An unusually strong wind field was in place ahead of a well defined cold front. This supported very high effective bulk shear values along with very high levels of helicity. All of this supported cells that quickly formed into a textbook line echo wave pattern (LEWP) which quickly moved across the area. There were a handful of spin ups within the LEWP that developed very deep mesocyclones with persistent wind threats.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 21-SEP-18 16:40:00 to 21-SEP-18 16:40:00 (EST-5)
Location: FORESTVILLE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported down.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 21-SEP-18 16:50:00 to 21-SEP-18 16:50:00 (EST-5)
Location: BELLEVIEW
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were reported down.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 21-SEP-18 16:50:00 to 21-SEP-18 16:50:00 (EST-5)
Location: HAMLET
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were reported down.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 21-SEP-18 16:54:00 to 21-SEP-18 16:54:00 (EST-5)
Location: GERRY
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported down.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 21-SEP-18 16:28:00 to 21-SEP-18 16:28:00 (EST-5)
Location: DUNKIRK
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: C-MAN Station

Thunderstorm Wind in ERIE, NEW YORK
From 21-SEP-18 16:34:00 to 21-SEP-18 16:34:00 (EST-5)
Location: GETZVILLE
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Broadcast Media

A tree was reported down blocking Tonawanda Creek by the media.

Thunderstorm Wind in ERIE, NEW YORK
From 21-SEP-18 16:40:00 to 21-SEP-18 16:40:00 (EST-5)
Location: EBENEZER
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported down.

Thunderstorm Wind in ERIE, NEW YORK
From 21-SEP-18 16:56:00 to 21-SEP-18 16:56:00 (EST-5)
Location: EAST AURORA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree fell on a house on Girard Avenue.

Thunderstorm Wind in CHAUTAUQUA, NEW YORK
From 21-SEP-18 17:02:00 to 21-SEP-18 17:02:00 (EST-5)
Location: ELLINGTON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 21-SEP-18 17:16:00 to 21-SEP-18 17:16:00 (EST-5)
Location: LITTLE VLY
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were reported down.

Thunderstorm Wind in WYOMING, NEW YORK
From 21-SEP-18 17:20:00 to 21-SEP-18 17:20:00 (EST-5)
Location: JAVA CENTER
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 21-SEP-18 17:22:00 to 21-SEP-18 17:22:00 (EST-5)
Location: ELLICOTTVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees were reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 21-SEP-18 17:26:00 to 21-SEP-18 17:26:00 (EST-5)
Location: SALAMANCA
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Trees and wires were reported down on Jefferson Street, Clinton Street, and Front Avenue.

Thunderstorm Wind in WYOMING, NEW YORK
From 21-SEP-18 17:29:00 to 21-SEP-18 17:29:00 (EST-5)
Location: WARSAW
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were reported down.

Thunderstorm Wind in CATTARAUGUS, NEW YORK
From 21-SEP-18 17:30:00 to 21-SEP-18 17:30:00 (EST-5)
Location: GREAT VLY
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires reported down.

Thunderstorm Wind in WYOMING, NEW YORK
From 21-SEP-18 17:40:00 to 21-SEP-18 17:40:00 (EST-5)
Location: CASTILE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires reported down.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 21-SEP-18 17:39:00 to 21-SEP-18 17:39:00 (EST-5)
Location: CALEDONIA
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and wires were reported down.

Thunderstorm Wind in WYOMING, NEW YORK
From 21-SEP-18 17:46:00 to 21-SEP-18 17:46:00 (EST-5)
Location: PORTAGE
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: COOP Observer

A gazebo was damaged by a thunderstorm wind gust.

Thunderstorm Wind in ONTARIO, NEW YORK
From 21-SEP-18 18:07:00 to 21-SEP-18 18:07:00 (EST-5)
Location: EAST BLOOMFIELD
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Tree and wires were reported down on West Main Street.

Thunderstorm Wind in ONTARIO, NEW YORK
From 21-SEP-18 18:09:00 to 21-SEP-18 18:09:00 (EST-5)
Location: EAST BLOOMFIELD
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A large tree was reported down.

Thunderstorm Wind in LIVINGSTON, NEW YORK
From 21-SEP-18 18:13:00 to 21-SEP-18 18:13:00 (EST-5)
Location: DANSVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Multiple trees and wires were reported down.

Thunderstorm Wind in ONTARIO, NEW YORK
From 21-SEP-18 18:05:00 to 21-SEP-18 18:12:00 (EST-5)
Location: EAST BLOOMFIELD
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Multiple hardwood trees were reported down at Flatiron Road and U.S. Highway 20. Limbs were also down nearby with shingles blown off the roof of an antique shop. Damage consistent with a microburst continued east-northeast into Canandaigua that included the overturning of a mobile sign and recreational vehicle as well as trees and limbs down along North Pearl Stree and Buffalo Street Extension.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 21-SEP-18 18:12:00 to 21-SEP-18 18:12:00 (EST-5)
Location: BOLIVAR
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported down.

Thunderstorm Wind in ALLEGANY, NEW YORK
From 21-SEP-18 18:14:00 to 21-SEP-18 18:14:00 (EST-5)
Location: BELMONT
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: 911 Call Center

A tree was reported down.