Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 433, NWS Tulsa, OK

August 13, 1999Choctaw County, Pushmataha County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 13, 1999, 5:39 PM CDT for Choctaw County, Pushmataha County, Oklahoma. It was in force for 51 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
Aug 13, 1999, 5:39 PM CDT (22:39 UTC)
Expired
Aug 13, 1999, 6:30 PM CDT
In force
51 min
Issued by
NWS Tulsa, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Choctaw County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 163 km from the middle of the area, began a volume at 22:41 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.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 10.7 hours before the alert went out and 219 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 1999-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 33 joules per kilogram.LCLLFCEL10008507005003002001001 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 1999-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -58 square meters per square second.193958Sfc1 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
33 J/kg
Mixed-layer CIN
-239 J/kg
Mixed-layer LCL
2777 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
-58 m²/s²
0-3 km storm-relative helicity
-24 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 132241 RRA
SVRTUL
OKC023-127-132330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
539 PM CDT FRI AUG 13 1999

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CHOCTAW COUNTY IN SOUTHEAST OKLAHOMA
  SOUTHERN PUSHMATAHA COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 630 PM CDT

* AT 536 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER OLETA...MOVING SOUTHWEST AT 5 MPH.

  A SECOND SEVERE STORM WAS IN NORTHWEST CHOCTAW COUNTY 3 MILES      
  SOUTH OF KENT. THIS STORM WAS MOVING SOUTH AROUND 10 MILES AN HOUR.

* SOME LOCATIONS NEAR THE PATH OF THESE STORMS INCLUDE...OLETA...      
  RATTAN...KENT...MESSER...SOPER...GOODLAND AND HUGO

NICKEL SIZE HAIL HAS ALREADY OCCURRED WITH THE STORM IN SOUTHERN 
PUSHMATAHA COUNTY.

HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 75 MPH CAN BE EXPECTED 
IN THE WARNED AREA.

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

LAT...LON 3417 9522 3430 9538 3404 9574 3387 9553

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 Aug 13, 3:59 PM CDT, 1 hour 40 minutes earlier.

Area forecast discussion, Aug 13, 3:59 PM CDT, 1 hour 40 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
359 PM CDT FRI AUG 13 1999

PROBLEM(S) OF THE DAY:
TEMPERATURES

WILL KEEP SOME SLIGHT CHANCE POPS AHEAD OF FRONT JUST
MOVING INTO S PUSHMATAHA AND CHOCTAW COUNTIES FOR THIS
EVENING. FRONT EXPECTED TO PUSH INTO TX WITH DRIER AIR
PUSHING OVER ALL OF THE AREA. REST OF FCST JUST CONCERNED
WITH TEMPS. DEWPOINTS IN UPPER 50S TO LOWER 60S EXPECTED
TO SPREAD INTO MOST AREAS WITH NE WINDS DECREASING LATER
TONIGHT. NE WINDS REMAIN IN THE AREA SATURDAY WITH TEMPS
COOLER IN FSM/MLC AREA AND ABOUT AS TODAY IN THE NORTH.
UPPER HI BUILDS BACK OVERHEAD SUNDAY AND MONDAY AND RIDGE
REMAINS OVER SOUTHERN PLAINS THROUGH EXTENDED FORECAST.
ECMWF/MRF/NOGAPS DIFFER SLIGHTLY ON TRACK OF A WAVE FCST
TO MOVE ACROSS THE PLAINS WED/THU...SO COULD SEE A FRONT
IN THE AREA BY THEN...BUT FOR NOW WILL LEAVE FCST DRY.
STAYED CLOSE TO FWC TEMPS.

FCSTID = 13
TUL   65  93  67  93 /   0   0   0   0
FSM   67  95  67  97 /   0   0   0   0
MLC   67  95  67  97 /   0   0   0   0
BVO   63  90  65  93 /   0   0   0   0
FYV   60  87  60  90 /   0   0   0   0
BYV   60  87  60  90 /   0   0   0   0
MIO   63  90  65  93 /   0   0   0   0
MKO   65  93  67  93 /   0   0   0   0
F10   65  93  67  93 /   0   0   0   0
HHW   67  95  67  97 /  20   0   0   0

.TUL...
AR...NONE.
OK...NONE.

