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Wilmington, Ohio

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May 21, 2010 -- Tornadoes and Flash Flooding


An area of upper level low pressure moved across the Great Lakes, with a trough extending into the Ohio Valley. The airmass had become unstable, and shear in the low levels of the atmosphere became favorable for the formation of tornadoes. In addition, thunderstorms tended to rebuild over the same areas, and rainfall was very heavy. This led to flash flooding across the region as well.

Brown/Highland County Tornado:

Location: near Mount Orab, Ohio
Time: 644 PM EDT, May 21, 2010
EF Rating: EF1
Maximum Winds: 100 MPH
Path Width: 50 yards
Path Length: 3 miles
The National Weather Service in Wilmington OH has confirmed a tornado near Mount Orab in Brown and Highland Counties of Ohio, on May 21, 2010. The tornado touched down in the vicinity of Highway 32 and Klein Road in Brown County, and crossed into Highland County before lifting near Highway 321 southeast of Buford. The worst damage occurred to a residence on Sicily Road in Highland County, which was rated EF1 damage (estimated wind speeds of 100 mph) due to a section of roofing removed from parts of the home, the front porch supports lifted and removed, numerous uprooted trees, and a 2x4 driven into decking material. Several other barns and outbuildings were destroyed or heavily damaged along the path. Witness accounts indicate there may have been two tornadoes on the ground at the same time, though damage assessment could not confirm this.
Original Tornado Warning Text
TCVG 0.1 Z/SRM
6:47 PM May 21 2010


Adams County Tornado:

Location: near Bentonville, Ohio
Time: 844 PM EDT, May 21, 2010
EF Rating: EF1
Maximum Winds: 110 MPH
Path Width: 75 yards
Path Length: 2.6 miles
The National Weather Service in Wilmington OH has confirmed a tornado near Bentonville in Adams County of Ohio, on May 21, 2010. Information from residents along Old Dutch Road revealed a fairly continuous tornado track of 2.6 miles in Adams County. The tornado initially touched down approximately 844 PM just north and east of the intersection of Old Dutch Road and Gray Road (Township Highway 185). The tornado moved north along Old Dutch Road, heavily damaging several well constructed barns and outbuildings. Mature, healthy trees were snapped at the trunk along this path. The tornado crossed Stanfield Road (Township Highway 326) and apparently crossed Old Dutch Road near its intersection with Clayton Pike (County Road 3). Along this stretch, the tornado caused significant tree damage, minor damage to homes, and the significant damage to numerous barns and outbuildings mentioned above. More trees were toppled as the tornado crossed Clayton Pike again, west of Old Dutch Road. At this point it appears the tornado began to intermittently lift, with the next reportable damage on neighboring Suck Run Road. Damage here was limited to windows being blown out of a home, and significant tree damage strewn about the property in various orientations. This is corroborated by several reports of a tornado touchdown in this area, and a strong radar signature of circulation. The damage to barns and trees is consistent with the upper limits of EF1 wind speeds (about 110 MPH).
Original Tornado Warning Text
KILN 0.5 Z/SRM
8:48 PM May 21 2010
TCVG 0.1 Z/SRM
8:55 PM May 21 2010




Heavy Rainfall and Flash Flooding:

Selected Rain Gauge Reports:

3.40" -- West Union OH (COOP)
2.37" -- Kings Mills OH (COOP)
2.12" -- 3 SW Maysville KY (KY Meso)
1.85" -- 11.6 ESE Cincinnati OH (CoCoRaHS)
1.79" -- 1.2 SW Goshen OH (CoCoRaHS)
1.78" -- 5.4 SSW Wilmington OH (CoCoRaHS)
1.70" -- 2.9 SE West Chester OH (CoCoRaHS)
1.56" -- 1.4 SE Sharonville OH (CoCoRaHS)
1.54" -- Cheviot OH (COOP)
1.26" -- 1.7 WSW Centerville OH (CoCoRaHS)
1.23" -- 6.1 W Port William OH (CoCoRaHS)
1.20" -- 1.4 SW Xenia OH (CoCoRaHS)
1.08" -- 1.5 S Oxford OH (CoCoRaHS)
1.06" -- 6.8 SSE Maysville KY (CoCoRaHS)
1.01" -- Waverly OH (COOP)
0.86" -- 3.7 S Chillicothe OH (CoCoRaHS)


KILN
Storm Total
Precipitation


Storm Reports:

NOTE: Marker locations are approximate and are not accurate to street level
LOCAL STORM REPORTS:
Tornado Hail Thunderstorm Wind Gust Thunderstorm Wind Damage
Flood Flash Flood Non-Thunderstorm Wind Gust Non-Thunderstorm Wind Damage
Other Report  

REPORTS WITH PHOTOS:
Tornado Hail Thunderstorm Wind Gust Thunderstorm Wind Damage
Flood Flash Flood Non-Thunderstorm Wind Gust Non-Thunderstorm Wind Damage
Other Report  

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National Weather Service
Wilmington Ohio Weather Forecast Office
1901 South State Route 134
Wilmington, OH 45177
Tel: (937) 383-0031
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Page last modified: May 24, 2010.
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