Tornadoes · United States · Kansas · 1993

F0 tornado, Lyon County, Kansas, July 2, 1993

This F0 tornado ran 0.3 miles across Lyon County on July 2, 1993, touching down at 7:13 PM CDT and reaching 23 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
July 2, 1993
Touchdown
7:13 PM CDT (00:13 UTC)
Path length
0.3 miles (0.5 km)
Path width
23 yards (21 m)
Deaths
0
Injuries
0
County
Lyon County
Touchdown point
38.380, -96.180
Record number
696

The warnings

28 minutes of warning. NWS TOP issued a tornado warning for this county at 23:45 UTC, 28 minutes before the tornado touched down, in force until 00:15 UTC.

Issued (UTC)ExpiredProductOffice
23:45 UTC00:15 UTCTornado WarningTOP
00:14 UTC00:45 UTCTornado WarningTOP
01:31 UTC02:15 UTCSevere Thunderstorm WarningTOP
02:02 UTC04:00 UTCFlash Flood WarningTOP

Every warning and watch covering the touchdown point that day, from the Iowa Environmental Mesonet's archive of National Weather Service products. Lead time is measured from the issue of the warning in force to the touchdown time in the database, both of which were recorded to the minute by different people.

The forecast that day

The Storm Prediction Center had this point in a Slight Risk. The outlook in force was issued at 06:21 UTC.

SPC's Day 1 convective outlook as it stood when the tornado began, read at the touchdown point. The same archive is on the radar archive.

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.

Topeka, KS (KTOP), 00:00Z

0.2 hours before the tornado, 83 km from the path. July 3, 1993.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 1993-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 579 joules per kilogram, CIN -226, lifted condensation level 1378 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, Topeka, KS at 00:00Z on 1993-07-03The 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 31 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
579 J/kg
Mixed-layer CIN
-226 J/kg
Surface CAPE
514 J/kg
Mixed-layer LCL
1378 m above ground
0-6 km bulk shear
31 kt
0-1 km bulk shear
12 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.6
0-3 km lapse rate
5.4 K/km

Open this sounding in Storm Lab

Topeka, KS (KTOP), 12:00Z

11.8 hours after it, 83 km from the path. July 3, 1993.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 1993-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 981 joules per kilogram, CIN -210, lifted condensation level 976 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, Topeka, KS at 12:00Z on 1993-07-03The 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 41 square meters per square second, 0 to 6 km bulk shear 11 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
981 J/kg
Mixed-layer CIN
-210 J/kg
Surface CAPE
640 J/kg
Mixed-layer LCL
976 m above ground
0-6 km bulk shear
11 kt
0-1 km bulk shear
29 kt
0-1 km storm-relative helicity
41 m²/s²
0-3 km storm-relative helicity
82 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.1 K/km

Open this sounding in Storm Lab

This ground now

The live radar over the trackEvery 1993 tornado in KansasEvery tornado in Kansas since 1950Warnings in force in Kansas nowThe forecast where you are

The other tornadoes of July 2, 1993

10 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
July 26:07 PM CDTF0Chase, KS0.550$500 to $5,000
July 26:49 PM CDTF0McHenry, IL0.520
July 26:50 PM CDTF1Poweshiek, IA4.530$500 to $5,000
July 27:00 PM CDTF0Kane, IL0.220
July 27:50 PM CDTF0Effingham, IL0.433$500 to $5,000
July 29:18 PM CDTF0Jackson, IA0.530$500 to $5,000
July 28:56 PM MDTF0Fall River, SD2.030$50 to $500
July 29:30 PM MDTF0Fall River, SD1.023under $50
July 211:15 PM MDTF0Rosebud, MT0.110
July 211:30 PM MDTF0Rosebud, MT0.110

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.