Tornadoes · United States · Missouri · 1966

F2 tornado, Audrain County, Missouri, December 8, 1966

This F2 tornado ran 0.3 miles across Audrain County on December 8, 1966, touching down at 2:55 AM GMT-6 and reaching 50 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 mph

    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 mphthis tornado

    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
F2
Date
December 8, 1966
Touchdown
2:55 AM GMT-6 (08:55 UTC)
Path length
0.3 miles (0.5 km)
Path width
50 yards (46 m)
Deaths
0
Injuries
0
Property damage
$5,000 to $50,000
County
Audrain County
Touchdown point
39.220, -92.000
Record number
576

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.

Columbia Regiona, MO (KCOU), 00:00Z

8.9 hours before the tornado, 48 km from the path. December 8, 1966.

Skew-T log-pSkew-T log-p diagram, Columbia Regiona, MO at 00:00Z on 1966-12-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 657 joules per kilogram, CIN -80, lifted condensation level 1439 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, Columbia Regiona, MO at 00:00Z on 1966-12-08The 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 272 square meters per square second, 0 to 6 km bulk shear 41 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
657 J/kg
Mixed-layer CIN
-80 J/kg
Surface CAPE
910 J/kg
Mixed-layer LCL
1439 m above ground
0-6 km bulk shear
41 kt
0-1 km bulk shear
31 kt
0-1 km storm-relative helicity
272 m²/s²
0-3 km storm-relative helicity
370 m²/s²
Significant tornado parameter
0.6
Supercell composite
1.7
0-3 km lapse rate
6.9 K/km

Open this sounding in Storm Lab

Columbia Regiona, MO (KCOU), 12:00Z

3.1 hours after it, 48 km from the path. December 8, 1966.

Skew-T log-pSkew-T log-p diagram, Columbia Regiona, MO at 12:00Z on 1966-12-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 57 joules per kilogram, CIN -151, lifted condensation level 837 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, Columbia Regiona, MO at 12:00Z on 1966-12-08The 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 116 square meters per square second, 0 to 6 km bulk shear 56 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
57 J/kg
Mixed-layer CIN
-151 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
837 m above ground
0-6 km bulk shear
56 kt
0-1 km bulk shear
30 kt
0-1 km storm-relative helicity
116 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8
0-3 km lapse rate
5.2 K/km

Open this sounding in Storm Lab

This ground now

The live radar over the trackEvery 1966 tornado in MissouriEvery tornado in Missouri since 1950Warnings in force in Missouri nowThe forecast where you are

The other tornadoes of December 8, 1966

8 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
December 82:30 AM GMT-6F1Boone, MO2.573$5,000 to $50,000
December 83:50 AM GMT-6F2Phelps, MO0.217$5,000 to $50,000
December 86:50 AM GMT-6F2Jasper, IN0.1101$5,000 to $50,000
December 88:30 AM GMT-6F2Texas, MO1.0100$500 to $5,000
December 810:00 AM GMT-5F2Montgomery, IN0.110$5,000 to $50,000
December 89:20 AM GMT-6F1Howell, MO0.6100$5,000 to $50,000
December 810:20 AM GMT-6F3Washington, MO1.32002$50,000 to $500,000
December 810:55 AM GMT-6F1Saint Francois, MO2.070$500 to $5,000

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.