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

HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS:  NONE
NGM CONFIDENCE:  8 ON A SCALE OF 0 TO 10
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, Aug 13, 3:48 PM CDT, 1 hour 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
348 PM CDT FRI AUG 13 1999

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

0630 PM    RAMONA                    OK    WIND DAMAGE
08/12/99   WASHINGTON                      A FEW TREES AND TREE
                                           LIMBS WERE BLOWN DOWN.

0635 PM    2 NW VERA                 OK    WIND DAMAGE
08/12/99   WASHINGTON                      12-14 DIAMETER TREES
                                           BLOWN DOWN...FRAME
                                           FENCE BLOWN DOWN...ROOF
                                           TILES BLOWN OFF A
                                           HOUSE...B&B SIGN BLOWN
                                           DOWN NEAR JARRETT FARMS
Local storm report, Aug 13, 3:48 PM CDT, 1 hour 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
348 PM CDT FRI AUG 13 1999

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

0630 PM    RAMONA                    OK    WIND DAMAGE
08/12/99   WASHINGTON                      A FEW TREES AND TREE
                                           LIMBS WERE BLOWN DOWN.

0635 PM    2 NW VERA                 OK    WIND DAMAGE
08/12/99   WASHINGTON                      12-14 DIAMETER TREES
                                           BLOWN DOWN...FRAME
                                           FENCE BLOWN DOWN...ROOF
                                           TILES BLOWN OFF A
                                           HOUSE...B&B SIGN BLOWN
                                           DOWN NEAR JARRETT FARMS
Special weather statement, Aug 13, 3:53 PM CDT, 1 hour 46 minutes before
ARZ019-020-029-OKZ049-053-072>076-132100-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
353 PM CDT FRI AUG 13 1999

...EXCESSIVE HEAT ADVISORY HAS EXPIRED...

A COLD FRONT WILL CONTINUE TO BRING COOLER TEMPERATURES INTO
EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT AND SATURDAY...
ENDING THE EXCESSIVE HEAT OVER ALL OF THE AREA.
Special weather statement, Aug 13, 3:53 PM CDT, 1 hour 46 minutes before
ARZ019-020-029-OKZ049-053-072>076-132100-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
353 PM CDT FRI AUG 13 1999

...EXCESSIVE HEAT ADVISORY HAS EXPIRED...

A COLD FRONT WILL CONTINUE TO BRING COOLER TEMPERATURES INTO
EASTERN OKLAHOMA AND NORTHWEST ARKANSAS TONIGHT AND SATURDAY...
ENDING THE EXCESSIVE HEAT OVER ALL OF THE AREA.
Local storm report, Aug 13, 5:35 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
535 PM CDT FRI AUG 13 1999

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

0525 PM    1 E RATTAN                OK    .88 INCH HAIL
08/13/99   PUSHMATAHA
Local storm report, Aug 13, 5:35 PM CDT, 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
535 PM CDT FRI AUG 13 1999

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

0525 PM    1 E RATTAN                OK    .88 INCH HAIL
08/13/99   PUSHMATAHA

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 7:01 PM CDTSevere Thunderstorm WarningTSARogers44 min
Aug 12, 7:39 PM CDTSevere Thunderstorm WarningTSAMayes51 min
Aug 12, 9:08 PM CDTSevere Thunderstorm WarningTSARogers37 min
Aug 13, 4:21 PM CDTSevere Thunderstorm WarningTSAPushmataha39 min
Aug 13, 4:44 PM CDTSevere Thunderstorm WarningTSAChoctaw61 min
Aug 13, 4:52 PM CDTSevere Thunderstorm WarningTSAPushmataha53 min
Aug 13, 6:26 PM CDTSevere Thunderstorm WarningTSAChoctaw19 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; radar from the NEXRAD Level II archive.