 3:59 PM CDTSevere Thunderstorm WarningTSAHaskell, Sequoyah61 min
Sep 10, 4:09 PM CDTSevere Thunderstorm WarningTSATulsa36 min
Sep 10, 4:11 PM CDTSevere Thunderstorm WarningTSAPittsburg49 min
Sep 10, 4:19 PM CDTSevere Thunderstorm WarningTSAPawnee41 min
Sep 10, 4:45 PM CDTSevere Thunderstorm WarningTSALatimer, LeFlore60 min
Sep 10, 4:50 PM CDTSevere Thunderstorm WarningTSACreek40 min
Sep 10, 4:55 PM CDTSevere Thunderstorm WarningTSAHaskell35 min
Sep 10, 5:29 PM CDTSevere Thunderstorm WarningTSALeFlore46 min
Sep 10, 5:29 PM CDTSevere Thunderstorm WarningTSACreek46 min
Sep 10, 6:10 PM CDTSevere Thunderstorm WarningTSACreek50 min
Sep 10, 6:27 PM CDTTornado WarningTSAOkfuskee33 min
Sep 10, 6:39 PM CDTTornado WarningTSAOkfuskee36 min

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; radar from the NEXRAD Level II archive.