EF0 tornado, Bland Lake to Calgary, Texas, March 11, 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

March 11, 2012

Touchdown

2:15 PM CDT (19:15 UTC)

Lifted

2:20 PM CDT (19:20 UTC)

On the ground

5 minutes

Path length

3.6 miles (5.8 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

Property damage

$10,000

County

San Augustine County

Touchdown point

31.573, -94.127

Lift-off point

31.617, -94.094

Record number

1203111315-01

2 damage points were recorded along this path by NWS SHV, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF0. The highest wind the damage implies is 65 mph.

• roof peeled back on some chicken houses

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

A deep upper level trough across the Four Corners Region of the United States began ejecting out into the Southern and Central Plains during the afternoon, evening and overnight hours of Sunday, March 11th. This storm system produced some severe thunderstorms, some of which produced damaging winds, isolated tornadoes and large hail. Excessive heavy rainfall also accompanied the storm system with some flash flooding reported across portions of the region.

An EF0 tornado touched down 5 miles northwest of San Augustine, Tx. and tracked north northeast before lifting just south of the San Augustine/Shelby County Texas line. The initial touchdown was just east of Hwy. 96 and west of FMm 3230 where a larger tree was uprooted. Large limbs and tin from a chicken house was peeled back near FM. 1279. The path width was 50 yards wide with a path length of near 4 miles. Maximum winds were estimated near 70 mph.

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

3 minutes of warning. NWS SHV issued a tornado warning for this county at 19:12 UTC, 3 minutes before the tornado touched down, in force until 20:00 UTC.

The county was under a tornado watch, issued at 16:56 UTC and running to 21:03 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, with a 0.10 chance of a tornado within 25 miles. The outlook in force was issued at 16:09 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.

The Shreveport radar (KSHV), 98 km away, was scanning. The volume nearest the touchdown began at 19:14 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 TexasEvery tornado in Texas since 1950Warnings in force in Texas 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.