EF1 tornado, Tyrone, Oklahoma, June 11, 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

June 11, 2011

Touchdown

7:11 PM CDT (00:11 UTC)

Lifted

7:25 PM CDT (00:25 UTC)

On the ground

14 minutes

Path length

2.1 miles (3.4 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

Property damage

$20,000

County

Texas County

Touchdown point

36.981, -101.053

Lift-off point

36.976, -101.016

Record number

1106111811-01

4 damage points were recorded along this path by NWS AMA, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 90 mph.

• THE TORNADO FIRST TOUCHED DOWN NEAR THE INTERSECTION OF MILE 54 ROAD\nAND B ROAD NORTHEAST OF TYRONE AROUND 711 PM CDT. THE TORNADO WAS ON\nTHE GROUND FOR ABOUT 2.1 MILES WITH A MAXIMUM WIDTH OF 50 YARDS. THE\nMAXIMUM WIND SPEEDS WERE AROUND 90 MPH. THE TORNADO DISSIPATED JUST\nSOUTHEAST OF THE INTERSECTION OF MILE 56 AND B ROAD AROUND 725 PM\nCDT.
• Shed/Outbuilding overturned and destroyed after being thrown 50 feet. The majority of the roof and outside walls were never found.
• Overturning of outbuilding.
• Shingles missing off of house.

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

Severe thunderstorms produced large hail, thunderstorm wind gusts and an isolated tornado in the central and eastern Oklahoma Panhandle during the evening hours. Although no injuries or fatalities were reported, the tornado and thunderstorm wind gusts in the central and eastern Oklahoma Panhandle did result in damage.

An official National Weather storm survey determined that the tornado touched down near the intersection of Mile 54 Road and B Road about two miles north northeast of Tyrone Oklahoma in Texas County around 1811 CST. The tornado was on the ground for about two and one tenth miles with a maximum path width of fifty yards. The roof was removed and the windows were broken on a manufactured home in Wesley Acres. There were also a few outbuildings which were destroyed. The maximum wind speeds of the tornado were estimated to be seventy-eight knots. The tornado dissipated just southeast of the intersection of Mile 56 Road and B Road around 1825 CST. There were no reports of injuries or fatalities.

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

16 minutes of warning. NWS AMA issued a tornado warning for this county at 23:55 UTC, 16 minutes before the tornado touched down, in force until 00:30 UTC.

The county was under a severe thunderstorm watch, issued at 20:42 UTC and running to 02:23 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 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 20:00 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 Dodge City radar (KDDC), 128 km away, was scanning. The volume nearest the touchdown began at 00:12 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 OklahomaEvery tornado in Oklahoma since 1950Warnings in force in Oklahoma nowThe forecast where you are

7 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.