Tornadoes · United States · Colorado · 1976

F0 tornado, Prowers County, Colorado, May 29, 1976

This F0 tornado ran 0.1 miles across Prowers County on May 29, 1976, touching down at 4:20 PM MDT and reaching 20 yards wide. It killed nobody.

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 mphthis tornado

    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 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
F0
Date
May 29, 1976
Touchdown
4:20 PM MDT (22:20 UTC)
Path length
0.1 miles (0.2 km)
Path width
20 yards (18 m)
Deaths
0
Injuries
0
County
Prowers County
Touchdown point
38.270, -102.080
Record number
471

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.

Dodge City, (KDDC), 12:00Z

10.3 hours before the tornado, 199 km from the path. May 29, 1976.

Skew-T log-pSkew-T log-p diagram, Dodge City, at 12:00Z on 1976-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 233 joules per kilogram, CIN -479, lifted condensation level 1998 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, Dodge City, at 12:00Z on 1976-05-29The 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 84 square meters per square second, 0 to 6 km bulk shear 17 knots.1939Sfc1 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
233 J/kg
Mixed-layer CIN
-479 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
1998 m above ground
0-6 km bulk shear
17 kt
0-1 km bulk shear
23 kt
0-1 km storm-relative helicity
84 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
3.5 K/km

Open this sounding in Storm Lab

Dodge City, (KDDC), 00:00Z

1.7 hours after it, 199 km from the path. May 30, 1976.

Skew-T log-pSkew-T log-p diagram, Dodge City, at 00:00Z on 1976-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 1889 joules per kilogram, CIN -190, lifted condensation level 1745 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, Dodge City, at 00:00Z on 1976-05-30The 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 -9 square meters per square second, 0 to 6 km bulk shear 22 knots.1939Sfc1 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
1889 J/kg
Mixed-layer CIN
-190 J/kg
Surface CAPE
3658 J/kg
Mixed-layer LCL
1745 m above ground
0-6 km bulk shear
22 kt
0-1 km bulk shear
2 kt
0-1 km storm-relative helicity
-9 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0
0-3 km lapse rate
7.1 K/km

Open this sounding in Storm Lab

The surface observations

Garden_city (GCK), 125 km from the path, in the two hours either side.

Time (UTC)Temp (°F)Dew point (°F)WindGust (kt)Pressure (mb)Weather
21:00 UTC904850° 16 kt1003.4
22:00 UTC8548130° 13 kt1003
23:04 UTC804840° 8 kt1002.7
00:00 UTC360°

From the Iowa Environmental Mesonet's archive of airport observations.

This ground now

The live radar over the trackEvery 1976 tornado in ColoradoEvery tornado in Colorado since 1950Warnings in force in Colorado nowThe forecast where you are

The other tornadoes of May 29, 1976

16 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
May 292:45 PM MDTF0Weld, CO0.120
May 295:00 PM EDTF0Palm Beach, FL0.110$500 to $5,000
May 293:14 PM MDTF0Weld, CO0.120
May 293:14 PM MDTF0Weld, CO0.120
May 293:15 PM MDTF2Laramie, WY0.240$50 to $500
May 293:30 PM MDTF0Weld, CO0.120
May 293:30 PM MDTF0Weld, CO0.110
May 293:30 PM MDTF0Weld, CO0.110
May 293:45 PM MDTF0Weld, CO0.110
May 293:50 PM MDTF2Laramie, WY0.140$50 to $500
May 294:00 PM MDTF0Logan, CO0.110
May 294:17 PM MDTF0Weld, CO0.120
May 294:20 PM MDTF0Kiowa, CO0.110
May 294:30 PM MDTF0Logan, CO0.110
May 296:29 PM CDTF1Jackson, OK0.330
May 296:29 PM CDTF1Jackson, OK0.330

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.