A powerful cold front produced numerous severe thunderstorms across Connecticut, Long Island and the Lower Hudson Valley of New York.  Some of the storms were very heavy rain producers, training across the same area, which caused isolated flash flooding on Long Island.

Hail in NASSAU, NEW YORK
From 07-JUL-09 23:01:00 to 07-JUL-09 23:01:00 (EST-5)
Location: LOCUST VLY
Magnitude: 0.88 
Reported by: Emergency Manager

Nickel size hail was reported by emergency management officials.

Hail in WESTCHESTER, NEW YORK
From 07-JUL-09 22:40:00 to 07-JUL-09 22:40:00 (EST-5)
Location: FLEETWOOD
Magnitude: 1.00 
Reported by: Public

Quarter size hail was reported.

Hail in NASSAU, NEW YORK
From 07-JUL-09 23:01:00 to 07-JUL-09 23:01:00 (EST-5)
Location: LOCUST VLY
Magnitude: 0.88 
Reported by: Emergency Manager

Nickel size hail was reported by emergency management officials.

Hail in NASSAU, NEW YORK
From 07-JUL-09 23:06:00 to 07-JUL-09 23:06:00 (EST-5)
Location: MILL NECK
Magnitude: 0.75 
Reported by: Trained Spotter

Penny size hail was reported by a trained spotter.

Thunderstorm Wind in NASSAU, NEW YORK
From 07-JUL-09 23:10:00 to 07-JUL-09 23:10:00 (EST-5)
Location: JERICHO
Magnitude: 52.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were downed by high winds.

Thunderstorm Wind in NASSAU, NEW YORK
From 07-JUL-09 23:10:00 to 07-JUL-09 23:10:00 (EST-5)
Location: LOCUST GROVE
Magnitude: 61.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were downed by thunderstorm winds.

Thunderstorm Wind in NASSAU, NEW YORK
From 07-JUL-09 14:40:00 to 07-JUL-09 14:40:00 (EST-5)
Location: SOUTH HEMPSTEAD
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were downed.

Hail in WESTCHESTER, NEW YORK
From 07-JUL-09 22:25:00 to 07-JUL-09 22:25:00 (EST-5)
Location: DUNWOODIE
Magnitude: 1.75 
Reported by: Trained Spotter

Golf ball size hail was reported by a trained spotter.

Hail in WESTCHESTER, NEW YORK
From 07-JUL-09 22:31:00 to 07-JUL-09 22:31:00 (EST-5)
Location: DUNWOODIE
Magnitude: 0.75 
Reported by: Public

Penny size hail was reported.

Hail in WESTCHESTER, NEW YORK
From 07-JUL-09 22:45:00 to 07-JUL-09 22:45:00 (EST-5)
Location: EAST CHESTER
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported by a trained spotter.

Hail in NASSAU, NEW YORK
From 07-JUL-09 22:59:00 to 07-JUL-09 22:59:00 (EST-5)
Location: GLEN COVE
Magnitude: 0.88 
Reported by: Emergency Manager

Nickel size hail was reported by emergency management officials.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 07-JUL-09 22:31:00 to 07-JUL-09 22:31:00 (EST-5)
Location: DUNWOODIE
Magnitude: 61.00 EG
Property damage: 5.00K
Reported by: Public

Numerous trees and branches were downed by thunderstorm winds.

Thunderstorm Wind in NASSAU, NEW YORK
From 07-JUL-09 23:01:00 to 07-JUL-09 23:01:00 (EST-5)
Location: BROOKVILLE
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were downed by thunderstorm winds.

Thunderstorm Wind in NASSAU, NEW YORK
From 07-JUL-09 23:15:00 to 07-JUL-09 23:15:00 (EST-5)
Location: JERICHO
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were downed by thunderstorm winds.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 07-JUL-09 23:13:00 to 07-JUL-09 23:13:00 (EST-5)
Location: DUNWOODIE
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Saw Mill River Parkway was closed due to downed trees.

