A weakening surface low tracked northeast across Lake Huron during the afternoon hours with its corresponding warm front extending to the east across Lake Ontario then snaking south ahead of the higher terrain east of Syracuse. This placed all of western New York within the warm sector of the aforementioned storm system. Within this environment, a weak 30 kt low level jet was moving through the region. This helped to produce ample shear while instability increased in the warm sector of the system. A line of convection crossed Chautauqua and western Cattaraugus county, gradually increasing in intensity with time as it crossed the Southern Tier.  There were several reports of flooding issues with the thunderstorms, even though they were moving eastward fairly quickly. A second line of training thunderstorms developed again in evening and trained over the Southern Tier, resulting in additional flooding.

Hail in ALLEGANY, NEW YORK
From 06-OCT-18 15:40:00 to 06-OCT-18 15:40:00 (EST-5)
Location: FRIENDSHIP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Flash Flood in CHAUTAUQUA, NEW YORK
From 06-OCT-18 22:15:00 to 07-OCT-18 00:15:00 (EST-5)
Location: SILVER CREEK
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Route 20 near Silver Creek was reported to be flooded.

Flash Flood in CHAUTAUQUA, NEW YORK
From 06-OCT-18 22:20:00 to 07-OCT-18 00:20:00 (EST-5)
Location: FREDONIA
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Route 20 near Fredonia was reported to be flooded.

Flash Flood in CHAUTAUQUA, NEW YORK
From 06-OCT-18 22:30:00 to 07-OCT-18 00:30:00 (EST-5)
Location: FORESTVILLE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Widespread street flooding was reported in Forestville.

Flash Flood in ERIE, NEW YORK
From 06-OCT-18 22:30:00 to 07-OCT-18 00:30:00 (EST-5)
Location: LAWTONS
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Flooding and debris was reported on Gowanda Road near Marshfield Road. Multiple other road closures were reported in the area of Collins. A creek was also reported out of its banks and flooding the nearby area.

Flash Flood in ERIE, NEW YORK
From 06-OCT-18 22:30:00 to 07-OCT-18 00:30:00 (EST-5)
Location: NEW OREGON
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flooding was reported to close a portion of Genesee Road. Additional flooding closed a portion of Sharp Road with over three feet of water and debris.

Flash Flood in CHAUTAUQUA, NEW YORK
From 06-OCT-18 22:50:00 to 07-OCT-18 00:50:00 (EST-5)
Location: LAONA
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

Flooding was reported on Route 60 between Bard Road and Porter Road.

Lightning in ERIE, NEW YORK
From 06-OCT-18 13:17:00 to 06-OCT-18 13:17:00 (EST-5)
Location: DUELLS CORNER
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Newspaper

A lightning strike caused a fire that resulted in approximately $200,000 in damage to a home at 35 Lakeridge Drive in Orchard Park.

Hail in ALLEGANY, NEW YORK
From 06-OCT-18 15:39:00 to 06-OCT-18 15:39:00 (EST-5)
Location: FRIENDSHIP
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public