Tornadoes · United States · Nebraska · 1984

F2 tornado, Dundy County, Nebraska, June 11, 1984

This F2 tornado ran 1.0 miles across Dundy County on June 11, 1984, touching down at 2:30 PM MDT and reaching 30 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 11, 1984
Touchdown
2:30 PM MDT (20:30 UTC)
Path length
1.0 miles (1.6 km)
Path width
30 yards (27 m)
Deaths
0
Injuries
0
Property damage
$50,000 to $500,000
County
Dundy County
Touchdown point
40.220, -102.030
Record number
543

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.

Denver, CO (KDEN), 12:00Z

8.5 hours before the tornado, 109 km from the path. June 11, 1984.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 1984-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 74 joules per kilogram, CIN -152, lifted condensation level 643 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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, Denver, CO at 12:00Z on 1984-06-11The 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 27 square meters per square second, 0 to 6 km bulk shear 53 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
74 J/kg
Mixed-layer CIN
-152 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
643 m above ground
0-6 km bulk shear
53 kt
0-1 km bulk shear
17 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
78 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.9 K/km

Open this sounding in Storm Lab

Denver, CO (KDEN), 00:00Z

3.5 hours after it, 109 km from the path. June 12, 1984.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 1984-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 277 joules per kilogram, CIN -167, lifted condensation level 2956 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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, Denver, CO at 00:00Z on 1984-06-12The 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 71 square meters per square second, 0 to 6 km bulk shear 44 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
277 J/kg
Mixed-layer CIN
-167 J/kg
Surface CAPE
1221 J/kg
Mixed-layer LCL
2956 m above ground
0-6 km bulk shear
44 kt
0-1 km bulk shear
11 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
184 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6
0-3 km lapse rate
8.6 K/km

Open this sounding in Storm Lab

This ground now

The live radar over the trackEvery 1984 tornado in NebraskaEvery tornado in Nebraska since 1950Warnings in force in Nebraska nowThe forecast where you are

The other tornadoes of June 11, 1984

21 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
June 112:55 PM MDTF2Chase, NE2.030$5,000 to $50,000
June 114:12 PM MDTF0Chase, NE0.120
June 116:15 PM EDTF0Hillsborough, FL1.030$5,000 to $50,000
June 116:10 PM CDTF0Dawson, NE0.110
June 116:00 PM MDTF1Billings, ND3.0400$500 to $5,000
June 117:00 PM CDTF1Cedar, NE19.030$5,000 to $50,000
June 117:23 PM CDTF0Adair, IA0.110$5,000 to $50,000
June 117:48 PM CDTF1Buffalo, NE0.530$5,000 to $50,000
June 117:50 PM CDTF0Polk, IA0.110$500 to $5,000
June 118:00 PM CDTF2Clay, SD0.110$5,000 to $50,000
June 118:28 PM CDTF0Polk, IA0.110
June 118:30 PM CDTF1Dawson, NE0.320$50,000 to $500,000
June 117:40 PM MDTF1Sherman, KS9.0300$50,000 to $500,000
June 118:55 PM CDTF0Polk, IA0.110$500 to $5,000
June 118:01 PM MDTF2Sherman, KS12.0400$50,000 to $500,000
June 119:20 PM CDTF3Hall, NE14.0200$500,000 to $5 million
June 119:20 PM CDTF2Buffalo, NE0.520$5,000 to $50,000
June 118:50 PM MDTF1Perkins, NE14.020$500 to $5,000
June 1110:40 PM CDTF1Lincoln, NE1.030$500 to $5,000
June 1111:00 PM CDTF1Rawlins, KS25.0200$50,000 to $500,000
June 1111:04 PM CDTF0Lincoln, NE0.120

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.