Alert archive / Oklahoma / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 430, NWS Tulsa, OK

September 30, 1998Creek County, Okmulgee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Sep 30, 1998, 5:00 PM CDT for Creek County, Okmulgee County, Oklahoma. It was in force for 45 min. 4 reports came from 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, with what was reported inside it.

The facts

Issued: Sep 30, 1998, 5:00 PM CDT (22:00 UTC)
Expired: Sep 30, 1998, 5:45 PM CDT
In force: 45 min
Issued by: NWS Tulsa, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Creek County, OK, Okmulgee County, OK

The radar

The Tulsa radar (KINX), 73 km from the middle of the area, began a volume at 22:02 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

Time	Report	Where	Remark
Sep 30, 5:10 PM CDT	Hail 2	Slick, OK	2-inch hail accompanied by 50 to 60 mph winds.
Sep 30, 5:23 PM CDT	Thunderstorm Wind 61	Slick, OK
Sep 30, 5:26 PM CDT	Hail 1	Edna, OK
Sep 30, 5:54 PM CDT	Thunderstorm Wind 52	Okmulgee, 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

Norman, OK (KOUN), launched 12:00Z, 10.0 hours before the alert went out and 124 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2041 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: -3 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 302200 RRA
SVRTUL
OKC037-111-302245-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TULSA OK
500 PM CDT WED SEP 30 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR
     CREEK COUNTY IN NORTHEAST OKLAHOMA
     OKMULGEE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 545 PM CDT

* AT 459 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 2 MILES WEST OF
  SLICK...MOVING EAST AT 15 MILES PER HOUR.

* SOME LOCATIONS AFFECTED INCLUDE...  SLICK...BEGGS...PRESTON AND
  OKMULGEE

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

LAT...LON 3586 9635 3567 9641 3561 9592 3586 9600

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 30, 5:43 PM CDT	Severe Thunderstorm Warning	TSA	Okmulgee	47 min
Sep 30, 6:56 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee	34 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 1998 Every 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.