A shortwave rotating around a deep upper trough over New England acted on warm humid air in place at the surface to allow for supercell thunderstorms to form and track across the Lower Hudson Valley and Long Island.  These storms were prolific hail producers and also caused flash flooding.

Hail in ORANGE, NEW YORK
From 26-JUN-09 14:58:00 to 26-JUN-09 14:58:00 (EST-5)
Location: NEWBURGH
Magnitude: 1.00 
Reported by: Emergency Manager

Quarter Size hail was reported in Newburgh.

Hail in ORANGE, NEW YORK
From 26-JUN-09 15:55:00 to 26-JUN-09 15:55:00 (EST-5)
Location: TRISTATES
Magnitude: 0.88 
Reported by: Emergency Manager

Nickel size hail was reported in Port Jervis.

Hail in WESTCHESTER, NEW YORK
From 26-JUN-09 16:05:00 to 26-JUN-09 16:05:00 (EST-5)
Location: TUCKAHOE
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported in Eastchester.

Thunderstorm Wind in SUFFOLK, NEW YORK
From 26-JUN-09 18:05:00 to 26-JUN-09 18:05:00 (EST-5)
Location: BEIXEDON ESTATES
Magnitude: 52.00 EG
Property damage: 1.50K
Reported by: Fire Department/Rescue

Large diameter tree limbs were reported down in Southold.

Lightning in ORANGE, NEW YORK
From 26-JUN-09 15:30:00 to 26-JUN-09 15:30:00 (EST-5)
Location: WASHINGTON HGTS
Property damage: 30.00K
Reported by: Newspaper

Lightning struck a barn on Maples Road (at the Maples Farm) in Walkill causing a fire.

Lightning in ORANGE, NEW YORK
From 26-JUN-09 15:30:00 to 26-JUN-09 15:30:00 (EST-5)
Location: CIRCLEVILLE
Property damage: 5.00K
Reported by: Newspaper

Lightning struck a shed NW of Circleville causing a fire.

Flash Flood in ORANGE, NEW YORK
From 26-JUN-09 15:35:00 to 26-JUN-09 15:50:00 (EST-5)
Location: WASHINGTON HGTS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Portions of Route 17 in Middletown were impassable due to flooding.

Hail in SUFFOLK, NEW YORK
From 26-JUN-09 17:34:00 to 26-JUN-09 17:34:00 (EST-5)
Location: MT SINAI
Magnitude: 0.75 
Reported by: Trained Spotter

Penny size hail was reported in Mount Sinai.

Hail in SUFFOLK, NEW YORK
From 26-JUN-09 17:41:00 to 26-JUN-09 17:41:00 (EST-5)
Location: EAST SETAUKET
Magnitude: 1.50 
Reported by: NWS Employee

Ping-Pong ball size hail was reported in Setauket-East Setauket.

Hail in SUFFOLK, NEW YORK
From 26-JUN-09 17:27:00 to 26-JUN-09 17:27:00 (EST-5)
Location: STONY BROOK
Magnitude: 1.00 
Reported by: Trained Spotter

Nickel to quarter size hail was reported in Stony Brook.

Hail in SUFFOLK, NEW YORK
From 26-JUN-09 17:32:00 to 26-JUN-09 17:32:00 (EST-5)
Location: EAST SETAUKET
Magnitude: 1.00 
Reported by: Trained Spotter

Quarter size hail was reported in Setauket-East Setauket.

Hail in SUFFOLK, NEW YORK
From 26-JUN-09 17:30:00 to 26-JUN-09 17:30:00 (EST-5)
Location: CENTEREACH
Magnitude: 0.75 
Reported by: Public

Penny size hail was reported in Centereach.

Heavy Rain in WESTCHESTER, NEW YORK
From 26-JUN-09 16:30:00 to 26-JUN-09 18:00:00 (EST-5)
Location: YORKTOWN HGTS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

One and a half inches of rain fell in 90 minutes between 5:30 pm and 7 pm.

Thunderstorm Wind in ORANGE, NEW YORK
From 26-JUN-09 14:55:00 to 26-JUN-09 14:55:00 (EST-5)
Location: OTISVILLE
Magnitude: 61.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple trees down on wires were reported in Otisville.