Tornadoes · United States · Missouri · 1970

F1 tornado, Carroll County, Missouri, June 12, 1970

This F1 tornado ran 2.3 miles across Carroll County on June 12, 1970, touching down at 2:40 PM CDT and reaching 50 yards wide. It killed nobody, and did $50 to $500 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 mphthis tornado

    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
F1
Date
June 12, 1970
Touchdown
2:40 PM CDT (19:40 UTC)
Path length
2.3 miles (3.7 km)
Path width
50 yards (46 m)
Deaths
0
Injuries
0
Property damage
$50 to $500
County
Carroll County
Touchdown point
39.470, -93.550
Lift-off point
39.480, -93.500
Record number
296

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), 12:00Z

7.7 hours before the tornado, 135 km from the path. June 12, 1970.

Skew-T log-pSkew-T log-p diagram, Columbia Regiona, MO at 12:00Z on 1970-06-12Temperature 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 -8621, lifted condensation level 1448 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, Columbia Regiona, MO at 12:00Z on 1970-06-12The 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 119 square meters per square second, 0 to 6 km bulk shear 39 knots.19395878Sfc1 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
-8621 J/kg
Surface CAPE
131 J/kg
Mixed-layer LCL
1448 m above ground
0-6 km bulk shear
39 kt
0-1 km bulk shear
12 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
5.2 K/km

Open this sounding in Storm Lab

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

4.3 hours after it, 135 km from the path. June 13, 1970.

Skew-T log-pSkew-T log-p diagram, Columbia Regiona, MO at 00:00Z on 1970-06-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 2252 joules per kilogram, CIN -16, lifted condensation level 1197 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 1970-06-13The 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 202 square meters per square second, 0 to 6 km bulk shear 63 knots.19395878Sfc1 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
2252 J/kg
Mixed-layer CIN
-16 J/kg
Surface CAPE
4617 J/kg
Mixed-layer LCL
1197 m above ground
0-6 km bulk shear
63 kt
0-1 km bulk shear
21 kt
0-1 km storm-relative helicity
202 m²/s²
0-3 km storm-relative helicity
313 m²/s²
Significant tornado parameter
2.6
Supercell composite
20.0
0-3 km lapse rate
7.7 K/km

Open this sounding in Storm Lab

This ground now

The live radar over the trackEvery 1970 tornado in MissouriEvery tornado in Missouri since 1950Warnings in force in Missouri nowThe forecast where you are

The other tornadoes of June 12, 1970

16 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
June 123:15 PM EDTF0Ashland, OH0.110$500 to $5,000
June 122:35 PM CDTF0Carroll, MO0.110under $50
June 122:45 PM CDTF1Buffalo, NE0.110
June 123:00 PM CDTF0Carroll, MO0.110under $50
June 123:40 PM CDTF4Chariton, MO16.1400$50,000 to $500,000
June 124:19 PM CDTF3Macon, MO8.52001$500,000 to $5 million
June 125:24 PM EDTF0Okeechobee, FL0.110
June 125:00 PM CDTF2Shelby, MO2.050$5,000 to $50,000
June 125:30 PM CDTF2Lewis, MO6.2100$5,000 to $50,000
June 125:40 PM CDTF3Audrain, MO16.0100$50,000 to $500,000
June 126:40 PM CDTF2Pike, MO2.350$5,000 to $50,000
June 127:10 PM CDTF1Henry, IA1.050$500 to $5,000
June 127:10 PM CDTF1Pike, MO1.5100$50,000 to $500,000
June 127:55 PM CDTF1Pettis, MO0.3201$5,000 to $50,000
June 128:00 PM MDTF0Harding, SD0.110
June 129:48 PM CDTF0Sumner, KS2.510

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.