Tornadoes · United States · Kentucky · 1991

F2 tornado, Todd, Logan and Warren counties, Kentucky, March 22, 1991

This F2 tornado ran 39.0 miles across Todd, Logan and Warren counties on March 22, 1991, touching down at 5:50 PM CST and reaching 400 yards wide. It killed 1 person and injured 12, and did $500,000 to $5 million 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
March 22, 1991
Touchdown
5:50 PM CST (23:50 UTC)
Path length
39.0 miles (62.8 km)
Path width
400 yards (366 m)
Deaths
1
Injuries
12
Property damage
$500,000 to $5 million
Counties
Todd, Logan and Warren counties
Touchdown point
36.650, -87.180
Lift-off point
37.120, -86.430
Record number
113

What the Weather Service recorded

The deaths

1 direct deaths are recorded for this tornado, each with what Storm Data knows of it.

AgeSexWhereKind
Direct

From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.

The warnings

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.

Issued (UTC)ExpiredProductOffice
16:37 UTC17:10 UTCSevere Thunderstorm WarningIND
00:32 UTC02:30 UTCFlash Flood WarningIND

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 High Risk. The outlook in force was issued at 06:28 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.

Nashville Metro, TN (KBNA), 12:00Z

11.8 hours before the tornado, 86 km from the path. March 22, 1991.

Skew-T log-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 1991-03-22Temperature 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 -8045, lifted condensation level 728 meters above ground. Wind barbs in knots down the right edge.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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, Nashville Metro, TN at 12:00Z on 1991-03-22The 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 -233 square meters per square second, 0 to 6 km bulk shear 77 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
0 J/kg
Mixed-layer CIN
-8045 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
728 m above ground
0-6 km bulk shear
77 kt
0-1 km bulk shear
22 kt
0-1 km storm-relative helicity
-233 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
4.5 K/km

Open this sounding in Storm Lab

Nashville Metro, TN (KBNA), 00:00Z

0.2 hours after it, 86 km from the path. March 23, 1991.

Skew-T log-pSkew-T log-p diagram, Nashville Metro, TN at 00:00Z on 1991-03-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 581 joules per kilogram, CIN -35, lifted condensation level 1260 meters above ground. Wind barbs in knots down the right edge.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°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, Nashville Metro, TN at 00:00Z on 1991-03-23The 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 394 square meters per square second, 0 to 6 km bulk shear 66 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
581 J/kg
Mixed-layer CIN
-35 J/kg
Surface CAPE
585 J/kg
Mixed-layer LCL
1260 m above ground
0-6 km bulk shear
66 kt
0-1 km bulk shear
29 kt
0-1 km storm-relative helicity
394 m²/s²
0-3 km storm-relative helicity
582 m²/s²
Significant tornado parameter
1.7
Supercell composite
6.3
0-3 km lapse rate
6.5 K/km

Open this sounding in Storm Lab

The surface observations

Bowling Green (BWG), 35 km from the path, in the two hours either side.

Time (UTC)Temp (°F)Dew point (°F)WindGust (kt)Pressure (mb)Weather
22:00 UTC7264120° 14 kt1007.5
22:55 UTC120° 7 kt1006.4TS
23:00 UTC7264120° 10 kt1006.4
00:00 UTC7464160° 15 kt201007.1TSRA
00:35 UTC130° 10 kt1007.1TSRA
01:00 UTC6765160° 15 kt201008.5TSRA
01:01 UTC140° 15 kt1006.8TSRA

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

This ground now

The live radar over the trackEvery 1991 tornado in KentuckyEvery tornado in Kentucky since 1950Warnings in force in Kentucky nowThe forecast where you are

The other tornadoes of March 22, 1991

22 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
March 227:15 AM CSTF2Cleburne, AR15.0501$50,000 to $500,000
March 228:58 AM CSTF0Polk, AR0.240$50 to $500
March 223:20 PM CSTF0Guthrie, IA0.120$50 to $500
March 223:54 PM CSTF2Boone, IA7.050$50,000 to $500,000
March 224:00 PM CSTF3Benton, MS23.05003$50,000 to $500,000
March 224:20 PM CSTF3Story, IA43.070$500,000 to $5 million
March 224:35 PM CSTF3McNairy, TN22.0200445$5 million to $50 million
March 224:42 PM CSTF0Story, IA0.120$50 to $500
March 225:00 PM CSTF2Benton, TN7.0150$500,000 to $5 million
March 225:25 PM CSTF1Hardin, TN1.050$5,000 to $50,000
March 225:25 PM CSTF2Grundy, IA20.050$50,000 to $500,000
March 225:30 PM CSTF1Wayne, TN1.050$50,000 to $500,000
March 225:30 PM CSTF1Hardin, IA2.023$50,000 to $500,000
March 226:05 PM CSTF2Lewis, TN5.050114$5 million to $50 million
March 226:16 PM CSTF0Iowa, IA0.120$500 to $5,000
March 227:10 PM CSTF2Johnson, IA14.080$50,000 to $500,000
March 227:25 PM CSTF2Delaware, IA17.0801$50,000 to $500,000
March 227:30 PM CSTF1Cedar, IA0.120$500 to $5,000
March 228:00 PM CSTF0Delaware, IA0.120$500 to $5,000
March 228:00 PM CSTF2Clinton, IA7.060$500,000 to $5 million
March 2210:51 PM CSTF1Kankakee, IL9.0100$500,000 to $5 million
March 2211:13 PM CSTF1Vermilion, IL1.050$500,000 to $5 million

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.