A passing pre-frontal trough and cold front, coupled with a mid level disturbance, produced severe thunderstorms across Southeast New York. The largest impact was across the Lower Hudson Valley, where there was at least one supercell, which produced a tornado in Orange County, and caused a microburst in Westchester County.

Hail in ORANGE, NEW YORK
From 29-JUL-11 16:20:00 to 29-JUL-11 16:20:00 (EST-5)
Location: BLOOMING GROVE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Half dollar size hail was reported in Blooming Grove.

Hail in ORANGE, NEW YORK
From 29-JUL-11 16:25:00 to 29-JUL-11 16:25:00 (EST-5)
Location: BLOOMING GROVE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported in Blooming Grove.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 29-JUL-11 17:29:00 to 29-JUL-11 17:29:00 (EST-5)
Location: HASTINGS ON HUDSON
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Law Enforcement

A tree was reported down on Ogden Avenue in White Plains.

Thunderstorm Wind in KINGS, NEW YORK
From 29-JUL-11 18:39:00 to 29-JUL-11 18:39:00 (EST-5)
Location: BROOKLYN
Magnitude: 52.00 EG
Property damage: 1.50K
Reported by: Law Enforcement

Large tree branches were reported down, taking down power lines along East 102nd Street in the Canarsie section of Brooklyn.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 29-JUL-11 17:15:00 to 29-JUL-11 17:20:00 (EST-5)
Location: THORNWOOD
Magnitude: 56.00 EG
Property damage: 7.50K
Reported by: Newspaper

Multiple trees were reported down along the Saw Mill River Parkway from near Exit 29 to near Exit 32.

Thunderstorm Wind in ORANGE, NEW YORK
From 29-JUL-11 16:10:00 to 29-JUL-11 16:10:00 (EST-5)
Location: VAILS GATE
Magnitude: 61.00 EG
Property damage: 10.00K
Reported by: Newspaper

Multiple large trees were reported down near Vails Gate.

Thunderstorm Wind in ORANGE, NEW YORK
From 29-JUL-11 15:53:00 to 29-JUL-11 15:53:00 (EST-5)
Location: SCOTCHTOWN
Magnitude: 61.00 EG
Property damage: 2.00K
Reported by: Law Enforcement

A large tree was reported down at the intersection of Johns Road and Howard Drive near Scotchtown.

Funnel Cloud in ROCKLAND, NEW YORK
From 29-JUL-11 16:57:00 to 29-JUL-11 16:57:00 (EST-5)
Location: WEST HAVERSTRAW
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A funnel cloud was reported near the intersection of Railroad Avenue and Route 9W near West Haverstraw.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 29-JUL-11 17:25:00 to 29-JUL-11 17:25:00 (EST-5)
Location: ELMSFORD
Magnitude: 61.00 EG
Property damage: 7.50K
Reported by: Emergency Manager

Numerous trees and wires were reported down throughout Elmsford.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 29-JUL-11 17:04:00 to 29-JUL-11 17:08:00 (EST-5)
Location: CROTONVILLE
Magnitude: 70.00 EG
Property damage: 150.00K
Reported by: NWS Storm Survey

A storm survey team consisting of meteorologists from the National Weather Service and staff from the Westchester Office of Emergency Management conducted a ground and aerial survey of wind damage from thunderstorms on Friday July 29th. Based on information gathered during the survey and conversations with local residences, the damage is being attributed to a microburst.  The microburst had estimated maximum gusts of 80 mph associated with it, a path length of about 1.4 miles, and a maximum path width of 0.4 miles.
Damage from this microburst began on the Croton River along Route 9 and spread south-southeast towards central Ossining.  The damage consisted primarily of snapped trees.  A large 3-4 foot diameter tree fell on Route 9 near Eagle Bay Drive taking down power lines that resulted in the snapping of several telephone poles.  Significant tree damage occurred at Cedar Lane Terrace at 6 Meadowbrook Drive. The tree damage was noted in a divergent pattern.

Tornado in ORANGE, NEW YORK
From 29-JUL-11 15:57:00 to 29-JUL-11 16:15:00 (EST-5)
Location: KIPPS
Tornado F-scale: EF1
Property damage: 50.00K
Reported by: NWS Storm Survey

Based on a storm survey performed by the National Weather Service, radar signatures, and eyewitness reports, the National Weather Service confirmed an EF-1 tornado that ran from Goshen to Blooming Grove NY, on Friday July 29th.
The tornado touched down near 109 Coleman Road and lifted near 600 Craigsville Road in Goshen, then skipped along near Craigsville Road, before finally lifting near 379 Prospect Road in Blooming Grove.  All along this path, trees converged into a well-defined narrow path. The most significant property damage occurred on Hasbrouck Road in Goshen, where 2 houses directly across the street from one another - 101 and 110 Hasbrouck - were impacted.  At 101 Hasbrouck Road, roof shingles were torn off, skylight windows were blown in with glass shattering, and debris was embedded all along the sides of the house including a small branch that went right through a gutter.  At 110 Hasbrouck Road, trees were draped all over the house with minor structural damage.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 29-JUL-11 17:00:00 to 29-JUL-11 17:00:00 (EST-5)
Location: CROTON ON HUDSON
Magnitude: 56.00 EG
Property damage: 75.00K
Reported by: Newspaper

Multiple trees were reported down around Croton-on-Hudson, including on 4 homes and several cars.