A slow moving low pressure system resulted in thunderstorm development through the late afternoon. The thunderstorms continued into the evening hours, producing locally heavy rainfall and isolated tornadoes.

Tornado in CLARK, OHIO
From 24-MAY-17 20:12:00 to 24-MAY-17 20:16:00 (EST-5)
Location: CRYSTAL LAKES
Tornado F-scale: EF0
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado initially touched down about a mile north of Fairborn in Greene County at 2006EST before moving northwest and entering Clark County about 2.3 miles south-southwest of Crystal Lakes at 2012EST.
Tornado damage was found along Lower Valley Pike near Princeton Drive, just southeast of the Interstate 70 and State Route 235 interchange. The tornado then continued in a north-northwest path along and either side of Princeton Drive. Several manufactured homes sustained roof and siding damage, along with carports and awnings destroyed. Several large trees were damaged, either uprooted or with large branches snapped off. Two large trees fell on and destroyed two homes on Cordova Drive.
The damage quickly lessened in strength further to the northwest with minimal damage along Jason Drive and no evidence of damage by Amy Dee Lane.

Tornado in WARREN, OHIO
From 24-MAY-17 18:47:00 to 24-MAY-17 18:48:00 (EST-5)
Location: HARVEYSBURG
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Based on radar data, video evidence and eyewitness reports, a tornado appeared to briefly touch down about 4 miles NNE of Harveysburg in extreme northeast Warren County. No damage was observed so the maximum winds were estimated to be 50 mph, equivalent to a weak EF0 tornado.

Tornado in GREENE, OHIO
From 24-MAY-17 20:06:00 to 24-MAY-17 20:12:00 (EST-5)
Location: FAIRBORN
Tornado F-scale: EF0
Property damage: 2.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado first touched down about a mile north of Fairborn in Greene County where some minor tree damage occurred in Fairborn Park. The tornado passed over the northern end of Wright Patterson Air Force Base with some additional minor tree damage located along Osborn Road in extreme northwest Greene County. The tornado then moved into extreme southeast Clark County, about 2.1 miles north-northeast of Wright Patterson Air Force Base, before ending about 1.9 miles southwest of Crystal Lakes at 2016EST.

Flash Flood in MERCER, OHIO
From 25-MAY-17 00:00:00 to 25-MAY-17 00:30:00 (EST-5)
Location: CHATTANOOGA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

State Route 707 near Wabash Road was closed due to high water, leading to a water rescue.

Flash Flood in BUTLER, OHIO
From 24-MAY-17 18:30:00 to 24-MAY-17 19:00:00 (EST-5)
Location: NORTH HAMILTON ARPT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

A railroad was washed out due to flooding along Sevenmile Creek.

Flash Flood in HAMILTON, OHIO
From 24-MAY-17 18:30:00 to 24-MAY-17 19:00:00 (EST-5)
Location: MIAMI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Taylor Creek overflowed its bank onto Harrison Avenue near the intersection with Springdale Road.

Flash Flood in HAMILTON, OHIO
From 24-MAY-17 17:45:00 to 24-MAY-17 18:15:00 (EST-5)
Location: TAYLORS CREEK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rapidly moving water was observed over a portion of Sheed Road.

Flash Flood in HAMILTON, OHIO
From 24-MAY-17 17:30:00 to 24-MAY-17 18:00:00 (EST-5)
Location: DENT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Water was reported rushing over Race Road near West Fork Road.

Tornado in MIAMI, OHIO
From 24-MAY-17 21:03:00 to 24-MAY-17 21:10:00 (EST-5)
Location: CASSTOWN
Tornado F-scale: EF1
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Based on video evidence and radar imagery, the tornado is believed to have touched down in a field north of the intersection of Polecat Road and Troy Urbana Road. The tornado moved north to Deweese Road approximately one-half mile north of the intersection with East Rusk Road. Tree branches generally 4 inches in diameter or smaller were broken immediately west of Deweese Road at the start of the tornado track. More significant damage occurred less than one-tenth of a mile north where several maple trees up to 18 inches in diameter were snapped. This is where the tornado was believed to be at peak intensity with winds estimated near 90 mph. There was also a large barn immediately east that was moved several inches off its foundation. This movement was likely caused by winds approaching 90 mph while flowing into the circulation. The tornado then started to weaken as it moved north-
northwest near Deweese Road to a point approximately two-tenths of a mile southwest of the intersection with East Peterson Road. Tree damage was generally less significant in this area with estimated wind speeds of 60-75 mph. The tornado appears to have lifted at this point, and no further damage was observed farther northwest. Damage along this path was oriented in convergent and semi-circular patterns consistent with the presence of a tornado.

