Alert archive / Oklahoma / Tornado Warnings in 1993

Tornado Warning 16, NWS Norman, OK

April 30, 1993Harper County, Oklahoma

NWS Norman, OK issued this tornado warning at Apr 30, 1993, 9:14 PM CDT for Harper County, Oklahoma. It was in force for 36 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: Apr 30, 1993, 9:14 PM CDT (02:14 UTC)
Expired: Apr 30, 1993, 9:50 PM CDT
In force: 36 min
Issued by: NWS Norman, OK
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Harper County, OK

What was reported inside it

Time	Report	Where	Remark
Apr 30, 9:14 PM CDT	Tornado F0	May, OK
Apr 30, 9:27 PM CDT	Tornado F0	May, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 2.2 hours before the alert went out and 111 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: 1353 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1197 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 171 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this tornado warning went out at Apr 30, 3:49 PM CDT, 5 hours 25 minutes earlier.

Area forecast discussion, Apr 30, 3:49 PM CDT, 5 hours 25 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
345 PM CDT FRI APR 30 1993

RATHER COMPLEX FCST FOR WEEKEND...LEESIDE TROF DVLPG IN ERN CO AND NM
HAS RETURNED WNDS TO SLY ACRS THE FA. SCT LN OF TSTMS HAS DVLPD IN
AREA OF LO LVL CONVGC FM SCNTRL KS TO THE ERN TX PH. MAIN UPR SUPPORT
FOR THESE WL BE TO THE N ACRS KS AND WL KEEP POPS FAIRLY LOW FOR TNGT...
HOWEVER OTHER ACVITITY CUD MOV NWD FM NRN TX INTO SERN ZONES THO MAIN
SUPPORT FOR THIS IS A VORTMX E OF THE BIG BEND THIS AFTN WHICH WL REMAIN
WELL TO OUR SOUTH. JUST HOW MUCH MSTR WL BE LEFT WHEN NEG TILT LO APRCHS
FM THE W SAT IS NOT CERTAIN ATTM...MODELS DIFFER GRTLY IN SPEED OF SYSM
WITH RAFS CONSIDERABLY SLOWER THAN THE ERL AND AVN. HV USED A COMP FOR
THE SPEED OF THE SYSM AND GONE WITH FAIRLY HEFTY POPS MOST ALL ZONES
SAT AND SAT NGT THEN DCRG SUN. TEMPS IN FAIRLY GOOD AGREEMENT  AND
FOLLOWED FAIRLY CLOSELY XCP FOR WRMR THAN THE FPC FOR SAT NGTS MINS.

OKC 57/73/52/69 3563  GAG 54/69/48/63 4642  HBR 56/74/52/67 4642
PNC 54/73/52/66 3563  SPS 58/76/55/73 4553

12

.OK...NONE.
.TX...NONE.

In the hours before

Local storm report, Apr 30, 6:44 PM CDT, 2 hours 30 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OKLAHOMA CITY OK
640 PM CDT FRI APR 30 1993

TIME            COUNTY           EVENT
530 PM          HARPER        GOLFBALL SIZE HAIL SW OF LAVERNE 1 MILE
                              EAST OF COUNTY LINE
545 PM          HARPER        GOLFBALL SIZE HAIL S OF LAVERNE ON HWY 270

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:26 PM CDT	Severe Thunderstorm Warning	OUN	Woods	64 min
Apr 30, 7:30 PM CDT	Tornado Warning	OUN	Harper	30 min
Apr 30, 7:56 PM CDT	Tornado Warning	OUN	Harper	44 min
Apr 30, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Woods	25 min
Apr 30, 8:38 PM CDT	Tornado Warning	OUN	Harper	37 min
Apr 30, 9:03 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	42 min
Apr 30, 9:40 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	50 min
Apr 30, 9:45 PM CDT	Tornado Warning	OUN	Harper, Woodward	30 min
Apr 30, 10:15 PM CDT	Severe Thunderstorm Warning	OUN	Harper, Woodward	60 min
Apr 30, 10:58 PM CDT	Tornado Warning	OUN	Woodward	32 min
Apr 30, 11:27 PM CDT	Tornado Warning	OUN	Woodward	48 min
Apr 30, 11:31 PM CDT	Severe Thunderstorm Warning	OUN	Harper	59 min
Apr 30, 11:38 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa	67 min
May 1, 12:15 AM CDT	Tornado Warning	OUN	Woodward	45 min
May 1, 12:40 AM CDT	Severe Thunderstorm Warning	OUN	Woods	60 min
May 1, 12:54 AM CDT	Tornado Warning	OUN	Woodward	46 min
May 1, 1:40 AM CDT	Severe Thunderstorm Warning	OUN	Major, Woods, Woodward	50 min
May 1, 4:49 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa	41 min
May 1, 5:11 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	49 min
May 1, 5:27 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa	48 min
May 1, 5:58 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	47 min
May 1, 5:19 PM CDT	Severe Thunderstorm Warning	OUN	Foard	41 min

Nearby

Tornado Warnings in Oklahoma, 1993 Every tornado warning in 1993 Tornadoes in 1993

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.