Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 140, NWS Tulsa, OK

April 26, 1998LeFlore County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 26, 1998, 10:30 PM CDT for LeFlore County, Oklahoma. It was in force for 30 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
Apr 26, 1998, 10:30 PM CDT (03:30 UTC)
Expired
Apr 26, 1998, 11:00 PM CDT
In force
30 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 03:34 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
Apr 26, 10:50 PM CDTThunderstorm WindZafra, OKSeveral trees and large tree limbs blown down

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 00:00Z, 3.5 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 00:00Z on 1998-04-27Temperature 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, Springfield, MO at 00:00Z on 1998-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
939 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
226 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.

478 
WUUS54 KTSA 270331 RRA
SVRTUL
OKC079-270400-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
1030 PM CDT SUN APR 26 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  SOUTHERN LE FLORE COUNTY - SOUTHEASTERN OKLAHOMA

* UNTIL 1100 PM CDT

* AT 1026 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED A LINE
  OF SEVERE THUNDERSTORMS FROM SUMMERFIELD TO MUSE...MOVING EAST-
  NORTHEAST AT 45 MPH.

* SOME LOCATIONS AFFECTED INCLUDE...
  HEAVENER
  PAGE
  BIG CEDAR

  WIND GUSTS TO 70 MPH CAN BE EXPECTED IN THE WARNED AREA.

BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS AS STORMS APPROACH.

WHEN THUNDERSTORMS APPROACH...TAKE COVER INSIDE A STURDY BUILDING.
STAY AWAY FROM WINDOWS. TO PROTECT YOURSELF FROM LIGHTNING STAY OFF
THE PHONE AND DONT USE HAND HELD ELECTRICAL APPLIANCES. MOTORISTS
SHOULD NEVER DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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 Apr 26, 9:25 PM CDT, 1 hour 5 minutes earlier.

Area forecast discussion, Apr 26, 9:25 PM CDT, 1 hour 5 minutes before
EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
925 PM CDT SUN APR 26 1998

KINX AND KSRX 88DS INDICATING TSRA MOVING NORTH ACROSS FA ATTM.
SQUALL LINE MOVING ACROS SOUTHERN PTN OF FA WITH STRONG WINDS.
HEAVIEST RAINS SETTING UP JUST WEST OF FA NOW.  LATEST FFG VALUES IN
THE 2 TO 3 INCH RANGE FOR 3H.  MAIN FLOODING CONCERNS ARE FOR AREAS
ACROSS NORTHERN FA THAT RECEIVED PCPN THIS MORN WHERE GUIDANCE
VALUES ARE A TOUCH LOWER.  WILL MONITOR PRECIP AMOUNTS FOR POSSIBLE
FFA ISSUANCE.  OTHERWISE...CURRENT FCST IS HANDLING EVENT VERY
NICELY AND AM NOT PLANNING AN UPDATE ATTM.

HOWIESON
FCSTID = 44

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

r

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 8:33 PM CDTSevere Thunderstorm WarningTSAChoctaw, Pushmataha72 min
Apr 26, 9:25 PM CDTSevere Thunderstorm WarningTSALatimer, Pittsburg50 min
Apr 26, 9:42 PM CDTSevere Thunderstorm WarningTSALeFlore, Pushmataha48 min
Apr 26, 9:46 PM CDTSevere Thunderstorm WarningTSAHaskell, Pittsburg44 min
Apr 27, 5:29 AM CDTFlash Flood WarningTSACreek, Osage, Pawnee, Tulsa2 hr
Apr 27, 7:35 AM CDTFlash Flood WarningTSACreek, Osage, Pawnee, Tulsa3 hr

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.