EF1 tornado, Thornburg to Perryville, Arkansas, April 25, 2011

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

April 25, 2011

Touchdown

6:21 PM CDT (23:21 UTC)

Lifted

6:33 PM CDT (23:33 UTC)

On the ground

12 minutes

Path length

6.0 miles (9.6 km)

Path width

300 yards (274 m)

Deaths

0

Injuries

0

Property damage

$700,000

County

Perry County

Touchdown point

34.952, -92.833

Lift-off point

35.019, -92.766

Record number

1104251721-01

From the 24th through the 27th, the arrival of a slow-moving cold front and several low pressure areas aloft triggered several rounds of thunderstorms. Tornadoes, severe storms, and flash flooding resulted. Widespread areal flooding followed the flash flooding. Some of this flooding was due to heavy rain, while some of it was caused by water from rivers, creeks, and bayous backing up onto the land. On the evening of the 25th, devastating tornadoes affected several areas in central Arkansas. More than 140,000 electric customers in Arkansas lost power. Heavy rains during this period were the beginning of the Great Flood of 2011 in Arkansas. Much of the flooding lasted well into May, and some even continued all the way to late June.

The worst damage from this tornado occurred at Heifer International's ranch. Several buildings had their roofs torn off and thrown into adjacent fields and several hay barns were destroyed. No animals at the ranch were harmed. Otherwise, several houses had major roof damage and some other houses had lesser amounts of roof damage. Dozens of trees were snapped off or blown over. Several vehicles were badly damaged by falling trees. Barns and outbuildings were damaged. A number of power lines were blown down.

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

40 minutes of warning. NWS LZK issued a tornado warning for this county at 22:41 UTC, 40 minutes before the tornado touched down, in force until 23:30 UTC.

The county was under a tornado watch, issued at 20:25 UTC and running to 01:48 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 Moderate Risk, with a 0.15 chance of a tornado within 25 miles, in the hatched area where significant tornadoes were expected. The outlook in force was issued at 19:48 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 Little Rock radar (KLZK), 52 km away, was scanning. The volume nearest the touchdown began at 23:20 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 2011 tornado in ArkansasEvery tornado in Arkansas since 1950Warnings in force in Arkansas nowThe forecast where you are

45 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.