Tornadoes · United States · Minnesota · 1964

F1 tornado, Kandiyohi County, Minnesota, June 18, 1964

This F1 tornado ran 7.2 miles across Kandiyohi County on June 18, 1964, touching down at 3:45 PM GMT-5 and reaching 77 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 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 18, 1964
Touchdown
3:45 PM GMT-5 (20:45 UTC)
Path length
7.2 miles (11.6 km)
Path width
77 yards (70 m)
Deaths
0
Injuries
0
Property damage
$5,000 to $50,000
County
Kandiyohi County
Touchdown point
45.100, -94.920
Lift-off point
45.200, -94.850
Record number
433

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.

Minneapolis, MN (KSTC), 12:00Z

8.8 hours before the tornado, 106 km from the path. June 18, 1964.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 1964-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 1040 joules per kilogram, CIN -176, lifted condensation level 674 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, Minneapolis, MN at 12:00Z on 1964-06-18The 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 180 square meters per square second, 0 to 6 km bulk shear 36 knots.193958Sfc1 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
1040 J/kg
Mixed-layer CIN
-176 J/kg
Surface CAPE
1312 J/kg
Mixed-layer LCL
674 m above ground
0-6 km bulk shear
36 kt
0-1 km bulk shear
25 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
227 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.4
0-3 km lapse rate
3.7 K/km

Open this sounding in Storm Lab

Minneapolis, MN (KSTC), 00:00Z

3.2 hours after it, 106 km from the path. June 19, 1964.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 1964-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 1135 joules per kilogram, CIN -1, lifted condensation level 1558 meters above ground. Wind barbs in knots down the right edge.LCLEL10008507005003002001001 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, Minneapolis, MN at 00:00Z on 1964-06-19The 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 58 square meters per square second, 0 to 6 km bulk shear 79 knots.1939587897117Sfc1 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
1135 J/kg
Mixed-layer CIN
-1 J/kg
Surface CAPE
1863 J/kg
Mixed-layer LCL
1558 m above ground
0-6 km bulk shear
79 kt
0-1 km bulk shear
26 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.7
0-3 km lapse rate
7.6 K/km

Open this sounding in Storm Lab

This ground now

The live radar over the trackEvery 1964 tornado in MinnesotaEvery tornado in Minnesota since 1950Warnings in force in Minnesota nowThe forecast where you are

The other tornadoes of June 18, 1964

8 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
June 182:00 AM GMT-5F2Potter, SD24.62002$5,000 to $50,000
June 1811:00 AM GMT-5F1Hand, SD11.11010$500,000 to $5 million
June 182:20 PM GMT-5F1Barnes, ND10.710$500 to $5,000
June 183:30 PM GMT-5F3Pope, MN6.220013$50,000 to $500,000
June 184:00 PM GMT-5F1Kandiyohi, MN9.71002$50,000 to $500,000
June 187:00 PM GMT-4F1Sumter, SC2.0133$500 to $5,000
June 186:45 PM GMT-5F2Barron, WI4.1132
June 187:10 PM GMT-5F0Shawnee, KS0.110

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.