Tornadoes · United States · Oklahoma · 1957

F0 tornado, Jackson County, Oklahoma, April 2, 1957

This F0 tornado ran 8.8 miles across Jackson County on April 2, 1957, touching down at 7:05 PM GMT-6 and reaching 100 yards wide. It killed nobody, and did $5,000 to $50,000 of property damage.

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
April 2, 1957
Touchdown
7:05 PM GMT-6 (01:05 UTC)
Path length
8.8 miles (14.2 km)
Path width
100 yards (91 m)
Deaths
0
Injuries
0
Property damage
$5,000 to $50,000
County
Jackson County
Touchdown point
34.600, -99.320
Lift-off point
34.680, -99.200
Record number
81

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.

Altus AFB, OK (KLTS), 12:00Z

10.9 hours after it, 6 km from the path. April 3, 1957.

Skew-T log-pSkew-T log-p diagram, Altus AFB, OK at 12:00Z on 1957-04-03Temperature 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 -11135, lifted condensation level 961 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, Altus AFB, OK at 12:00Z on 1957-04-03The 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 -152 square meters per square second, 0 to 6 km bulk shear 98 knots.1939587897117136156Sfc1 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
-11135 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
98 kt
0-1 km bulk shear
9 kt
0-1 km storm-relative helicity
-152 m²/s²
0-3 km storm-relative helicity
-280 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
3.9 K/km

Open this sounding in Storm Lab

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The other tornadoes of April 2, 1957

27 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
April 23:00 AM GMT-6F0Denton, TX0.110
April 23:00 PM GMT-6F2Grayson, TX0.1102$5,000 to $50,000
April 23:25 PM GMT-6F2Montague, TX2.0331$5,000 to $50,000
April 23:30 PM GMT-6F1Jefferson, OK2.010$500 to $5,000
April 23:50 PM GMT-6F0Tarrant, TX0.367$500 to $5,000
April 24:00 PM GMT-6F0Grayson, TX0.110$5,000 to $50,000
April 24:20 PM GMT-6F3Collin, TX10.7334$50,000 to $500,000
April 24:30 PM GMT-6F3Dallas, TX17.210010200$500,000 to $5 million
April 24:50 PM GMT-6F2Murray, OK11.74001$5,000 to $50,000
April 24:55 PM GMT-6F2Murray, OK2.060012$50,000 to $500,000
April 25:29 PM GMT-6F4Marshall, OK5.220026$500,000 to $5 million
April 25:58 PM GMT-6F4Bryan, OK7.920033$50,000 to $500,000
April 26:00 PM GMT-6F2Lamar, TX6.510012$5,000 to $50,000
April 26:05 PM GMT-6F2Wheeler, TX0.333$5,000 to $50,000
April 26:15 PM GMT-6F3Wise, TX0.1101$50,000 to $500,000
April 26:30 PM GMT-6F1Denton, TX1.567$5,000 to $50,000
April 26:30 PM GMT-6F2Jackson, OK43.71501$5,000 to $50,000
April 26:30 PM GMT-6F2Lamar, TX0.110$5,000 to $50,000
April 26:40 PM GMT-6F0Pottawatomie, OK0.110under $50
April 27:15 PM GMT-6F1Choctaw, OK16.810$5,000 to $50,000
April 27:51 PM GMT-6F2Delta, TX0.11012$5,000 to $50,000
April 29:00 PM GMT-6F2Latimer, OK23.38802$5,000 to $50,000
April 29:05 PM GMT-6F2Pittsburg, OK11.7440$5,000 to $50,000
April 29:30 PM GMT-6F1McCurtain, OK11.2880$5,000 to $50,000
April 29:50 PM GMT-6F0LeFlore, OK0.110under $50
April 210:30 PM GMT-6F0Oklahoma, OK0.110under $50
April 211:45 PM GMT-6F1Love, OK0.110

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.