Tornadoes · United States · Virginia · 1998

F1 tornado, Sandy Level to Whitmell, Virginia, March 20, 1998

From Sandy Level to Whitmell, this F1 tornado ran 13.0 miles across Henry and Pittsylvania counties on March 20, 1998, touching down at 3:56 PM EST and reaching 150 yards wide. It killed nobody, and did $1.0 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 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
March 20, 1998
Touchdown
3:56 PM EST (20:56 UTC)
Path length
13.0 miles (20.9 km)
Path width
150 yards (137 m)
Deaths
0
Injuries
0
Property damage
$1.0 million
Counties
Henry and Pittsylvania counties
Touchdown point
36.570, -79.750
Lift-off point
36.700, -79.550
Record number
769

What the Weather Service recorded

Thunderstorms during the late morning and afternoon hours produced a tornado, flash flooding, hail up to golfball size, and damaging winds.From the same storm that produced two tornadoes in North Carolina, a tornado formed about 2 miles west of Sandy Level in extreme southeastern Henry County and travelled northeast about 11 miles before dissipating about 2 miles west of Whitmell in Pittsylvania County. This tornado was generally from 100 to 200 yards wide, with damage in some areas up to 350 yards wide. This tornado damaged or destroyed several vehicles, barns, and outbuildings, and more than 60 residences, damaged two churches, and toppled trees and power lines. Some of the fallen trees blocked roads for a period of time. Just before the tornado formed, trees and power lines were knocked down and large branches of trees were snapped off from the North Carolina border 3 miles west southwest of Sandy Level to 2 miles west of Sandy Level.Heavy rainfall resulted in the flooding of a creek near the Virginia Tech Airport, flooding of Sinking Creek near route 460 about 5 miles east southeast of Pembroke, flooded routes 252 and 606 about 2 miles northeast of Brownsburg, and resulted in the closing of route 11 at two locations about two miles north of Shawsville.The flooding of several creeks and streams in southwest Roanoke City, resulting in road closings and the flooding of several vehicles, a few residences, and two businesses. A portion of the first floor of a hotel was flooded.In Bedford County, West Fork Creek flooded route 24 about a mile east of Stewartsville and several roads in and near Montvale were flooded.In Pulaski County, Peak Creek flooded a road in Pulaski.

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

The warnings

15 minutes of warning. NWS RNK issued a tornado warning for this county at 20:41 UTC, 15 minutes before the tornado touched down, in force until 21:25 UTC.

Issued (UTC)ExpiredProductOffice
20:41 UTC21:25 UTCTornado WarningRNK

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 11:01 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.

Roanoke, VA (KRNK), 12:00Z

8.9 hours before the tornado, 64 km from the path. March 20, 1998.

Skew-T log-pSkew-T log-p diagram, Roanoke, VA at 12:00Z on 1998-03-20Temperature 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 -65519, lifted condensation level 595 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, Roanoke, VA at 12:00Z on 1998-03-20The 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 179 square meters per square second, 0 to 6 km bulk shear 47 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
-65519 J/kg
Surface CAPE
0 J/kg
Mixed-layer LCL
595 m above ground
0-6 km bulk shear
47 kt
0-1 km bulk shear
20 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
234 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0
0-3 km lapse rate
5.0 K/km

Open this sounding in Storm Lab

Roanoke, VA (KRNK), 00:00Z

3.1 hours after it, 64 km from the path. March 21, 1998.

Skew-T log-pSkew-T log-p diagram, Roanoke, VA at 00:00Z on 1998-03-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel lifted from the surface. Mixed-layer CAPE 440 joules per kilogram, CIN -13, lifted condensation level 713 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, Roanoke, VA at 00:00Z on 1998-03-21The 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 178 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
440 J/kg
Mixed-layer CIN
-13 J/kg
Surface CAPE
13 J/kg
Mixed-layer LCL
713 m above ground
0-6 km bulk shear
42 kt
0-1 km bulk shear
36 kt
0-1 km storm-relative helicity
178 m²/s²
0-3 km storm-relative helicity
238 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.9
0-3 km lapse rate
6.0 K/km

Open this sounding in Storm Lab

The radar

The Roanoke radar (KFCX), 70 km away, was scanning. The volume nearest the touchdown began at 20:57 UTC.

Open the radar archive at this moment, over the track

Reflectivity and velocity, decoded from the Level II archive in the browser. Volumes take a few seconds to open the first time.

This ground now

The live radar over the trackEvery 1998 tornado in VirginiaEvery tornado in Virginia since 1950Warnings in force in Virginia nowThe forecast where you are

The other tornadoes of March 20, 1998

11 more were confirmed in the United States that day.

DateTimeRatingWherePath (mi)Width (yd)DeathsInjuriesDamage
March 206:25 AM ESTF3Hall, GA4.010012171$20 million
March 202:42 PM ESTF0Mecklenburg, NC0.130
March 203:14 PM ESTF1Stokes, NC1.5303$100,000
March 203:25 PM ESTF3Rockingham, NC12.0300227$34 million
March 206:15 PM ESTF0Wake, NC0.130
March 206:30 PM ESTF2Durham, NC2.51001$600,000
March 206:40 PM ESTF2Wake, NC1.51002$650,000
March 206:45 PM ESTF0Wake, NC0.230$10,000
March 206:55 PM ESTF2Granville, NC1.5100$100,000
March 207:35 PM ESTF1Franklin, NC0.150$50,000
March 208:45 PM ESTF1Robeson, NC0.5301$20,000

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.