A warm front pushed a very hot air mass into western New York. Temperatures soared to as high as 92 degrees at Dansville. Combined with dewpoints in the low to mid 70s, a very highly unstable environment developed with northwest flow aloft. Surface low pressure tracked southeast across the eastern Lake Ontario region, dragging a trailing cold front southward across areas south of Lake Ontario during the afternoon into the early evening. A line of cumulus clouds over Lake Ontario during the morning hours drifted southward in the mean flow, and with peak daytime heating, blossomed into a cluster of thunderstorms. Abundant instability produced several nice core structures with hail reported to be a large as 2 inches even with a freezing level of over 14,000 feet.

Thunderstorm Wind in GENESEE, NEW YORK
From 27-AUG-20 15:08:00 to 27-AUG-20 15:08:00 (EST-5)
Location: EAST ALEXANDER
Magnitude: 51.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported down with damage to the roof of a barn on Creek Road.

Thunderstorm Wind in GENESEE, NEW YORK
From 27-AUG-20 15:08:00 to 27-AUG-20 15:08:00 (EST-5)
Location: BATAVIA
Magnitude: 51.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported down with roof damage to another barn.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 27-AUG-20 15:13:00 to 27-AUG-20 15:13:00 (EST-5)
Location: PORTLAND
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 27-AUG-20 15:13:00 to 27-AUG-20 15:13:00 (EST-5)
Location: FREDONIA
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 27-AUG-20 15:19:00 to 27-AUG-20 15:19:00 (EST-5)
Location: STOCKTON
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in GENESEE, NEW YORK
From 27-AUG-20 15:25:00 to 27-AUG-20 15:25:00 (EST-5)
Location: BETHANY CENTER
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down onto Ellicott Street and Putnam Road.

Thunderstorm Wind in GENESEE, NEW YORK
From 27-AUG-20 15:25:00 to 27-AUG-20 15:25:00 (EST-5)
Location: STAFFORD STATION
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree and wires were reported down onto Main Road.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 27-AUG-20 15:28:00 to 27-AUG-20 15:28:00 (EST-5)
Location: YORK
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in ERIE, NEW YORK
From 27-AUG-20 15:31:00 to 27-AUG-20 15:31:00 (EST-5)
Location: ELMA
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in ERIE, NEW YORK
From 27-AUG-20 15:34:00 to 27-AUG-20 15:34:00 (EST-5)
Location: MARILLA
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 27-AUG-20 15:34:00 to 27-AUG-20 15:34:00 (EST-5)
Location: GENESEO
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were reported down throughout town.

Thunderstorm Wind in ERIE, NEW YORK
From 27-AUG-20 15:35:00 to 27-AUG-20 15:35:00 (EST-5)
Location: MARILLA
Magnitude: 51.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed onto a car, trapping people inside on Two Rod Road. There were no injuries reported.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 27-AUG-20 15:37:00 to 27-AUG-20 15:37:00 (EST-5)
Location: SINCLAIRVILLE
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in ERIE, NEW YORK
From 27-AUG-20 15:37:00 to 27-AUG-20 15:37:00 (EST-5)
Location: EAST AURORA
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in ERIE, NEW YORK
From 27-AUG-20 15:20:00 to 27-AUG-20 15:20:00 (EST-5)
Location: LACKAWANNA
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Wind gust was measured on the Buffalo Skyway.

Thunderstorm Wind in WYOMING, NEW YORK
From 27-AUG-20 15:40:00 to 27-AUG-20 15:40:00 (EST-5)
Location: COVINGTON
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was down blocking Route 19.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 27-AUG-20 15:46:00 to 27-AUG-20 15:46:00 (EST-5)
Location: LAKEWOOD
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 27-AUG-20 15:46:00 to 27-AUG-20 15:46:00 (EST-5)
Location: GERRY
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in GENESEE, NEW YORK
From 27-AUG-20 15:46:00 to 27-AUG-20 15:46:00 (EST-5)
Location: PAVILION
Magnitude: 51.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

A tree was down onto a house on Route 63.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 27-AUG-20 15:49:00 to 27-AUG-20 15:49:00 (EST-5)
Location: CLYMER
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 27-AUG-20 15:53:00 to 27-AUG-20 15:53:00 (EST-5)
Location: RANDOLPH
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in WYOMING, NEW YORK
From 27-AUG-20 15:53:00 to 27-AUG-20 15:53:00 (EST-5)
Location: ARCADE
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two trees were reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 27-AUG-20 16:15:00 to 27-AUG-20 16:15:00 (EST-5)
Location: OLEAN
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees and wires were down around Olean.

Heavy Rain in GENESEE, NEW YORK
From 27-AUG-20 15:28:00 to 27-AUG-20 15:28:00 (EST-5)
Location: LE ROY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 2.06 inches of rainfall.

Heavy Rain in LIVINGSTON, NEW YORK
From 27-AUG-20 14:00:00 to 27-AUG-20 16:00:00 (EST-5)
Location: LIMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 2.25 inches of rainfall in two hours.

Heavy Rain in LIVINGSTON, NEW YORK
From 27-AUG-20 16:49:00 to 27-AUG-20 16:49:00 (EST-5)
Location: LIMA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported 2.47 inches of rainfall.

Hail in LIVINGSTON, NEW YORK
From 27-AUG-20 14:25:00 to 27-AUG-20 14:25:00 (EST-5)
Location: LIVONIA
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GENESEE, NEW YORK
From 27-AUG-20 13:48:00 to 27-AUG-20 13:48:00 (EST-5)
Location: MORGANVILLE
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and powerlines were down onto Warner Road.

Thunderstorm Wind in MONROE, NEW YORK
From 27-AUG-20 13:57:00 to 27-AUG-20 13:57:00 (EST-5)
Location: MENDON CENTER
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees down onto Mendon Center Road and Canfield Road.

Thunderstorm Wind in MONROE, NEW YORK
From 27-AUG-20 14:04:00 to 27-AUG-20 14:04:00 (EST-5)
Location: SCOTTSVILLE
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were down onto Route 251.

Thunderstorm Wind in GENESEE, NEW YORK
From 27-AUG-20 14:16:00 to 27-AUG-20 14:16:00 (EST-5)
Location: LE ROY
Magnitude: 51.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and poles were reported down.

Thunderstorm Wind in ONTARIO, NEW YORK
From 27-AUG-20 14:25:00 to 27-AUG-20 14:25:00 (EST-5)
Location: CANANDAIGUA
Magnitude: 51.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Two trees were reported down in Canandaigua.

Thunderstorm Wind in ONTARIO, NEW YORK
From 27-AUG-20 14:37:00 to 27-AUG-20 14:37:00 (EST-5)
Location: HONEOYE
Magnitude: 51.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Trained Spotter

A tree was reported down onto Route 20A in front of town hall.