Alert archive / Oklahoma / Tornado Warnings in 1998

Tornado Warning 57, NWS Tulsa, OK

September 21, 1998Osage County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Sep 21, 1998, 9:11 PM CDT for Osage County, Oklahoma. It was in force for 34 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: Sep 21, 1998, 9:11 PM CDT (02:11 UTC)
Expired: Sep 21, 1998, 9:45 PM CDT
In force: 34 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), 81 km from the middle of the area, began a volume at 02:12 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Sep 21, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 2.2 hours before the alert went out and 164 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: 562 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 2148 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 277 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 16.1

Open this sounding in Storm Lab

The text

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

288 
WFUS54 KTSA 220214 RRA
TORTUL
OKC113-220245-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
911 PM CDT MON SEP 21 1998

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR
     SOUTHERN OSAGE COUNTY IN NORTHEAST OKLAHOMA

* UNTIL 945 PM CDT

* AT 911 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM WITH STRONG
  ROTATION 15 MILES NORTHWEST OF HOMINY. MOVING SOUTHEAST AT 50 MILES
  PER HOUR...THIS DANGEROUS STORM COULD PRODUCE A TORNADO AT ANY
  TIME.

* SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...  HOMINY

IN ADDITION TO THE THREAT OF A TORNADO...LARGE HAIL AND DAMAGING
STRAIGHT LINE WINDS CAN BE EXPECTED WITH THIS STORM. GO TO A SAFE
PLACE NOW

IF YOU ARE IN OR NEAR THE PATH OF THIS TORNADO...TAKE COVER NOW IF
NO UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR MORE
SUBSTANTIAL SHELTER. AVOID WINDOWS

LAT...LON 3663 9659 3648 9671 3616 9612 3635 9597

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 21, 8:38 PM CDT	Severe Thunderstorm Warning	TSA	Osage	52 min
Sep 21, 8:47 PM CDT	Tornado Warning	TSA	Osage	28 min
Sep 21, 9:01 PM CDT	Severe Thunderstorm Warning	TSA	Creek	44 min
Sep 21, 9:23 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	52 min
Sep 21, 9:35 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Tulsa	40 min

Nearby

Tornado Warnings in Oklahoma, 1998 Every tornado warning in 1998 Tornadoes 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.