Flash Flood in NASSAU, NEW YORK
From 07-JUL-09 15:30:00 to 07-JUL-09 15:45:00 (EST-5)
Location: SOUTH HEMPSTEAD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Long Beach Rd. was closed due to flooding.

Flash Flood in SUFFOLK, NEW YORK
From 07-JUL-09 16:00:00 to 07-JUL-09 16:15:00 (EST-5)
Location: NORTH BABYLON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Deer Park Ave. was closed at Sunrise Hwy. due to flooding.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 07-JUL-09 22:30:00 to 07-JUL-09 22:30:00 (EST-5)
Location: EAST CHESTER
Magnitude: 87.00 EG
Property damage: 1.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

A severe thunderstorm that produced storm damage in Bergen county in
northeastern New Jersey moved into Yonkers around 11:25 pm as the
storm intensified.  Doppler weather radar analysis would classify
the storm as a supercell with a strong mesocyclone at this time. A
large area of very strong downburst winds downed numerous large
trees that fell on structures, power lines and cars. The worst damage
observed in the area was in Trevor Park around the Hudson River
Museum where winds were estimated to have gusted up to 100 mph. Some minor damage appeared to occur to the roof of the Museum with a few shingles blown off. Nearly all trees appeared to have fallen to the east or southeast. The damage area extended east to North Broadway and into Grant Park on Park Ave where numerous large trees were also knocked over falling to the east or southeast. Downed large trees were also observed in Oakland Cemetery.
Downed trees were also observed in Mount Vernon along West Street
and Macquesten Parkway North where winds of 70 mph were estimated to
have occurred. Again, all trees appeared to fall to the southeast.
There was additional tree damage to a lesser degree to the north
observed along and near the Cross County Parkway.
In Bronxville, several trees were seen downed along the Bronx River
Parkway from exits 1 to 3. In Eastchester and Tuckahoe, several large
trees were downed in the vicinity of Ridge and Governors Roads. A
large tree here fell on power lines snapping a telephone pole in
half. Winds in this area were estimated at 80 mph.
In addition to the wind damage, there was extensive hail from the
storm along with torrential rain. The hail accumulated to several
inches in Yonkers and was still visible this morning. Rain swept the
hail into some locations to depth over a foot. In one location on
Hoover Road in northern Yonkers...up to 4 feet of hail accumulated
inside a home after the drainage became clogged.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 07-JUL-09 12:50:00 to 07-JUL-09 12:50:00 (EST-5)
Location: OLD FIELD
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was downed my thunderstorm winds.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 07-JUL-09 14:07:00 to 07-JUL-09 14:07:00 (EST-5)
Location: DERING HARBOUR
Magnitude: 60.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

Wires were downed near Hay Beach.

Thunderstorm Wind in NASSAU, NEW YORK
From 07-JUL-09 22:53:00 to 07-JUL-09 22:53:00 (EST-5)
Location: GLEN COVE
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were downed.

Thunderstorm Wind in NASSAU, NEW YORK
From 07-JUL-09 23:15:00 to 07-JUL-09 23:15:00 (EST-5)
Location: LOCUST GROVE
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were downed.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 07-JUL-09 15:00:00 to 07-JUL-09 15:00:00 (EST-5)
Location: AMITYVILLE ARPT
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Wires were downed by thunderstorm winds.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 07-JUL-09 22:44:00 to 07-JUL-09 22:44:00 (EST-5)
Location: LARCHMONT NORTH
Magnitude: 61.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Large trees were downed.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 07-JUL-09 22:31:00 to 07-JUL-09 22:31:00 (EST-5)
Location: TUCKAHOE
Magnitude: 61.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A tree was downed into a bedroom, injuring one woman.

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 07-JUL-09 22:45:00 to 07-JUL-09 22:45:00 (EST-5)
Location: EAST CHESTER
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in WESTCHESTER, NEW YORK
From 07-JUL-09 22:40:00 to 07-JUL-09 22:40:00 (EST-5)
Location: FLEETWOOD
Magnitude: 56.00 MG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Large trees were downed.