EF2 tornado, Helton to Lancaster, Tennessee, December 23, 2015

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 mph

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

3. EF2111 to 135 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. 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

EF2

Date

December 23, 2015

Touchdown

10:14 PM CST (04:14 UTC)

Lifted

10:24 PM CST (04:24 UTC)

On the ground

10 minutes

Path length

8.4 miles (13.5 km)

Path width

250 yards (229 m)

Deaths

0

Injuries

0

Property damage

$400,000

Counties

DeKalb and Smith counties

Touchdown point

36.061, -85.971

Lift-off point

36.122, -85.841

Record number

1512232214-01

10 damage points were recorded along this path by NWS OHX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF2. The highest wind the damage implies is 125 mph.

• Roof completely removed. exterior walls removed on 2 sides. walls toe nailed in only. car port and decking around home removed completely.
• Several large trees snapped. Minor roof damage to home.
• Path widens to 150-200 yards. Just tree damage here
• Destruction of cinder block garage. Outer skin of roof removed from log cabin home.

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

An unusually powerful upper level trough moved across the eastern United States on December 23, 2015, spawning widespread severe weather from the Gulf Coast to the Great Lakes. Several tornadic supercell thunderstorms developed across northern Mississippi and western Tennessee, which then moved rapidly east-northeastward at up to 70 mph across Middle Tennessee during the evening hours on December 23. These storms produced 4 long-track tornadoes that caused 2 deaths and 7 reported injuries. Only 7 tornadoes had been previously recorded across Middle Tennessee in the month of December from the 1800s through 2014, easily making this the largest and worst December tornado outbreak in Middle Tennessee history.||In addition to the tornadoes, several reports of wind damage, large hail, and flash flooding were received. Some of the worst flash flooding occurred in Maury County, where 3 teenagers drowned in a submerged vehicle on Carters Creek Pike.

This EF2 tornado touched down on Helton Creek just southwest of Dry Branch Road. At this location, the path width was narrow at 50-75 yards wide but snapped numerous trees and did some minor roof damage to a home. The tornado continued to the east-northeast snapping large trees and doing minor roof damage to a home on Corley Road. As the tornado crossed over TN Highway 264 and Smith Fork Creek it widened to 250 yards. It was here where it produced the greatest damage. The roof and two exterior walls were removed, along with its carport and 2 covered porches. Based on the exterior walls only being toe-nailed in place, it was decided that the maximum wind speed would be reduced slightly to a maximum of 125 mph. The tornado continued east-northeast destroying a cinder block garage and causing moderate roof damage to a log cabin home on Maynard Hollow Lane. At the end of the path, the tornado snapped numerous trees in Lancaster where the path width had narrowed to 100 yards. No damage was found beyond Lancaster.||This is the first tornado on record to occur in both DeKalb County and Smith County in the month of December.

This EF2 tornado touched down on Helton Creek just southwest of Dry Branch Road. At this location, the path width was narrow at 50-75 yards wide but snapped numerous trees and did some minor roof damage to a home. The tornado continued to the east-northeast snapping large trees and doing minor roof damage to a home on Corley Road. As the tornado crossed over TN Highway 264 and Smith Fork Creek it widened to 250 yards. It was here where it produced the greatest damage. The roof and two exterior walls were removed, along with its carport and 2 covered porches. Based on the exterior walls only being toe-nailed in place, it was decided that the maximum wind speed would be reduced slightly to a maximum of 125 mph. The tornado continued east-northeast destroying a cinder block garage and causing moderate roof damage to a log cabin home on Maynard Hollow Lane. At the end of the path, the tornado snapped numerous trees in Lancaster where the path width had narrowed to 100 yards. No damage was found beyond Lancaster.||This is the first tornado on record to occur in both DeKalb County and Smith County in the month of December.

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.

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, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 01:07 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.

Sparta (SRB), 34 km from the path, in the two hours either side.

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

The Nashville radar (KOHX), 61 km away, was scanning. The volume nearest the touchdown began at 04:12 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 2015 tornado in TennesseeEvery tornado in Tennessee since 1950Warnings in force in Tennessee nowThe forecast where you are

30 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.