EF0 tornado, Troy Skypark Arpt to Alcony, Ohio, May 27, 2019

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

May 27, 2019

Touchdown

11:08 PM EDT (03:08 UTC)

Lifted

11:09 PM EDT (03:09 UTC)

On the ground

1 minutes

Path length

1.1 miles (1.7 km)

Path width

50 yards (46 m)

Deaths

0

Injuries

0

Property damage

$10,000

County

Miami County

Touchdown point

40.007, -84.059

Lift-off point

40.010, -84.040

Record number

1905272108-01

Thunderstorms developed during the evening hours along a warm front lifting slowly north across the region. Many of the thunderstorms produced tornadoes, including a few strong to violent tornadoes.

Damage from this tornado is believed to have begun at a residence on Monroe Concord Road, where minor tree damage was observed, along with damage to a shed. Further to the northeast, at a property on Peters Road, just north of Interstate 75, an outbuilding suffered partial loss of some roofing material.||Damage appeared to be most significant in a subdivision south of Swailes Road. Dozens of trees were downed or damaged within this subdivision, which included Linconshire Drive, Fiesta Drive, Greenlawn Drive, and Windmere Drive. Although tree damage was fairly widespread, there were no obvious signs of structural damage to any of the homes.||Just west of South County Road 25A, a barn was sustained a partial roof loss. Several trees were also downed at this property.||Minor tree damage was observed further to the northeast along State Route 202, Knoop Road, and South Childrens Home Grayson Road. The tornado is believed to have dissipated somewhere near South Childrens Home Grayson Road, south of State Route 41.||Damage was consistent with an EF0 tornado with maximum winds of 70 mph.

A very brief/weak tornado touched down just south of Alcony along State Highway 41 and moved northeast for about a mile before crossing State Highway 41 and dissipating just before the Clark County line.||The path featured intermittent tree damage consisting of a few uprooted trees, and a few trees snapped off high above the ground. A fence row near the end of the tornado track had collected roofing material and tree debris from an unknown source, indicating that a roof and tree limbs along the path likely were partially removed and lifted downstream. The tornado may not have been in full contact with the ground over the entire path length, but there was a clear path of sporadic tree damage that aligned with strong rotation seen at very low levels (100 feet AGL) on the Dayton Terminal Doppler Weather Radar (TDAY) which is located just a few miles west of the location.||Based on the damage, the maximum wind speeds were estimated to be around 70 mph.

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

23 minutes of warning. NWS ILN issued a tornado warning for this county at 02:45 UTC, 23 minutes before the tornado touched down, in force until 03:15 UTC.

The county was under a tornado watch, issued at 00:21 UTC and running to 04:34 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 01:18 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.

Dayton (DAY), 18 km from the path, in the two hours either side.

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

The Cincinnati radar (KILN), 68 km away, was scanning. The volume nearest the touchdown began at 03:09 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 2019 tornado in OhioEvery tornado in Ohio since 1950Warnings in force in Ohio nowThe forecast where you are

62 more were confirmed in the United States that day.

All 63 of them

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.