Tornadoes · United States · Ohio · 1977

F2 tornado, Huron County, Ohio, June 30, 1977

This F2 tornado ran 0.7 miles across Huron County on June 30, 1977, touching down at 7:40 PM EDT and reaching 50 yards wide. It killed nobody, and did $50,000 to $500,000 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
June 30, 1977
Touchdown
7:40 PM EDT (23:40 UTC)
Path length
0.7 miles (1.1 km)
Path width
50 yards (46 m)
Deaths
0
Injuries
0
Property damage
$50,000 to $500,000
County
Huron County
Touchdown point
41.300, -82.830
Record number
522

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.

Detroit, MI (KFNT), 12:00Z

11.7 hours before the tornado, 165 km from the path. June 30, 1977.

Skew-T log-pSkew-T log-p diagram, Detroit, MI at 12:00Z on 1977-06-30Temperature 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 -8082, lifted condensation level 1460 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, Detroit, MI at 12:00Z on 1977-06-30The 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 79 square meters per square second, 0 to 6 km bulk shear 43 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
-8082 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
1460 m above ground
0-6 km bulk shear
43 kt
0-1 km bulk shear
16 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
3.0 K/km

Open this sounding in Storm Lab

Detroit, MI (KFNT), 00:00Z

0.3 hours after it, 165 km from the path. July 1, 1977.

Skew-T log-pSkew-T log-p diagram, Detroit, MI at 00:00Z on 1977-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 41 joules per kilogram, CIN -505, lifted condensation level 563 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 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, Detroit, MI at 00:00Z on 1977-07-01The 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 254 square meters per square second, 0 to 6 km bulk shear 43 knots.19395878Sfc1 km3 km6 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
41 J/kg
Mixed-layer CIN
-505 J/kg
Surface CAPE
230 J/kg
Mixed-layer LCL
563 m above ground
0-6 km bulk shear
43 kt
0-1 km bulk shear
33 kt
0-1 km storm-relative helicity
254 m²/s²
0-3 km storm-relative helicity
273 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

This ground now

The live radar over the trackEvery 1977 tornado in OhioEvery tornado in Ohio since 1950Warnings in force in Ohio nowThe forecast where you are

The other tornadoes of June 30, 1977

28 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
June 309:35 AM CDTF0LaSalle, IL3.6177
June 309:35 AM CDTF3LaSalle, IL6.1850$5,000 to $50,000
June 309:45 AM CDTF0Kendall, IL3.0177
June 309:45 AM CDTF1DeKalb, IL1.690$5,000 to $50,000
June 3010:10 AM CDTF0Kendall, IL1.7350
June 302:15 PM CDTF1Will, IL0.490$500 to $5,000
June 302:30 PM CDTF1Will, IL2.3177$5,000 to $50,000
June 302:45 PM CDTF1Cook, IL1.033$50,000 to $500,000
June 303:53 PM CDTF2Lake, IN6.83001$500,000 to $5 million
June 303:55 PM CDTF1Lake, IN1.3120$500 to $5,000
June 306:00 PM EDTF1Paulding, OH4.1150$50,000 to $500,000
June 305:00 PM CDTF2Bollinger, MO2.0504$50,000 to $500,000
June 306:30 PM EDTF1Henry, OH1.0100$500 to $5,000
June 305:50 PM CDTF1Vanderburgh, IN15.3501$50,000 to $500,000
June 306:00 PM CDTF1Gibson, IN0.120$50,000 to $500,000
June 307:15 PM EDTF1Sandusky, OH3.388018$5 million to $50 million
June 307:40 PM EDTF1Huron, OH0.550$50,000 to $500,000
June 307:50 PM EDTF1Crawford, OH11.677$50,000 to $500,000
June 308:00 PM EDTF1Erie, OH0.82003$5,000 to $50,000
June 308:10 PM EDTF2Richland, OH0.550$50,000 to $500,000
June 308:15 PM EDTF0Ashland, OH0.527$50,000 to $500,000
June 308:30 PM EDTF0Jefferson, KY2.0100$5,000 to $50,000
June 309:10 PM EDTF1Medina, OH2.03003$5,000 to $50,000
June 308:25 PM CDTF2Pecos, TX0.530
June 309:30 PM EDTF2Stark, OH0.550$5,000 to $50,000
June 3010:00 PM EDTF1Anderson, KY1.0300$5,000 to $50,000
June 3010:30 PM EDTF1Montgomery, KY0.2506$50,000 to $500,000
June 3011:00 PM EDTF1Coshocton, OH0.550$5,000 to $50,000

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.