A warm front pressed north across the forecast area during the morning and midday hours. In its wake, dewpoints jumped into the mid 60s while increasing amounts of sun allowed for a rapid increase in instability over the Southern Tier and Finger Lakes region. While the airmass destabilized, a low-level jet made its way across western New York. This supported ample deep layer shear. Initially, cells over the Southern Tier had trouble building due to the presence of a weak cap. Scattered storms over Allegany County finally broke that cap. Meanwhile, a strong lake breeze shielded the Niagara Frontier. A solid line of strong convection over southern Ontario approached the western edge of the lake breeze late in the afternoon. It was initially believed that the line would weaken as it tried to cross into the marine stabilized air. While the convection itself did weaken, a strong outflow pushed southeast across Niagara county. A warning was in place for the strong winds, and strong gusts did materialize in Niagara Falls. Additional cells formed in the still very unstable air mass over the Southern Tier while the southern Ontario convection broke down. As the evening wore on, the outflow from the southern Ontario convection merged with the eastern edge of the old lake breeze boundary, and a new line blew up east of Batavia and Warsaw. This line eventually supported warnings for the remainder of the area.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 25-MAY-19 18:32:00 to 25-MAY-19 18:32:00 (EST-5)
Location: NORTH CUBA
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A large tree was reported down in New Hudson.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 25-MAY-19 18:53:00 to 25-MAY-19 18:53:00 (EST-5)
Location: HUME
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down in the Town of Hume.

Thunderstorm Wind in ERIE, NEW YORK
From 25-MAY-19 18:00:00 to 25-MAY-19 18:00:00 (EST-5)
Location: HUNTS CORNERS
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires reported down in Newstead.

Thunderstorm Wind in GENESEE, NEW YORK
From 25-MAY-19 18:03:00 to 25-MAY-19 18:03:00 (EST-5)
Location: BASOM
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 25-MAY-19 18:12:00 to 25-MAY-19 18:12:00 (EST-5)
Location: CATTARAUGUS
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tree reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 25-MAY-19 18:18:00 to 25-MAY-19 18:18:00 (EST-5)
Location: EDDYVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 25-MAY-19 18:24:00 to 25-MAY-19 18:24:00 (EST-5)
Location: ELLICOTTVILLE
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Route 242 was closed due to downed powerlines.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 25-MAY-19 18:24:00 to 25-MAY-19 18:24:00 (EST-5)
Location: ASHFORD
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 25-MAY-19 18:55:00 to 25-MAY-19 18:55:00 (EST-5)
Location: HEMLOCK
Magnitude: 50.00 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 25-MAY-19 18:45:00 to 25-MAY-19 18:45:00 (EST-5)
Location: GENESEO
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in MONROE, NEW YORK
From 25-MAY-19 18:42:00 to 25-MAY-19 18:42:00 (EST-5)
Location: SCOTTSVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and wires were reported down.

Thunderstorm Wind in ONTARIO, NEW YORK
From 25-MAY-19 19:30:00 to 25-MAY-19 19:30:00 (EST-5)
Location: GENEVA
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down.

Thunderstorm Wind in CAYUGA, NEW YORK
From 25-MAY-19 19:30:00 to 25-MAY-19 19:30:00 (EST-5)
Location: CATO
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down.

Thunderstorm Wind in ONTARIO, NEW YORK
From 25-MAY-19 19:00:00 to 25-MAY-19 19:00:00 (EST-5)
Location: HONEOYE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 25-MAY-19 19:03:00 to 25-MAY-19 19:03:00 (EST-5)
Location: ANDOVER
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple trees were reported down in the Town of Andover.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 25-MAY-19 18:55:00 to 25-MAY-19 18:55:00 (EST-5)
Location: LIVONIA
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in NIAGARA, NEW YORK
From 25-MAY-19 17:34:00 to 25-MAY-19 17:34:00 (EST-5)
Location: WALLMORE
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Flood in ALLEGANY, NEW YORK
From 25-MAY-19 19:06:00 to 25-MAY-19 19:50:00 (EST-5)
Location: FRIENDSHIP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

I-86 in Friendship was closed for 49 minutes due to water on the road.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 25-MAY-19 15:14:00 to 25-MAY-19 15:14:00 (EST-5)
Location: OTTO
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Six trees were reported down with damage to a chicken coop. All animals, including nine horses and two donkeys were safe.

Thunderstorm Wind in NIAGARA, NEW YORK
From 25-MAY-19 17:34:00 to 25-MAY-19 17:34:00 (EST-5)
Location: NIAGARA FLLS INTL AR
Magnitude: 61.00 MG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: ASOS

Damage was reported to aircraft at the Air National Guard Base at the Niagara Falls International Airport.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 25-MAY-19 17:42:00 to 25-MAY-19 17:42:00 (EST-5)
Location: FREWSBURG
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and wires were reported down in Frewsburg.

Thunderstorm Wind in JEFFERSON, NEW YORK
From 25-MAY-19 16:42:00 to 25-MAY-19 16:42:00 (EST-5)
Location: LA FARGEVILLE
Magnitude: 50.00 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 25-MAY-19 17:48:00 to 25-MAY-19 17:48:00 (EST-5)
Location: GREAT VLY
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed onto route 4.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 25-MAY-19 18:10:00 to 25-MAY-19 18:10:00 (EST-5)
Location: NEW ALBION
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was reported down.

Thunderstorm Wind in NIAGARA, NEW YORK
From 25-MAY-19 17:52:00 to 25-MAY-19 17:52:00 (EST-5)
Location: NORTH TONAWANDA
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires reported down.

Thunderstorm Wind in ERIE, NEW YORK
From 25-MAY-19 18:00:00 to 25-MAY-19 18:00:00 (EST-5)
Location: CLARENCE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees reported down.

Thunderstorm Wind in NIAGARA, NEW YORK
From 25-MAY-19 17:37:00 to 25-MAY-19 17:37:00 (EST-5)
Location: LEWISTON HGTS
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported down.

Thunderstorm Wind in NIAGARA, NEW YORK
From 25-MAY-19 17:40:00 to 25-MAY-19 17:40:00 (EST-5)
Location: ST JOHNSBURG
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and wires were reported downed.