Alert archive / Oklahoma / Tornado Warnings in 1989

Tornado Warning 6, NWS Norman, OK

May 17, 1989Harmon County, Oklahoma

NWS Norman, OK issued this tornado warning at May 17, 1989, 5:32 PM CDT for Harmon County, Oklahoma. It was in force for 28 min.

The area

The counties it named.

The facts

Issued
May 17, 1989, 5:32 PM CDT (22:32 UTC)
Expired
May 17, 1989, 6:00 PM CDT
In force
28 min
Issued by
NWS Norman, OK
Area
Whole counties

County Harmon County, OK

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.5 hours before the alert went out and 177 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, Amarillo Airport, TX at 12:00Z on 1989-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 93 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, Amarillo Airport, TX at 12:00Z on 1989-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 83 square meters per square second.1939587897Sfc1 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
93 J/kg
Mixed-layer CIN
-83 J/kg
Mixed-layer LCL
1018 m above ground
0-6 km bulk shear
73 kt
0-1 km storm-relative helicity
83 m²/s²
0-3 km storm-relative helicity
67 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

The office that day

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

IssuedProductOfficeCountiesLasted
May 16, 7:01 PM CDTSevere Thunderstorm WarningOUNBlaine, Dewey, Ellis, Major74 min
May 16, 7:28 PM CDTSevere Thunderstorm WarningOUNDewey, Ellis, Major, Woodward52 min
May 16, 11:36 PM CDTSevere Thunderstorm WarningOUNEllis54 min
May 17, 1:23 PM CDTSevere Thunderstorm WarningOUNTillman35 min
May 17, 6:04 PM CDTSevere Thunderstorm WarningOUNBeckham, Greer41 min
May 17, 6:47 PM CDTSevere Thunderstorm WarningOUNBeckham58 min

Nearby

Tornado Warnings in Oklahoma, 1989Every tornado warning in 1989Tornadoes in 1989

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.