EF1 tornado, Devine Muni Arpt to Pearson, Texas, March 19, 2012

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

March 19, 2012

Touchdown

8:05 PM CDT (01:05 UTC)

Lifted

8:20 PM CDT (01:20 UTC)

On the ground

15 minutes

Path length

7.0 miles (11.3 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

County

Medina County

Touchdown point

29.182, -98.841

Lift-off point

29.271, -98.892

Record number

1203191905-01

A deep upper level trough of low pressure and strong cold front moved into an area of deep boundary layer moisture. The system initially produced supercell thunderstorms which produced several tornadoes and large hail. There storms then transitioned into a quasi-linear convective system that produced heavy rainfall and flooding.

A supercell thunderstorm moved through southeastern Medina County and into southwestern Bexar County and produced three tornadoes. The first tornado touched down in Devine, the second in Natalia, and the third in Bexar County. The tornadoes in Medina County destroyed 14 homes, caused major damage on 11 others, and minor damage on seven. Ten people were injured by these storms in Medina County.

A supercell thunderstorm moved through southeastern Medina County and into southwestern Bexar County and produced three tornadoes. The first tornado touched down in Devine, the second in Natalia, and the third in Bexar County. The tornadoes in Medina County destroyed 14 homes, caused major damage on 11 others, and minor damage on seven. Ten people were injured by these storms in Medina County.

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

21 minutes of warning. NWS EWX issued a tornado warning for this county at 00:44 UTC, 21 minutes before the tornado touched down, in force until 01:15 UTC.

The county was under a tornado watch, issued at 19:40 UTC and running to 02:53 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 00:59 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.

Castroville (CVB), 13 km from the path, in the two hours either side.

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

The Austin/San Antonio radar (KEWX), 97 km away, was scanning. The volume nearest the touchdown began at 01:04 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 2012 tornado in TexasEvery tornado in Texas since 1950Warnings in force in Texas nowThe forecast where you are

9 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.