EF0 tornado, Haley, Tennessee, September 17, 2012

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

September 17, 2012

Touchdown

4:02 PM CDT (21:02 UTC)

Lifted

4:03 PM CDT (21:03 UTC)

On the ground

1 minutes

Path length

0.7 miles (1.0 km)

Path width

100 yards (91 m)

Deaths

0

Injuries

0

Property damage

$50,000

County

Bedford County

Touchdown point

35.447, -86.337

Lift-off point

35.454, -86.329

Record number

1209171502-01

2 damage points were recorded along this path by NWS OHX, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 80 mph.

• Barn collapsed per Google Earth high resolution satellite imagery

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

As an upper level low pressure system approached southern and eastern portions of Middle Tennessee during the afternoon through evening hours on Monday, September 17th, low level wind fields strengthened. Along with increased moisture and instability across these portions of the mid state also, severe thunderstorms developed, resulting in thunderstorm wind damage, along with several funnel cloud reports, including an EF0 tornado in Bedford County, impacting several counties in the mid state. Associated impacts of flash flooding events lasted even into the early morning hours on Tuesday, September 18th.

An EF0 tornado with an estimated peak wind speed of 80 mph touched down at a residence along U.S. Highway 41A approximately 1/2 mile east of the U.S. Highway 41A and Normandy Road intersection. Dozens of trees were snapped and uprooted at this location and the residence suffered roof damage with many shingles blown off. The tornado then crossed U.S. Highway 41A and Shofner Road before lifting.

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

7 minutes of warning. NWS OHX issued a tornado warning for this county at 20:55 UTC, 7 minutes before the tornado touched down, in force until 21:30 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 General Thunderstorms Risk, with a 0.02 chance of a tornado within 25 miles. 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.

Tullahoma (THA), 11 km from the path, in the two hours either side.

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

The Northeast Alabama radar (KHTX), 62 km away, was scanning. The volume nearest the touchdown began at 21:02 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 2012 tornado in TennesseeEvery tornado in Tennessee since 1950Warnings in force in Tennessee nowThe forecast where you are

2 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.