Tornadoes · United States · Missouri · 1973

F2 tornado, Howell County, Missouri, May 7, 1973

This F2 tornado ran 7.4 miles across Howell County on May 7, 1973, touching down at 3:25 PM CDT and reaching 100 yards wide. It killed nobody and injured 1, 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 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
May 7, 1973
Touchdown
3:25 PM CDT (20:25 UTC)
Path length
7.4 miles (11.9 km)
Path width
100 yards (91 m)
Deaths
0
Injuries
1
Property damage
$5,000 to $50,000
County
Howell County
Touchdown point
36.730, -92.070
Lift-off point
36.750, -91.930
Record number
308

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.

Springfield, MO (KUMN), 12:00Z

8.4 hours before the tornado, 161 km from the path. May 7, 1973.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 12:00Z 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 0, lifted condensation level 0 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, Springfield, MO at 12:00Z 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 62 square meters per square second, 0 to 6 km bulk shear 70 knots.1939587897117136Sfc1 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
0 J/kg
Surface CAPE
12 J/kg
Mixed-layer LCL
0 m above ground
0-6 km bulk shear
70 kt
0-1 km bulk shear
17 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
133 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
5.1 K/km

Open this sounding in Storm Lab

Springfield, MO (KUMN), 00:00Z

3.6 hours after it, 161 km from the path. May 8, 1973.

Skew-T log-pSkew-T log-p diagram, Springfield, MO at 00:00Z on 1973-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 22 joules per kilogram, CIN -39, lifted condensation level 1015 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, Springfield, MO at 00:00Z on 1973-05-08The 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 21 square meters per square second, 0 to 6 km bulk shear 42 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
22 J/kg
Mixed-layer CIN
-39 J/kg
Surface CAPE
161 J/kg
Mixed-layer LCL
1015 m above ground
0-6 km bulk shear
42 kt
0-1 km bulk shear
18 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
91 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.0
0-3 km lapse rate
6.7 K/km

Open this sounding in Storm Lab

This ground now

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

The other tornadoes of May 7, 1973

23 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
May 72:25 AM CDTF2Searcy, AR2.7150$50,000 to $500,000
May 72:50 AM CDTF2Webster Parish, LA0.5272$5,000 to $50,000
May 71:20 PM CDTF2Clay, MO0.520$5,000 to $50,000
May 72:40 PM CDTF1Marengo, AL1.0400$5,000 to $50,000
May 72:45 PM CDTF1Ozark, MO5.050$5,000 to $50,000
May 73:05 PM CDTF2Baxter, AR2.0100$5,000 to $50,000
May 75:05 PM CDTF2Madison, MO14.6100$50,000 to $500,000
May 75:45 PM CDTF0Polk, MO1.050$5,000 to $50,000
May 75:45 PM CDTF1Pike, MO1.050$500 to $5,000
May 75:50 PM CDTF3Butler, MO36.01007$50,000 to $500,000
May 76:10 PM CDTF2Saint Louis, MO0.550$5,000 to $50,000
May 76:15 PM CDTF1Perry, MO1.050$500 to $5,000
May 76:30 PM CDTF0Story, IA0.560
May 76:40 PM CDTF2Perry, IL0.110
May 77:15 PM CDTF1Monroe, IL2.3300$5,000 to $50,000
May 77:30 PM CDTF1Jefferson, IL0.1103
May 77:40 PM CDTF1Marion, IL0.1101
May 77:45 PM CDTF2Poinsett, AR4.71002$5,000 to $50,000
May 77:50 PM CDTF0Black Hawk, IA0.550
May 78:20 PM CDTF1Wayne, IL0.110$5,000 to $50,000
May 78:25 PM CDTF0Cape Girardeau, MO0.327$50 to $500
May 79:30 PM CDTF2Stoddard, MO0.327$50 to $500
May 712:45 AM ESTF1Marion, IN2.520$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.