Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 217, NWS Tulsa, OK

May 15, 1998Osage County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at May 15, 1998, 5:31 AM CDT for Osage County, Oklahoma. It was in force for 59 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
May 15, 1998, 5:31 AM CDT (10:31 UTC)
Expired
May 15, 1998, 6:30 AM CDT
In force
59 min
Issued by
NWS Tulsa, OK
Area
Whole counties

County Osage County, OK

The radar

The Tulsa radar (KINX), 90 km from the middle of the area, began a volume at 10:32 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
May 15, 6:35 AM CDTHail 0.75Fairfax, OK
May 15, 6:35 AM CDTThunderstorm Wind 52Fairfax, 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 nearest sounding before it

Lamont, OK (KLMN), launched 00:00Z, 10.5 hours before the alert went out and 97 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, Lamont, OK at 00:00Z on 1998-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2973 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, Lamont, OK at 00:00Z on 1998-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
2973 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
1042 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
2.0
Supercell composite
8.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

111 
WUUS54 KTSA 151032 RRA
SVRTUL
OKC113-151130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
531 AM CDT FRI MAY 15 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...

  WESTERN OSAGE COUNTY IN NORTHEASTERN OKLAHOMA

* UNTIL 630 AM CDT

* AT 528 AM... DOPPLER RADAR DETECTED A LINE OF SEVERE THUNDERSTORMS
  FROM TONKAWA TO RED ROCK. DAMAGING WIND GUSTS TO AROUND 70 MPH
  WILL OCCUR WITH MANY OF THESE STORMS AS THEY MOVE NORTH NORTHEAST
  AT 45 MPH.

* THE FOLLOWING LOCATIONS ARE NEAR THE PATH OF THESE STORMS...
  RURAL AREAS BETWEEN PONCA CITY AND BURBANK



IF YOU ARE IN THE PATH OF THESE STORMS SEEK SHELTER NOW. GO TO THE
LOWEST FLOOR OF YOUR HOME OR BUSINESS. AVOID OUTSIDE WALLS AND
WINDOWS. MOBILE HOMES SHOULD BE ABANDONED FOR A MORE SUBSTANTIAL
SHELTER IF ONE IS NEARBY.

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 May 15, 3:50 AM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, May 15, 3:50 AM CDT, 1 hour 41 minutes before
FPUS3 KTUL 150851
AFDTUL

EASTERN OKLAHOMA/NORTHWEST ARKANSAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TULSA OK
350 AM CDT FRI MAY 15 1998

VIGOROUS SHORWAVE TO MOVE TO OUR WEST AND NORTH TODAY.  SHORTWAVE HAS
HELPED TO TRIGGER A LINE OF THUNDERSTORMS ALONG DRY LINE/PACIFIC COLD
FRONT IN THE TEXAS PANHANDLE AND WESTERN OKLAHOMA THIS MORNING.
EXPECT STORMS TO CONTINUE TO MOVE EAST NORTHEAST AND EVENTUALLY
EFFECT THE FORECAST AREA.  HAVE GONE LIKELY POPS NORHEAST OKLAHOMA
AND NORTHWEST ARKANSAS AND GOOD CHANCE POPS FOR AREAS TO THE SOUTH.
MAIN CHANCE FOR RAIN TO BE THIS MORNING...BUT WILL NOT GET CUTE WITH
WORDING AS DRY LINE/PACIFIC COLD FRONT TO MAKE ITS WAY ACROSS THE
AREA LATER TODAY AND COULD TRIGGER ADDITIONAL SHOWERS AND
THUNDERSTORMS.  HAVE KEPT SLIGHT CHANCE POPS IN FOR THE EASTERN ZONES
THIS EVENING FOR THIS REASON AS WELL.

TEMPERATURE WISE HAVE BASICALLY FOLLOWED THE FWC NUMBERS WITH ONLY A
FEW SLIGHT VARIATIONS.  TONIGHT TO BE COOLER THAN THIS MORNING DUE TO
LOWER DEW POINTS AND LESS WIND...BUT HIGHS SHOULD STAY IN THE 80S AS
COOLING BEHIND FRONT IS NOT SIGNIFICANT.

LOOKING AHEAD IT APPEARS THE REMAINDER OF THE FORECAST PERIOD WILL BE
QUIET AND WARM AS AN UPPER RIDGE BUILDS OVER THE AREA AND REMAINS IN
PLACE.

FCSTID = 17
TUL   87  60  88  65 /  60  10   0   0
FSM   87  60  88  59 /  50  20   0   0
MLC   87  62  89  63 /  50  10   0   0
BVO   86  58  87  63 /  60  10   0   0
FYV   85  57  85  56 /  60  20   0   0
IDB   87  61  89  62 /  40  20   0   0
BYV   84  56  84  55 /  60  20   0   0
MIO   86  58  86  60 /  60  10   0   0
MKO   87  60  88  65 /  60  10   0   0
F10   87  61  88  64 /  60  10   0   0
HHW   87  62  89  63 /  40  20   0   0

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

ABBAS

The office that day

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

IssuedProductOfficeCountiesLasted
May 15, 5:50 AM CDTSevere Thunderstorm WarningTSAPawnee55 min
May 15, 6:23 AM CDTSevere Thunderstorm WarningTSAOsage52 min
May 15, 6:23 AM CDTSevere Thunderstorm WarningTSAOsage67 min
May 15, 7:38 AM CDTSevere Thunderstorm WarningTSAOsage, Washington37 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.