Alert archive / Oklahoma / Tornado Warnings in 1998

Tornado Warning 2, NWS Norman, OK

April 6, 1998Cotton County, Tillman County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 6, 1998, 6:54 PM CDT for Cotton County, Tillman County, Oklahoma. It was in force for 66 min. 2 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: Apr 6, 1998, 6:54 PM CDT (23:54 UTC)
Expired: Apr 6, 1998, 8:00 PM CDT
In force: 66 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Cotton County, OK, Tillman County, OK

What was reported inside it

Time	Report	Where	Remark
Apr 6, 7:00 PM CDT	Hail 1	Grandfield, OK
Apr 6, 7:10 PM CDT	Hail 0.88	Devol, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 6, 2:00 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Fort Sill, OK (KFSI), launched 12:00Z, 11.9 hours before the alert went out and 45 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: 42 J/kg
Mixed-layer CIN: -271 J/kg
Mixed-layer LCL: 1039 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 206 m²/s²
0-3 km storm-relative helicity: 168 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.

293 
WFUS1 KOKC 062358 RRA
TOROKC
OKC033-141-070100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
654 PM CDT MON APR 6 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING EFFECTIVE
UNTIL 800 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES

IN SOUTHWEST OKLAHOMA
     COTTON AND EASTERN TILLMAN

INCLUDING THE FOLLOWING LOCATIONS
     WALTERS...TEMPLE...COOKIETOWN...GRANDFIELD...RANDLETT...DEVOL
     AND TAYLOR

AT 649 PM CDT DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING A TORNADO. THE MOST DANGEROUS PORTION OF THE STORM WAS
LOCATED 3 MILES EAST OF GRANDFIELD.

THE STORM WAS MOVING EAST NORTHEAST AT 35 MILES PER HOUR.

IN ADDITION TO POSSIBLY PRODUCING A TORNADO... THE THUNDERSTORM WILL 
LIKELY PRODUCE WINDS IN EXCESS OF 60 MPH AND LARGE HAIL.

TAKE COVER NOW. ABANDON MOBILE HOMES AND VEHICLES. MOVE TO A SHELTER
BELOW GROUND IF POSSIBLE. OTHERWISE...MOVE TO AN INTERIOR ROOM OR
HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS.

CJS

LAT...LON 3424 9815 3407 9848 3423 9877 3444 9844

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 4:55 PM CDT	Severe Thunderstorm Warning	OUN	Harper	50 min
Apr 6, 6:01 PM CDT	Severe Thunderstorm Warning	OUN	Tillman	44 min
Apr 6, 6:26 PM CDT	Severe Thunderstorm Warning	OUN	Dewey, Woodward	49 min
Apr 6, 6:39 PM CDT	Severe Thunderstorm Warning	OUN	Woods	51 min
Apr 6, 6:43 PM CDT	Severe Thunderstorm Warning	OUN	Cotton, Tillman	62 min
Apr 6, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Stephens	65 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.