Tornadoes & Flash Flooding - May 21, 2010

May 21, 2010
Tornadoes & 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.

Tornado in Brown/Highland Counties

Tornado in Adams County

Rainfall

Snow/Sleet Ice
Rain
Home +Switch Basemap Esri, HERE, Garmin, FAO, USGS, EPA, NPS \| Zoom to + –	FLASH FLOOD WEST UNION, OH 05/22/10 0100 AM FLASH FLOOD RARDEN, OH 05/21/10 1113 PM FLASH FLOOD WEST UNION, OH 05/21/10 1105 PM FLASH FLOOD WEST UNION, OH 05/21/10 1059 PM FLASH FLOOD 3 NE WEST UNION, OH 05/21/10 1059 PM FLASH FLOOD 1 W WEST UNION, OH 05/21/10 1059 PM HAIL (E1.00 INCH) 4 N BLUE CREEK, OH 05/21/10 1010 PM HAIL (E1.00 INCH) 7 E WEST UNION, OH 05/21/10 0957 PM FLASH FLOOD 5 S WASHINGTON COURT HOUS, OH 05/21/10 0950 PM FLASH FLOOD HILLSBORO, OH 05/21/10 0945 PM TSTM WND DMG WEST UNION, OH 05/21/10 0940 PM FLASH FLOOD HILLSBORO, OH 05/21/10 0850 PM TORNADO 4 NW MANCHESTER, OH 05/21/10 0844 PM FLASH FLOOD 5 SSW LEBANON, OH 05/21/10 0730 PM FLASH FLOOD LEBANON, OH 05/21/10 0700 PM HAIL (E0.75 INCH) MILFORD, OH 05/21/10 0656 PM TORNADO 1 NE MOUNT ORAB, OH 05/21/10 0644 PM FLASH FLOOD 2 E LEBANON, OH 05/21/10 0622 PM TSTM WND DMG 3 ESE LEBANON, OH 05/21/10 0610 PM TSTM WND DMG MAINEVILLE, OH 05/21/10 0604 PM TSTM WND DMG RYLAND HEIGHTS, KY 05/21/10 0510 PM HAIL (E0.75 INCH) 5 SSW INDEPENDENCE, KY 05/21/10 0455 PM HAIL (E1.00 INCH) 2 NE WALTON, KY 05/21/10 0453 PM HAIL (E0.75 INCH) WALTON, KY 05/21/10 0450 PM
NOTE: Marker locations are approximate and are not accurate to street level.