EF0 tornado, Perth, Mississippi, January 2, 2017

1. EF065 to 85 mphthis tornado

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

2. EF186 to 110 mph

   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

EF0

Date

January 2, 2017

Touchdown

1:02 PM CST (19:02 UTC)

Lifted

1:05 PM CST (19:05 UTC)

On the ground

3 minutes

Path length

3.9 miles (6.3 km)

Path width

250 yards (229 m)

Deaths

0

Injuries

0

Property damage

$50,000

County

Jefferson County

Touchdown point

31.667, -90.935

Lift-off point

31.700, -90.881

Record number

1701021302-01

11 damage points were recorded along this path by NWS JAN, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 94 mph.

• several trees down, lines down & pole snapped.
• multiple trees down, sheds damaged.
• Trees damaged beginning here.

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

As a warm front was draped across the region, an upper level disturbance moved across and brought heavy rain and some severe storms during the morning. The storm system developed further during the afternoon and a squall line formed ahead of an approaching cold front. This helped to bring tornadoes and additional severe weather to the region during the afternoon hours.

This tornado touched down along Perth Road and tracked northeast across Highway 28 in central Jefferson County. Damage was only to trees with many limbs broken and a couple dozen snapped or uprooted trees. After crossing Highway 28, the tornado mainly tracked just to the south of Old 20 Road for a couple of miles before dissipating. Maximum estimated winds were 85 mph.

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

43 minutes of warning. NWS JAN issued a tornado warning for this county at 18:19 UTC, 43 minutes before the tornado touched down, in force until 19:15 UTC.

The county was under a tornado watch, issued at 17:22 UTC and running to 20:16 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 Enhanced Risk, with a 0.10 chance of a tornado within 25 miles. The outlook in force was issued at 16:28 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 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.

Natchez/Hardy(Awos) (HEZ), 38 km from the path, in the two hours either side.

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

The Jackson/Brandon,MS radar (KDGX), 110 km away, was scanning. The volume nearest the touchdown began at 19:04 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 2017 tornado in MississippiEvery tornado in Mississippi since 1950Warnings in force in Mississippi nowThe forecast where you are

38 more were confirmed in the United States that day.

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.