Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 419, NWS Tulsa, OK

August 26, 1998Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Aug 26, 1998, 4:02 PM CDT for Osage County, Oklahoma. It was in force for 43 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 26, 1998, 4:02 PM CDT (21:02 UTC)
Expired
Aug 26, 1998, 4:45 PM CDT
In force
43 min
Issued by
NWS Tulsa, OK
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Osage County, OK

The radar

The Tulsa radar (KINX), 59 km from the middle of the area, began a volume at 21:06 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.

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 9.0 hours before the alert went out and 175 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 1998-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 69 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 1998-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -45 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
69 J/kg
Mixed-layer CIN
-140 J/kg
Mixed-layer LCL
1985 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-45 m²/s²
0-3 km storm-relative helicity
-13 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.

589 
WUUS54 KTSA 262105 RRA
SVRTUL
OKC113-262145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
402 PM CDT WED AUG 26 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
     SOUTHEASTERN OSAGE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 445 PM CDT

* AT 402 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 9 MILES
  SOUTHWEST OF AVANT...MOVING NORTHEAST AT 5 MILES PER HOUR.

* SOME LOCATIONS AFFECTED INCLUDE...  WOLCO AND AVANT

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

BE ALERT FOR RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

LAT...LON 3638 9626 3632 9617 3639 9601 3665 9604

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 26, 3:38 PM CDT, 24 minutes earlier.

Area forecast discussion, Aug 26, 3:38 PM CDT, 24 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
338 PM CDT WED AUG 26 1998

PROBLEM(S) OF THE DAY:
SCT CONVECTION THIS EVENING ALG KS/MO BORDERS
POPS THRU ALL PDS

IN THE SHORT TERM...MAIN PROBLEMS IN FIRST PD DEAL WITH MESOSCALE
TRENDS WITH SCT STORMS THAT HAVE DEVELOPED ACRS THE NRN FCST AREA.
WHILE THERE REMAINS SOME MIDLVL DRY AIR TO CONTEND WITH ON ANY STORMS
THAT CAN GET THE CORES HIGH ENOUGH...ANYTHING STRONG THAT DEVELOPS
SHOULD REMAIN ISOLD WITH MOST STORMS JUST DUMPING LOCALLY HEAVY RAINS
(NOT OVERLY DIFFERENT THAN YOUR TYPICAL SUMMER PATTERN).  BETTER WIND
PROFILES ARE IN FACT N OF THE BORDER WHERE STORMS TEND TO LINGER A
BIT LONGER...SO NO WIDESPREAD SGFNT PROBLEMS FORSEEN WITH THESE
STORMS ACRS OUR FCST AREA ATTM.  WIND FIELDS VERY WEAK FM MLC-FSM
CLOSER TO UPR RIDGE.

SHORT RANGE MODELS NOW SHOWING A BROADSCALE PATTERN SHIFT AND SUPPORT
THE ECMWF/MRF CONTENTION OF THE UPR RIDGE SHIFTING EAST AND TROF
DEEPENING IN THE ERN STATES (PUTTING US IN A NWLY FLOW ALOFT BY 12Z
FRI).  THRU THU...WE LOOK FOR MAIN SHORTWAVE ENERGY TO CONT
TRANSLATING JUST N OF FCST AREA (JUST GRAZING US) AS RIDGE SHIFTS
ACRS SRN ZONES.  POPS WL BE TRENDED ON THE LOW SIDE WITH MOST
CONVECTION FIRING NR EXPECTED OUTFLOW BNDRYS ACRS NRN FCST ZONES.

AS UPR FLOW SHIFTS MORE NWLY BY FRI...EXPECT PASSING SHORTWAVES TO
DRIVE FNTL BNDRY INTO ERN OK/WRN AR FRI.  WHILE MODELS ARE NOT OVERLY
IMPRESSIVE WITH MSTR NR BNDRY...WL CONT TO ADVERTISE AT LEAST A CHC
OF RAIN FRI INTO SAT AS BNDRY SLOWLY SLIPS SWD.  BY SUN AND
MON...WHILE SFC BNDRY SHOULD BE S OF RED RIVER...WL CARRY SOME SLIGHT
MENTION OF RAIN AS NWLY FLOW ALOFT SHOULD PERSIST AND MOST FORCING WL
BE MIDLVL IN NATURE.

FCSTID = 14

PRELIM NUMBERS...
TUL   74 102  75  96 /  20  10   5  30
FSM   76 102  75  95 /  10  10   5  20
MLC   75 102  75  97 /  10  10   5  20
BVO   74 100  75  93 /  30  20  20  40
FYV   69  98  70  93 /  20  10   5  30
IDB   73 102  75  98 /  10  10   5  10
BYV   69  98  70  93 /  20  10   5  30
MIO   72  98  73  93 /  30  20  20  40
MKO   74 102  75  96 /  20  10   5  30
F10   74 102  75  96 /  20  10   5  30
HHW   73 102  75  98 /  10  10   5  10

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

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

GENERAL WEATHER EXPECTED NEXT 24 HOURS: CONVECTIVE PRECIP
HAZARDOUS WEATHER EXPECTED NEXT 24 HOURS:  WK POTNL OF ISOLD SVR
CELLS ALG KS BORDER COUNTIES OF OK THRU 02Z
NGM CONFIDENCE:  7 ON A SCALE OF 0 TO 10
ETA CONFIDENCE:  7 ON A SCALE OF 0 TO 10
AVN CONFIDENCE:  5 ON A SCALE OF 0 TO 10
FCST CONFIDENCE: 8 ON A SCALE OF 0 TO 10

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.