EF1 tornado, Silverton, Texas, April 1, 2013

1. EF065 to 85 mph

   Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.

2. EF186 to 110 mphthis tornado

   Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.

3. EF2111 to 135 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. EF3136 to 165 mph

   Severe damage. Whole stories of well-built houses destroyed, large buildings badly damaged, trains overturned, trees debarked, heavy cars lifted and thrown.

5. EF4166 to 200 mph

   Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.

6. EF5over 200 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.

Rating

EF1

Date

April 1, 2013

Touchdown

4:40 PM CDT (21:40 UTC)

Lifted

4:45 PM CDT (21:45 UTC)

On the ground

5 minutes

Path length

1.8 miles (3.0 km)

Path width

100 yards (91 m)

Deaths

0

Injuries

0

Property damage

$5,000

County

Briscoe County

Touchdown point

34.432, -101.225

Lift-off point

34.424, -101.187

Record number

1304011540-01

6 damage points were recorded along this path by NWS LUB, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 109 mph.

• roofing material stripped off
• wooden power lines leaning to the east

Survey points are preliminary and are the raw material the published rating was built from. Source: NWS Damage Assessment Toolkit.

In advance of an unseasonably cold airmass, scattered thunderstorms erupted early this afternoon in the far south-central Texas Panhandle near the intersection of a dryline and cold front. More than adequate wind shear and instability allowed for many of these storms to become severe while spreading southeast into the Rolling Plains through the early evening hours. In addition to producing locally heavy rains, damaging downbursts, and hail as large as two inches in diameter, one of these supercell storms produced a five-minute EF1 tornado in rural areas southeast of Silverton. This tornado damaged a metal shed, one center pivot irrigator, and toppled four power poles.

A supercell thunderstorm produced an EF1 tornado in rural areas about 4.5 miles southeast of Silverton. This tornado damaged several power poles and one center pivot irrigation system. An NWS storm survey the following day discovered damage consistent with EF1 wind speeds. Video evidence from a storm chaser showed that very strong rear flank downdraft winds well outside the periphery of the tornado damaged the roof of a barn south of the tornado during its rope-out stage.

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

No tornado warning for this county appears in the archive as in force at the moment the tornado touched down. One was issued for the county at another hour that day.

The county was under a severe thunderstorm watch, issued at 20:36 UTC and running to 00:10 UTC.

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 Storm Prediction Center had this point in a Slight Risk. The outlook in force was issued at 20:01 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 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.

Plainview (PVW), 55 km from the path, in the two hours either side.

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

The Amarillo radar (KAMA), 101 km away, was scanning. The volume nearest the touchdown began at 21:40 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.

Local storm reports within 60 km of the path, in the three hours either side.

From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.

The live radar over the trackEvery 2013 tornado in TexasEvery tornado in Texas since 1950Warnings in force in Texas nowThe forecast where you are

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.

NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.