Showers and thunderstorms developed during the afternoon along a west-to-east oriented frontal boundary along the south shore of Lake Ontario. Instability generated CAPE values of around 1500 J/kg along and just south of the frontal boundary. Bulk shear was ample enough to support organized and even rotating updrafts. The instability was surprising considering that it was cloudy all day, but with the storms that developed, it was apparently present.
Thunderstorms developed first over the Niagara Peninsula, which then tracked into the Buffalo area. A narrow velocity couplet developed over Kenmore and Tonawanda, tracking east over Williamsville and then to Harris Hill. This feature went over the northside of the radar and made it difficult to see as it passed to our north. Another velocity signature in northeastern Erie county indicated possible rotation as well. The storms got weaker as they got into eastern Genesee County, however a ball of wind continued to track east with them.
Another line of storms formed from Oswego to Onondaga counties. This line of storms expanded in coverage and severity while a north-south line of storms approached from Lake Ontario. These two lines merged over northern Oswego and southwest Jefferson counties, as velocity values increased near Sackets Harbor, where several trees were reported down.

Flash Flood in MONROE, NEW YORK
From 08-JUL-21 16:22:00 to 08-JUL-21 17:52:00 (EST-5)
Location: PT PLEASANT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Flooding was reported on Route 104 and 590. Deep water was reported on Titus Ave and Ridge Drive. Several water rescues were performed.

Thunderstorm Wind in GENESEE, NEW YORK
From 08-JUL-21 15:36:00 to 08-JUL-21 15:36:00 (EST-5)
Location: ELBA
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: NWS Employee

A tree and wires were reported down on Lockport Road near Elba.

Thunderstorm Wind in ERIE, NEW YORK
From 08-JUL-21 14:44:00 to 08-JUL-21 14:44:00 (EST-5)
Location: TONAWANDA
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported down near Highland Avenue and Tussing Lane.

Thunderstorm Wind in ERIE, NEW YORK
From 08-JUL-21 14:46:00 to 08-JUL-21 14:46:00 (EST-5)
Location: KENMORE
Magnitude: 51.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

A large tree branch fell on and damaged a call on Treadwell Road.

Thunderstorm Wind in ERIE, NEW YORK
From 08-JUL-21 14:46:00 to 08-JUL-21 14:46:00 (EST-5)
Location: KENMORE
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was downed onto Westchester Boulevard.

Thunderstorm Wind in ERIE, NEW YORK
From 08-JUL-21 15:13:00 to 08-JUL-21 15:13:00 (EST-5)
Location: SWIFTS MILLS
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple trees were reported downed.

Thunderstorm Wind in ERIE, NEW YORK
From 08-JUL-21 15:13:00 to 08-JUL-21 15:13:00 (EST-5)
Location: AKRON
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Trees were reported down by local media.

Thunderstorm Wind in ERIE, NEW YORK
From 08-JUL-21 14:57:00 to 08-JUL-21 14:57:00 (EST-5)
Location: NORTH BAILEY
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Broadcast Media

A tree was reported down onto Sheridan Drive by the media.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 08-JUL-21 16:27:00 to 08-JUL-21 16:27:00 (EST-5)
Location: SACKETS HARBOR
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Several trees and wires were reported down.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 08-JUL-21 16:38:00 to 08-JUL-21 16:38:00 (EST-5)
Location: DEXTER
Magnitude: 51.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Several trees were down with damage to a camper and tents at Black River Bay Campground.