Low pressure moved across the Great Lakes bringing moist, unstable air to the region. Showers and thunderstorms developed along lake breeze boundaries and persisted through the late afternoon and evening hours across the western southern tier and western Finger Lakes Region.  Localized rainfall amounts of up to three inches fell in just a few hours resulting in flash flooding. Numerous roads were closed and/or damaged by the flood waters. Basements were flooded. In some locations, for example Wellsville, States of Emergency were declared in response to the flooding. In Scio, one woman suffered minor injuries as a section of Iron Road gave way as she was driving on it. About a dozen homes were evacuated in Wellsville. Several golf courses sustained damage from the flood waters including Attica, Bethany Hills and Byrncliff. Specific roads closed included:  Gerry-Levant, Mee and Stone Roads in Falconer, County Road 48 in Belmont, Routes 9 and 31 in Scio, Chaddock Road in Attica, Perry Road in Sheldon, Route 15 in Geneseo, and Route 16 between Yorkshire and Delevan.  Several farms suffered crop damage as recently planted seed was washed away by the flood waters.

Flash Flood in CATTARAUGUS, NEW YORK
From 13-MAY-11 19:57:00 to 13-MAY-11 21:57:00 (EST-5)
Location: YORKSHIRE
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in CHAUTAUQUA, NEW YORK
From 13-MAY-11 15:42:00 to 13-MAY-11 18:00:00 (EST-5)
Location: FREWSBURG
Flood cause: Heavy Rain
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in CATTARAUGUS, NEW YORK
From 13-MAY-11 16:10:00 to 13-MAY-11 18:00:00 (EST-5)
Location: SALAMANCA
Flood cause: Heavy Rain
Property damage: 150.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in CHAUTAUQUA, NEW YORK
From 13-MAY-11 16:53:00 to 13-MAY-11 18:00:00 (EST-5)
Location: FREWSBURG
Flood cause: Heavy Rain
Property damage: 45.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flood in ALLEGANY, NEW YORK
From 13-MAY-11 19:15:00 to 13-MAY-11 22:30:00 (EST-5)
Location: BELMONT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding continued from afternoon and evening thunderstorms.

Flash Flood in ALLEGANY, NEW YORK
From 13-MAY-11 17:06:00 to 13-MAY-11 19:15:00 (EST-5)
Location: SCIO
Flood cause: Heavy Rain
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in ALLEGANY, NEW YORK
From 13-MAY-11 18:00:00 to 13-MAY-11 19:15:00 (EST-5)
Location: WELLSVILLE
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in WYOMING, NEW YORK
From 13-MAY-11 17:00:00 to 13-MAY-11 19:00:00 (EST-5)
Location: ATTICA
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in WYOMING, NEW YORK
From 13-MAY-11 18:15:00 to 13-MAY-11 19:30:00 (EST-5)
Location: NORTH JAVA
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in LIVINGSTON, NEW YORK
From 13-MAY-11 17:45:00 to 13-MAY-11 19:00:00 (EST-5)
Location: LAKEVILLE HANNAS ARP
Flood cause: Heavy Rain
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in ALLEGANY, NEW YORK
From 13-MAY-11 16:28:00 to 13-MAY-11 19:15:00 (EST-5)
Location: BELMONT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter