Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 413, NWS Tulsa, OK

August 19, 1998LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 19, 1998, 5:39 PM CDT for LeFlore County, Oklahoma. It was in force for 51 min. 1 report 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
Aug 19, 1998, 5:39 PM CDT (22:39 UTC)
Expired
Aug 19, 1998, 6:30 PM CDT
In force
51 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 53 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.

What was reported inside it

TimeReportWhereRemark
Aug 19, 5:45 PM CDTThunderstorm Wind 61Heavener, OK65 to 70 mph winds knocked down two large trees on the west side of town. Hail of one-quarter to one-half inch in diameter was also reported.

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 nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 10.7 hours before the alert went out and 237 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, Springfield, MO at 12:00Z on 1998-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1103 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, Springfield, MO at 12:00Z on 1998-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.1939Sfc1 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
1103 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
1601 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
28 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 192239 RRA
SVRTUL
OKC079-192330-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
539 PM CDT WED AUG 19 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  LE FLORE COUNTY IN SOUTHEASTERN OKLAHOMA

* UNTIL 630 PM CDT

* AT 540 PM...RADAR DETECTED A SEVERE THUNDERSTORM NEAR HEAVENER...
  MOVING WEST AT 5 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...
  HEAVENER
 B HOWE

  HAIL TO THE SIZE OF QUARTERS AND WIND GUSTS TO 60 MPH CAN BE
  EXPECTED IN THE WARNED AREA.

BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

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 19, 4:00 PM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, Aug 19, 4:00 PM CDT, 1 hour 39 minutes before
FPUS3 KTUL 192058
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
400 PM CDT WED AUG 19 1998

WIDELY SCATTERED THUNDERSTORMS HAVE FORMED GENERALLY ACROSS THE
NORTHERN HALF OF THE FORECAST AREA. MEANWHILE THE USUAL ISOLATED
SHOWERS AND THUNDERSTORMS ARE BEGINNING TO DEVELOP AS WELL ACROSS
SOUTHERN SECTIONS. LOOKS LIKE ACTIVITY COULD LAST INTO THE EVENING AS
OUTFLOW BOUNDARIES HELP TRIGGER ADDITIONAL STORMS BUT OVERALL SHOULD
SEE A DIMINISHING TREND AS THE SUN SETS. WILL HAVE A HIGHER CHANCE OF
RAIN MENTIONED IN THE ZONE FORECASTS SINCE THE OFFICIAL PROBABILITY
OF PRECIPITATION DOES NOT BEGIN UNTIL 00 UNIVERSAL COORDINATED TIME
AT WHICH TIME BELIEVE COVERAGE SHOULD BE MUCH LESS.

MODELS ARE SUGGESTING THAT SOME MID LEVEL SHOWERS AND THUNDERSTORMS
COULD DEVELOP ACROSS CENTRAL AND/OR WESTERN OKLAHOMA LATE TONIGHT. AT
THIS TIME BELIEVE IF THIS OCCURS IT SHOULD STAY WEST OF THE FORECAST
AREA.

BY TOMORROW IT SHOULD BE BACK TO JUST ISOLATED ACTIVITY IN THE HIGHER
TERRAIN IN EASTERN AND SOUTHERN AREAS. ALTHOUGH IF HIGHER MID LEVEL
TEMPERATURES VERIFY ALL AREAS COULD BE DRY.

WILL GO AHEAD AND PUT IN A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS
FOR BOTH SATURDAY AND SUNDAY AS MEDIUM RANGE MODELS ARE IN FAIR
AGREEMENT IN SHOWING A DISTURBANCE MOVING ACROSS THE AREA AS THE
UPPER RIDGE RETREATS TO THE WEST.

TUL   73  95  72  93 /  10  10   0   0
FSM   73  95  70  94 /  10  10  10  10
MLC   72  97  70  95 /  10  10   0   0
BVO   71  96  70  94 /  10  10   0   0
FYV   68  93  67  91 /  10  10  10  10
IDB   71  96  71  94 /  10  10  10  10
BYV   67  92  66  91 /  10  10  10  10
MIO   71  94  69  92 /  10   0   0   0
MKO   72  95  70  93 /  10  10   0   0
F10   71  96  71  94 /  10  10   0   0
HHW   73  97  72  95 /  10  10  10  10

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

In the hours before

Local storm report, Aug 19, 4:52 PM CDT, 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
452 PM CDT WED AUG 19 1998

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

0340 PM    4 S LOCUST GROVE          OK   .88 INCH HAIL
08/19/98   MAYES

0435 PM    5 W JAY                   OK   70 MPH TSTM GUST
08/19/98   DELAWARE                       WIND GUST TO 70 MPH
                                          REPORTED BY PUBLIC.
Local storm report, Aug 19, 4:52 PM CDT, 47 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
452 PM CDT WED AUG 19 1998

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

0340 PM    4 S LOCUST GROVE          OK   .88 INCH HAIL
08/19/98   MAYES

0435 PM    5 W JAY                   OK   70 MPH TSTM GUST
08/19/98   DELAWARE                       WIND GUST TO 70 MPH
                                          REPORTED BY PUBLIC.
Local storm report, Aug 19, 5:10 PM CDT, 29 minutes before
PRELIMINARY LOCAL STORM REPORT ...DELAYED REPORTS FROM 8/18/98...
NATIONAL WEATHER SERVICE TULSA OK
510 PM CDT WED AUG 19 1998

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

0505 PM    WAR EAGLE                 AR   1.00 INCH HAIL
08/18/98   BENTON                         AT WAR EAGLE MILL

0505 PM    WAR EAGLE                 AR   WIND DAMAGE
08/18/98   BENTON                         SEVERAL LARGE TREES
                                          BLOWN DOWN NEAR WAR
                                          EAGLE MILL
Local storm report, Aug 19, 5:31 PM CDT, 8 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TULSA OK
531 PM CDT WED AUG 19 1998

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

0528 PM    BROKEN ARROW              OK   .75 INCH HAIL
08/19/98   TULSA                          DIME SIZE HAIL REPORTED IN
                                          NORTH BROKEN ARROW. REPORT
                                          FROM SPOTTER.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 3:27 PM CDTSevere Thunderstorm WarningTSAMayes48 min
Aug 19, 4:26 PM CDTSevere Thunderstorm WarningTSAWagoner64 min
Aug 19, 5:24 PM CDTSevere Thunderstorm WarningTSATulsa51 min
Aug 19, 6:11 PM CDTSevere Thunderstorm WarningTSAPittsburg49 min
Aug 19, 6:29 PM CDTSevere Thunderstorm WarningTSAWashington46 min
Aug 19, 6:39 PM CDTSevere Thunderstorm WarningTSALatimer, Pushmataha51 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998Every severe thunderstorm warning in 1998

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.