Tornadoes · United States · Oklahoma · 2017
EF0 tornado, Byng, Oklahoma, April 25, 2017
This EF0 tornado ran 0.7 miles across Pontotoc County on April 25, 2017, touching down at 10:13 PM CDT and reaching 50 yards wide. It killed nobody, and did $4,000 of property damage.
The rating scale
Tracks are drawn in the color of the rating. The Enhanced Fujita scale rates the damage rather than measuring the wind: the speeds are what that damage is taken to imply.
EF065 to 85 mphthis tornado
Light damage. Surface peeled off some roofs, gutters and siding damaged, branches broken, shallow-rooted trees pushed over.
EF186 to 110 mph
Moderate damage. Roofs badly stripped, mobile homes overturned or badly damaged, exterior doors lost, windows broken.
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.
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.
EF4166 to 200 mph
Devastating damage. Well-built houses leveled, structures with weak foundations moved some distance, cars thrown and large missiles generated.
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.
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.
The record
- Rating
- EF0
- Date
- April 25, 2017
- Touchdown
- 10:13 PM CDT (03:13 UTC)
- Lifted
- 10:14 PM CDT (03:14 UTC)
- On the ground
- 1 minutes
- Path length
- 0.7 miles (1.1 km)
- Path width
- 50 yards (46 m)
- Deaths
- 0
- Injuries
- 0
- Property damage
- $4,000
- County
- Pontotoc County
- Touchdown point
- 34.930, -96.694
- Lift-off point
- 34.932, -96.683
- Record number
- 1704252113-01
What the Weather Service recorded
As a cold front swept through into abundant moisture on the evening of the 25th, storms fired along and near the front with several of them becoming severe.
Trees and power poles were damaged in extreme northern Pontotoc County.
From NOAA NCEI's Storm Events Database, the narrative the local forecast office wrote for Storm Data.
The warnings
No tornado warning for this county appears in the archive as in force at the moment the tornado touched down.
The county was under a severe thunderstorm watch, issued at 23:00 UTC and running to 07:00 UTC.
| Issued (UTC) | Expired | Product | Office |
|---|---|---|---|
| 23:00 UTC | 07:00 UTC | Severe Thunderstorm Watch | OUN |
| 02:42 UTC | 03:30 UTC | Severe Thunderstorm Warning | OUN |
| 04:02 UTC | 04:45 UTC | Severe Thunderstorm Warning | OUN |
| 04:45 UTC | 05:27 UTC | Severe Thunderstorm Warning | OUN |
| 10:40 UTC | 13:45 UTC | Flood Advisory | OUN |
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 forecast that day
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 00:49 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 air that afternoon
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.
Norman, OK (KOUN), 00:00Z
3.2 hours before the tornado, 72 km from the path. April 26, 2017.
- Mixed-layer CAPE
- 1456 J/kg
- Mixed-layer CIN
- -53 J/kg
- Surface CAPE
- 3280 J/kg
- Mixed-layer LCL
- 1711 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 173 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 10.8
- 0-3 km lapse rate
- 8.3 K/km
Norman, OK (KOUN), 12:00Z
8.8 hours after it, 72 km from the path. April 26, 2017.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- 0 J/kg
- Surface CAPE
- 7 J/kg
- Mixed-layer LCL
- 566 m above ground
- 0-6 km bulk shear
- 81 kt
- 0-1 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 193 m²/s²
- 0-3 km storm-relative helicity
- 417 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
- 0-3 km lapse rate
- 3.4 K/km
The surface observations
Ada_municipal_airport (ADH), 14 km from the path, in the two hours either side.
| Time (UTC) | Temp (°F) | Dew point (°F) | Wind | Gust (kt) | Pressure (mb) | Weather |
|---|---|---|---|---|---|---|
| 01:15 UTC | 73.4 | 64.4 | 160° 12 kt | 17 | 995.3 | |
| 01:35 UTC | 73.4 | 64.4 | 150° 11 kt | 994.6 | ||
| 01:55 UTC | 73.4 | 64.4 | 150° 12 kt | 17 | 994.9 | |
| 02:15 UTC | 71.6 | 66.2 | 150° 13 kt | 995.3 | ||
| 02:35 UTC | 73.4 | 66.2 | 160° 11 kt | 995.9 | VCTS | |
| 02:55 UTC | 71.6 | 66.2 | 160° 13 kt | 17 | 995.3 | -TSDZ |
| 03:15 UTC | 71.6 | 66.2 | 160° 13 kt | 19 | 995.3 | -TSRA |
| 03:35 UTC | 71.6 | 66.2 | 150° 6 kt | 15 | 995.3 | TS |
| 03:55 UTC | 71.6 | 66.2 | 170° 6 kt | 995.6 | VCTS | |
| 04:15 UTC | 71.6 | 68 | 0° 0 kt | 995.9 | TS | |
| 04:35 UTC | 71.6 | 68 | 250° 8 kt | 996.6 | -TSRA | |
| 04:50 UTC | 66.2 | 62.6 | 260° 7 kt | 17 | 998.3 | +TSRA |
From the Iowa Environmental Mesonet's archive of airport observations.
The radar
The Norman radar (KTLX), 70 km away, was scanning. The volume nearest the touchdown began at 03:10 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.
What was reported nearby
Local storm reports within 60 km of the path, in the three hours either side.
| Time (UTC) | Report | Where | County | Remark |
|---|---|---|---|---|
| 03:40 UTC | TSTM WND DMG | 5 W Etowah | Cleveland, OK | TREE DAMAGE REPORTED NEAR 120TH AVENUE AND MAGUIRE ROAD. |
| 03:42 UTC | HAIL 1.5 | Holdenville | Hughes, OK | |
| 03:43 UTC | HAIL 1 | 3 E Lake Thunderbird | Cleveland, OK | |
| 03:50 UTC | TSTM WND DMG | 1 Ene Holdenville | Hughes, OK | AWNING DESTROYED AT WALMART. TREE DOWNED. POSSIBLE TORNADO DAMAGE. |
| 03:50 UTC | TORNADO | 1 Ene Holdenville | Hughes, OK | NUMEROUS TREES DOWNED. WINDOWS BLOWN OUT. ROOFS BLOWN OFF. AIR CONDITIONER UNITS BLOWN OFF AT WALMART. AWNING DESTROYED AT WALMART. MOST DAMAGE OCCURRED FROM NEAR JOHN STREET ON THE SOUTH SIDE OF TOWN TO THE WALMART NEAR |
| 03:57 UTC | HAIL 2 | Brooksville | Pottawatomie, OK | |
| 04:23 UTC | HAIL 1 | 8 Ne Stratford | Pontotoc, OK | |
| 04:25 UTC | HAIL 1.75 | 1 Wnw Vanoss | Pontotoc, OK | |
| 04:32 UTC | HAIL 1 | 6 Ene Vanoss | Pontotoc, OK | |
| 04:39 UTC | HAIL 1.75 | 7 Ne Vanoss | Pontotoc, OK | |
| 04:40 UTC | HAIL 1.25 | 3 E Vanoss | Pontotoc, OK | HALF DOLLAR SIZE HAIL REPORTED NEAR PICKETT. |
From the Iowa Environmental Mesonet's archive of National Weather Service local storm reports.
This ground now
The live radar over the trackEvery 2017 tornado in OklahomaEvery tornado in Oklahoma since 1950Warnings in force in Oklahoma nowThe forecast where you are
The other tornadoes of April 25, 2017
4 more were confirmed in the United States that day.
What this means
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.
Sources
NOAA Storm Prediction Center tornado database, 1950-2025, the official record kept by NOAA's Storm Prediction Center.