Flash Flood in BUTLER, OHIO
From 24-MAY-17 16:45:00 to 24-MAY-17 17:45:00 (EST-5)
Location: SYMMES CORNER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flowing water was reported over a portion of Cincinnati Brookville Road near Shandon.

Tornado in FAYETTE, OHIO
From 24-MAY-17 19:27:00 to 24-MAY-17 19:30:00 (EST-5)
Location: LUTTRELL
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Based on radar data, video evidence and eyewitness reports, the tornado appeared to first touch down about 3 miles west-southwest of Octa in extreme western Fayette County. The tornado then crossed into eastern Greene County, about 3 miles south of Rosemoor, appearing to make occasional contact with the ground, before dissipating about 3 miles southeast of Jamestown at 1936EST.
As the tornado moved through primarily empty farm fields, there was little in the way of damage found. Therefore, maximum winds were estimated to be 50 mph, equivalent to a weak EF0 tornado and the maximum width was estimated to be 25 yards.

Tornado in CLARK, OHIO
From 24-MAY-17 20:16:00 to 24-MAY-17 20:20:00 (EST-5)
Location: PARK LAYNE
Tornado F-scale: EF1
Property damage: 250.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado first touched down on the southwest side of Park Layne and then moved to the northwest for 0.4 miles before exiting Clark County about 1.2 miles west-southwest of Park Layne.  The tornado continued in Miami County for another 4.1 miles, before dissipating at 2032EST. While in Clark County, the tornado caused damage to some commercial buildings and trees on the western side of Park Layne. Damage here was consistent with maximum winds of 100 mph (EF1). The maximum width in Clark county was 300 yards. This tornado was rated an EF1 in both Clark and Miami Counties.

Tornado in MIAMI, OHIO
From 24-MAY-17 20:20:00 to 24-MAY-17 20:32:00 (EST-5)
Location: BRANDT
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado first touched down on the western side of Park Layne in Clark County at 2016EST and entered Miami County at 2020EST, about 1.7 miles east-southeast of Brandt. The tornado continued in Miami County for another 4.1 miles before dissipating along State Route 571, west of State Route 201.
While in Miami County, tree and minor roof damage occurred along Bellefontaine Road, Palmer Road, and State Route 201, with maximum wind speed estimates of 95 mph in this area, or EF1.  The tornado track appeared to end just northwest of the State Route 571 intersection with State Route 201, where a barn sustained damage caused by estimated wind speeds of around 80 mph. The maximum width in Miami County was 300 yards. This tornado was rated an EF1 in both Miami and Clark Counties.

Tornado in GREENE, OHIO
From 24-MAY-17 19:30:00 to 24-MAY-17 19:36:00 (EST-5)
Location: BOWERSVILLE
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Based on radar data, video evidence and eyewitness reports, the tornado appeared to first touch down about 3 miles west-southwest of Octa in extreme western Fayette County at 1927EST. The tornado then crossed into eastern Greene County at 1930EST, about 3 miles south of Rosemoor, appearing to make occasional contact with the ground, before dissipating about 3 miles southeast of Jamestown.
As the tornado moved through primarily empty farm fields, there was little in the way of damage found. Therefore, maximum winds were estimated to be 50 mph, equivalent to a weak EF0 tornado and the maximum width was estimated to be 25 yards.

Tornado in GREENE, OHIO
From 24-MAY-17 19:26:00 to 24-MAY-17 19:34:00 (EST-5)
Location: XENIA GREENE CO ARPT
Tornado F-scale: EF0
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

The tornado first touched down along Colorado Drive where a small ornamental tree was uprooted. Additional small limb damage also occurred in this area. The tornado traveled north, where public video was provided of a small tornado crossing U.S. Route 35, just north of the Greene County Airport. The video showed the tornado lifting upward shortly after crossing north of Route 35, but damage had been reported at the intersection of Trebein and Dayton-Xenia Roads. Slightly farther north, some power line damage occurred in the 900 block of Trebein Road.