Tornadoes · United States · Colorado · 1973

F1 tornado, Baca County, Colorado, May 6, 1973

This F1 tornado ran 0.5 miles across Baca County on May 6, 1973, touching down at 1:30 PM MDT and reaching 100 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 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
May 6, 1973
Touchdown
1:30 PM MDT (19:30 UTC)
Path length
0.5 miles (0.8 km)
Path width
100 yards (91 m)
Deaths
0
Injuries
0
County
Baca County
Touchdown point
37.630, -102.320
Record number
286

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

7.5 hours before the tornado, 213 km from the path. May 6, 1973.

Skew-T log-pSkew-T log-p diagram, Dodge City, at 12:00Z on 1973-05-06Temperature 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 -9663, lifted condensation level 1793 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, Dodge City, at 12:00Z on 1973-05-06The 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 145 square meters per square second, 0 to 6 km bulk shear 23 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
-9663 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
1793 m above ground
0-6 km bulk shear
23 kt
0-1 km bulk shear
25 kt
0-1 km storm-relative helicity
145 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
3.7 K/km

Open this sounding in Storm Lab

Dodge City, (KDDC), 00:00Z

4.5 hours after it, 213 km from the path. May 7, 1973.

Skew-T log-pSkew-T log-p diagram, Dodge City, at 00:00Z on 1973-05-07Temperature 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 -11808, lifted condensation level 3428 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, Dodge City, at 00:00Z on 1973-05-07The 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 -16 square meters per square second, 0 to 6 km bulk shear 32 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
0 J/kg
Mixed-layer CIN
-11808 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
3428 m above ground
0-6 km bulk shear
32 kt
0-1 km bulk shear
8 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
-9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
9.5 K/km

Open this sounding in Storm Lab

This ground now

The live radar over the trackEvery 1973 tornado in ColoradoEvery tornado in Colorado since 1950Warnings in force in Colorado nowThe forecast where you are

The other tornadoes of May 6, 1973

15 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
May 63:00 PM CDTF2Seminole, OK9.170$50,000 to $500,000
May 62:30 PM MDTF1Baca, CO0.350
May 63:00 PM MDTF2Kit Carson, CO1.01005$5,000 to $50,000
May 64:40 PM CDTF2Parker, TX1.050$5,000 to $50,000
May 65:30 PM CDTF0Jackson, KS0.2133$50 to $500
May 64:50 PM MDTF0Sherman, KS0.2133
May 66:01 PM CDTF2Parker, TX1.01003$5,000 to $50,000
May 67:00 PM CDTF0Pittsburg, OK5.240$5,000 to $50,000
May 66:10 PM MDTF0Sherman, KS0.2133
May 68:10 PM CDTF1Grant, OK1.050$5,000 to $50,000
May 68:15 PM CDTF2Johnson, TX12.0100$50,000 to $500,000
May 68:25 PM CDTF5McLennan, TX10.6100
May 68:30 PM CDTF2Fannin, TX0.120$5,000 to $50,000
May 69:20 PM CDTF2Tarrant, TX2.5150$50,000 to $500,000
May 610:30 PM CDTF2Fannin, TX0.5673$50,000 to $500,000

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.