While a slow moving cold front eased south across southern Ontario, a 30-mile wide band of showers and thunderstorms developed over Western New York. Initially the thunderstorms produced heavy rains. Over parts of Genesee county, two to three inches of rain fell in less than two hours. Roads were reported flooded and closed in Batavia, LeRoy and Stafford. In Batavia, about three dozen basements flooded, however none of the flood waters reached the first floor. In one home a twenty-foot section of the foundation collapsed. The thunderstorms continued to strengthen as they moved into the southern tier and eastern Lake Ontario Region. Reports of downed trees and wires were scattered throughout the region. Falling trees damaged homes in Savannah and Fairport. Hail, up to three-quarter inch in diameter, was reported with the storms.

Thunderstorm Wind in WAYNE, NEW YORK
From 31-JUL-12 16:00:00 to 31-JUL-12 16:00:00 (EST-5)
Location: WALWORTH
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported numerous trees and wires down.

Thunderstorm Wind in WAYNE, NEW YORK
From 31-JUL-12 16:15:00 to 31-JUL-12 16:15:00 (EST-5)
Location: EAST WILLIAMSON
Magnitude: 50.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a tree fell on a house.

Thunderstorm Wind in WAYNE, NEW YORK
From 31-JUL-12 16:35:00 to 31-JUL-12 16:35:00 (EST-5)
Location: CLYDE AERO PARK ARPT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.

Thunderstorm Wind in MONROE, NEW YORK
From 31-JUL-12 16:50:00 to 31-JUL-12 16:50:00 (EST-5)
Location: BLACKWATCH HILLS
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a tree down on a house.

Thunderstorm Wind in WAYNE, NEW YORK
From 31-JUL-12 16:38:00 to 31-JUL-12 16:38:00 (EST-5)
Location: SAVANNAH
Magnitude: 55.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down. Power poles were snapped.

Hail in ALLEGANY, NEW YORK
From 31-JUL-12 17:02:00 to 31-JUL-12 17:02:00 (EST-5)
Location: WELLSVILLE
Magnitude: 0.75 
Reported by: Law Enforcement

Flash Flood in GENESEE, NEW YORK
From 31-JUL-12 17:05:00 to 31-JUL-12 17:05:00 (EST-5)
Location: LE ROY
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in OSWEGO, NEW YORK
From 31-JUL-12 17:15:00 to 31-JUL-12 17:15:00 (EST-5)
Location: FULTON
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.

Flash Flood in GENESEE, NEW YORK
From 31-JUL-12 17:15:00 to 31-JUL-12 17:15:00 (EST-5)
Location: BATAVIA
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in OSWEGO, NEW YORK
From 31-JUL-12 17:15:00 to 31-JUL-12 17:15:00 (EST-5)
Location: OSWEGO
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 31-JUL-12 17:16:00 to 31-JUL-12 17:16:00 (EST-5)
Location: DEXTER
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.

Flash Flood in GENESEE, NEW YORK
From 31-JUL-12 17:20:00 to 31-JUL-12 17:20:00 (EST-5)
Location: STAFFORD
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in OSWEGO, NEW YORK
From 31-JUL-12 17:25:00 to 31-JUL-12 17:25:00 (EST-5)
Location: VOLNEY
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 31-JUL-12 17:28:00 to 31-JUL-12 17:28:00 (EST-5)
Location: WHITESVILLE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.

Thunderstorm Wind in OSWEGO, NEW YORK
From 31-JUL-12 17:42:00 to 31-JUL-12 17:42:00 (EST-5)
Location: SANDY CREEK
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 31-JUL-12 17:45:00 to 31-JUL-12 17:45:00 (EST-5)
Location: ELLISBURG
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and wires down.