Tornadoes · United States · Oklahoma · 1996

F0 tornado, Purcell, Oklahoma, May 26, 1996

This F0 tornado ran 0.1 miles across McClain County on May 26, 1996, touching down at 10:32 PM CDT and reaching 25 yards wide. It killed nobody.

The rating scale

Tracks are drawn in the color of the rating. The Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.

  1. F040 to 72 mphthis tornado

    Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

  2. F173 to 112 mph

    Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

  3. F2113 to 157 mph

    Considerable damage. Roofs torn off well-built houses, frame homes shifted on their foundations, mobile homes destroyed, large trees snapped or uprooted, cars lifted off the ground.

  4. F3158 to 206 mph

    Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

  5. F4207 to 260 mph

    Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

  6. F5261 to 318 mph

    Incredible damage. Strong frame houses swept off their foundations, car-sized missiles thrown more than 100 meters, steel-reinforced concrete badly damaged, high-rise buildings deformed.

  7. Unrated

    The survey recorded a tornado but could not put a number on it, most often because it crossed open country and damaged nothing a rating can be read from.

The record

Rating
F0
Date
May 26, 1996
Touchdown
10:32 PM CDT (03:32 UTC)
Path length
0.1 miles (0.2 km)
Path width
25 yards (23 m)
Deaths
0
Injuries
0
County
McClain County
Touchdown point
34.930, -97.370
Lift-off point
34.930, -97.370
Record number
1068

What the Weather Service recorded

An F0 tornado was reported by a spotter. No damage was reported.

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

The warnings

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.

Issued (UTC)ExpiredProductOffice
03:25 UTC04:00 UTCSevere Thunderstorm WarningOUN

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The forecast that day

The Storm Prediction Center had this point in a Moderate Risk. The outlook in force was issued at 06:02 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

The air that afternoon

The radiosonde launches on either side of the tornado, from the nearest station that was launching then, drawn and analyzed the way Storm Lab does: the same diagram, the same parcel and shear definitions SPC's mesoanalysis uses.

Norman, OK (KOUN), 00:00Z

3.5 hours before the tornado, 32 km from the path. May 27, 1996.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 00:00Z on 1996-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 2217 joules per kilogram, CIN -20, lifted condensation level 1164 meters above ground. Wind barbs in knots down the right edge.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. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Norman, OK at 00:00Z on 1996-05-27The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity 274 square meters per square second, 0 to 6 km bulk shear 58 knots.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. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
2217 J/kg
Mixed-layer CIN
-20 J/kg
Surface CAPE
2024 J/kg
Mixed-layer LCL
1164 m above ground
0-6 km bulk shear
58 kt
0-1 km bulk shear
27 kt
0-1 km storm-relative helicity
274 m²/s²
0-3 km storm-relative helicity
326 m²/s²
Significant tornado parameter
4.0
Supercell composite
16.9
0-3 km lapse rate
6.4 K/km

Open this sounding in Storm Lab

Norman, OK (KOUN), 12:00Z

8.5 hours after it, 32 km from the path. May 27, 1996.

Skew-T log-pSkew-T log-p diagram, Norman, OK at 12:00Z on 1996-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 0 joules per kilogram, CIN -61160, lifted condensation level 2093 meters above ground. Wind barbs in knots down the right edge.LCL10008507005003002001001 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. The warm shading is its CAPE, the cool shading the inhibition it has to break through.
HodographHodograph, Norman, OK at 12:00Z on 1996-05-27The wind through the lowest 10 kilometers as a curve, rings every 10 meters per second labeled in knots. Zero to 1 km storm-relative helicity -192 square meters per square second, 0 to 6 km bulk shear 93 knots.1939587897117136Sfc1 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. RM and LM are the right and left moving storms Bunkers' method gives; the shaded area is the 0 to 1 km storm-relative helicity.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
-61160 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
2093 m above ground
0-6 km bulk shear
93 kt
0-1 km bulk shear
21 kt
0-1 km storm-relative helicity
-192 m²/s²
0-3 km storm-relative helicity
-97 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.2 K/km

Open this sounding in Storm Lab

The radar

The Norman radar (KTLX), 46 km away, was scanning. The volume nearest the touchdown began at 03:29 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

This ground now

The live radar over the trackEvery 1996 tornado in OklahomaEvery tornado in Oklahoma since 1950Warnings in force in Oklahoma nowThe forecast where you are

The other tornadoes of May 26, 1996

20 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
May 266:50 AM EDTF0Monroe, FL0.110
May 262:53 PM CDTF0Texas, OK0.550$10,000
May 263:16 PM CDTF0Texas, OK1.0100$10,000
May 263:16 PM CDTF0Texas, OK1.075$10,000
May 263:25 PM CDTF0Kiowa, OK1.010
May 263:39 PM CDTF3Stevens, KS13.0200$190,000
May 264:03 PM CDTF2Seward, KS20.0450$300,000
May 264:20 PM CDTF0Haskell, KS4.030$10,000
May 264:35 PM CDTF3Haskell, KS28.0900$2.0 million
May 265:15 PM CDTF1Gray, KS10.0400$850,000
May 265:18 PM CDTF1Wichita, KS1.050$50,000
May 265:20 PM CDTF1Gray, KS3.050$70,000
May 265:44 PM ESTF0Pike, IN5.075$50,000
May 267:38 PM CDTF2Rogers, OK30.08801$290,000
May 268:36 PM CDTF0Labette, KS6.075
May 269:50 PM CDTF1Crawford, KS1.075$100,000
May 269:53 PM CDTF1Barton, MO3.0100$10,000
May 269:58 PM CDTF1Johnson, MO12.0100
May 2610:02 PM CDTF1Barton, MO0.250$10,000
May 2610:36 PM CDTF0Lafayette, MO0.220

What this means

Ratings are the survey's, read off the damage rather than measured; the rating scale is above. Tornado counts rise through the record as reporting improved, so a year in the 1950s is not comparable with one today except for the strongest tornadoes, which were always noticed.

Sources

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.