A stationary front, coupled with an approaching upper level trough caused severe thunderstorms across the Lower Hudson Valley and Long Island.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 21-JUL-10 17:05:00 to 21-JUL-10 17:05:00 (EST-5)
Location: MT SINAI
Magnitude: 52.00 EG
Reported by: NWS Employee

A wind gust of 60 mph was estimated at Cedar Beach.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 21-JUL-10 18:10:00 to 21-JUL-10 18:10:00 (EST-5)
Location: MECOX
Magnitude: 56.00 MG
Reported by: Mesonet

A wind gust of 56 knots was measured at the Mecox Bay mesonet location.

Thunderstorm Wind in ORANGE, NEW YORK
From 21-JUL-10 15:30:00 to 21-JUL-10 15:30:00 (EST-5)
Location: HIGHLAND FALLS
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Law Enforcement

Wires were reported down in the southbound lane of US Route 9W near Highland Falls.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 21-JUL-10 17:10:00 to 21-JUL-10 17:10:00 (EST-5)
Location: CROTON ON HUDSON
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Trained Spotter

A tree was reported down in Croton-On-Hudson.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 21-JUL-10 16:05:00 to 21-JUL-10 16:05:00 (EST-5)
Location: KATONAH
Magnitude: 61.00 EG
Property damage: 20.00K
Reported by: Newspaper

Numerous trees were reported down in Katonah, including two onto cars.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 21-JUL-10 16:10:00 to 21-JUL-10 16:10:00 (EST-5)
Location: BEDFORD
Magnitude: 61.00 EG
Property damage: 15.00K
Reported by: Newspaper

Multiple trees and power lines were reported down between Bedford and Pound Ridge, including bringing one large tree into a house on Eastwoods Road in Pound Ridge.

Hail in WESTCHESTER, NEW YORK
From 21-JUL-10 16:15:00 to 21-JUL-10 16:15:00 (EST-5)
Location: CROSS RIVER
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported in Cross River New York.

Hail in ORANGE, NEW YORK
From 21-JUL-10 16:37:00 to 21-JUL-10 16:37:00 (EST-5)
Location: MONROE
Magnitude: 0.88 
Reported by: Trained Spotter

Nickle size hail was reported in Monroe.

Hail in WESTCHESTER, NEW YORK
From 21-JUL-10 16:15:00 to 21-JUL-10 16:15:00 (EST-5)
Location: BEDFORD
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported in Bedford.

Thunderstorm Wind in ORANGE, NEW YORK
From 21-JUL-10 16:23:00 to 21-JUL-10 16:23:00 (EST-5)
Location: GOSHEN
Magnitude: 56.00 EG
Property damage: 3.00K
Reported by: Law Enforcement

Trees and wires were reported down throughout the town of Goshen.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 21-JUL-10 17:55:00 to 21-JUL-10 17:55:00 (EST-5)
Location: JAMESPORT
Magnitude: 61.00 EG
Property damage: 7.50K
Reported by: Fire Department/Rescue

Multiple trees were reported down in the town of Jamestown.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 21-JUL-10 17:30:00 to 21-JUL-10 17:30:00 (EST-5)
Location: SPRINGS
Magnitude: 70.00 EG
Property damage: 25.00K
Reported by: Law Enforcement

Dozens of trees, including several large ones, and wires were reported down in the Hamlets of Springs and Northwest Harbor in the town of East Hampton. The hardest hit areas were from Woodbine Drive to Glade Road in Springs and Lafarge's Landing in Northwest Harbor.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 21-JUL-10 18:46:00 to 21-JUL-10 18:46:00 (EST-5)
Location: YAPHANK
Magnitude: 61.00 EG
Property damage: 7.50K
Reported by: NWS Employee

Multiple trees were reported down along William Floyd Parkway, south of the entrance to Brookhaven National Lab, and north of the Long Island Expressway.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 21-JUL-10 19:19:00 to 21-JUL-10 19:19:00 (EST-5)
Location: WHITE PLAINS
Magnitude: 56.00 EG
Property damage: 10.00K
Reported by: Law Enforcement

Trees were reported down throughout the town of White Plains.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 21-JUL-10 16:15:00 to 21-JUL-10 16:15:00 (EST-5)
Location: CROSS RIVER
Magnitude: 61.00 EG
Property damage: 10.00K
Reported by: Public

Trees were reported snapped in half in the town of Cross River.

Hail in ROCKLAND, NEW YORK
From 21-JUL-10 16:50:00 to 21-JUL-10 16:50:00 (EST-5)
Location: TOMKINS COVE
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported in Tompkins Cove.

Hail in ROCKLAND, NEW YORK
From 21-JUL-10 16:59:00 to 21-JUL-10 16:59:00 (EST-5)
Location: TOMKINS COVE
Magnitude: 2.00 
Reported by: Trained Spotter

Hen egg size hail was reported in Tompkins Cove.

Lightning in ORANGE, NEW YORK
From 21-JUL-10 16:41:00 to 21-JUL-10 16:41:00 (EST-5)
Location: BLOOMING GROVE
Reported by: Amateur Radio

A 19 year old female was struck by lightning on Heard Road in Blooming Grove.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 21-JUL-10 13:02:00 to 21-JUL-10 13:02:00 (EST-5)
Location: JAMESPORT
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Law Enforcement

Wires were reported down on Manor Lane just west of Jamesport.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 21-JUL-10 18:30:00 to 21-JUL-10 18:30:00 (EST-5)
Location: MT SINAI
Magnitude: 52.00 EG
Reported by: Public

An estimated wind gust of 60 mph was reported at Cedar Beach.