EF0 tornado, Box Butte Reservoir, Nebraska, June 11, 2013

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

June 11, 2013

Touchdown

8:47 PM MDT (02:47 UTC)

Lifted

8:52 PM MDT (02:52 UTC)

On the ground

5 minutes

Path length

0.8 miles (1.2 km)

Path width

40 yards (37 m)

Deaths

0

Injuries

0

County

Dawes County

Touchdown point

42.636, -103.056

Lift-off point

42.636, -103.041

Record number

1306112047-01

A supercell thunderstorm spawned a EF1 tornado 19 miles southwest of Chadron in Dawes County. The tornado track was a mile long and lasted seven minutes before dissipating. Ten minutes later, the same storm produced a brief EF0 tornado southwest of Red Cloud Campground.

The National Weather Service in Cheyenne rated the June 11 2013 Dawes County Nebraska tornado as EF1 on the Enhanced Fujita Scale with maximum 3 second wind gusts of 110 mph. The tornado touched down 19 miles south-southwest of Chadron, just west of the T intersection of Hough Road. The tornado moved east, then slightly southeast, dissipating seven minutes later just north of Hough Road. The damage path length and width were estimated at one mile and 40 yards, respectively. At least 16 structures were damaged, with at least eight outbuildings destroyed. Numerous trees and telephone poles were snapped and two horse trailers were thrown several hundred feet. Two distinct swirl marks were located along the damage path, estimated around 12 feet in diameter. The supercell thunderstorm associated with the tornado produced very little rain or hail, but several cloud to ground lightning strikes near the tornado.

A weak tornado touched down near the intersection of Table Road and Dead Horse Road. The tornado moved east across open country for about three-quarters of a mile before dissipating. No damage was reported.

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 Slight Risk, with a 0.02 chance of a tornado within 25 miles. The outlook in force was issued at 00:58 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.

Chadron (CDR), 23 km from the path, in the two hours either side.

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

The Rapid City radar (KUDX), 166 km away, was scanning. The volume nearest the touchdown began at 02:45 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 2013 tornado in NebraskaEvery tornado in Nebraska since 1950Warnings in force in Nebraska nowThe forecast where you are

1 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.