EF1 tornado, Green to Langley Arpt, Oklahoma, April 25, 2017

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, 2017

Touchdown

11:46 PM CDT (04:46 UTC)

Lifted

11:57 PM CDT (04:57 UTC)

On the ground

11 minutes

Path length

10.2 miles (16.4 km)

Path width

400 yards (366 m)

Deaths

0

Injuries

0

Property damage

$25,000

County

Mayes County

Touchdown point

36.379, -95.209

Lift-off point

36.485, -95.085

Record number

1704252246-01

105 damage points were recorded along this path by NWS TSA, in the Damage Assessment Toolkit the survey teams carry. The strongest indicator was rated EF1. The highest wind the damage implies is 107 mph.

• multiple snapped and uprooted trees
• uprooted trees down 180 degrees different
• convergent tree damage here
• multiple trees snapped here

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

Severe thunderstorms developed along and ahead of a cold front that moved into eastern Oklahoma during the evening of the 25th. The storms moved eastward across the area through the early morning hours of the 26th, resulting in three tornadoes, hail up to baseball size, and damaging wind. Locally heavy rainfall of three to four inches resulted in flash flooding.

A tornado destroyed a mobile home, damaged several homes, destroyed outbuildings, snapped and uprooted numerous trees, and blew down power poles. The tornado developed north of the W 450 Road and west of the N 429 Road and moved northeast until it crossed the W 420 Road. It then curved to the north until it dissipated north of the W 400 Road. Based on this damage, maximum estimated wind in the tornado was 95 to 105 mph.

A tornado snapped and uprooted numerous trees, destroyed outbuildings, damaged homes, and blew down power poles. The tornado developed north of the W 430 Road and west of the N 428 Road. It moved northeast until it crossed the W 420 Road, then moved more easterly until it dissipated. Based on this damage, maximum estimated wind in the tornado was 100 to 110 mph.

A tornado uprooted numerous trees, blew down power poles, and destroyed several outbuildings. Based on this damage, maximum estimated wind in the tornado was 90 to 100 mph.

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

6 minutes of warning. NWS TSA issued a tornado warning for this county at 04:40 UTC, 6 minutes before the tornado touched down, in force until 05:00 UTC.

The county was under a severe thunderstorm watch, issued at 23:00 UTC and running to 05:57 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 Enhanced Risk, with a 0.05 chance of a tornado within 25 miles. The outlook in force was issued at 00:49 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.

Claremore Regional Airport (GCM), 34 km from the path, in the two hours either side.

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

The Tulsa radar (KINX), 47 km away, was scanning. The volume nearest the touchdown began at 04:46 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 2017 tornado in OklahomaEvery tornado in Oklahoma since 1950Warnings in force in Oklahoma nowThe forecast where you are

4 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.