A surface low with its associated warm front approached the area early in the morning before partially lifting through. This boundary provided the focus for very heavy rain in an extremely moist air mass and resulted in historic flash flooding on Long Island.  New York State's 24 hour rainfall record was broken with 13.78 inches of rainfall being reported by the Automated Surface Observing System at Islip MacArthur Airport.

Flash Flood in NASSAU, NEW YORK
From 13-AUG-14 02:58:00 to 13-AUG-14 04:45:00 (EST-5)
Location: (FRG)FARMINGDALE ARP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Route 110 was closed due to flooding between Route 109 and Ruland Rd. in East Farmingdale.  Storm total rainfall amounts reported in Nassau County ranged from 0.98 inches in Malverne to 8.20 inches in Massapequa.

Flash Flood in NASSAU, NEW YORK
From 13-AUG-14 03:25:00 to 13-AUG-14 04:45:00 (EST-5)
Location: JERICHO
Flood cause: Heavy Rain
Property damage: 3.50K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

All lanes were closed on the Northern State Parkway at exit 35 in Jericho due to flooding.  Damage costs were provided by the Town of Oyster Bay for pump out operations and minor roof repairs.  However, there was likely millions of dollars of damage in Nassau County as a result of this event.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 04:01:00 to 13-AUG-14 04:45:00 (EST-5)
Location: PINE AIRE
Flood cause: Heavy Rain
Property damage: 35.20M
Crop damage: 0.00K
Reported by: Broadcast Media

The Sagtikos Parkway southbound was closed at Exit S2, Crooked Hill Rd., in Brentwood due to flooding. Storm total rainfall amounts reported in Suffolk County ranged from 0.14 inches in Montauk to 13.27 inches at Islip/MacArthur Airport with a 24 hour rainfall record of 13.78 inches at MacArthur Airport which broke the New York State record.  Damage amounts are validated costs of damage assessment inspections of municipal property, $11.7 million, and $23.5 million for small business administration loans as a result of the FEMA private property and business damage assessment.  This information was provided by the Suffolk County Office of Emergency Management.

Flash Flood in NASSAU, NEW YORK
From 13-AUG-14 03:03:00 to 13-AUG-14 04:45:00 (EST-5)
Location: ARLYN OAKS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Sunrise Highway was closed between Carmans Rd. and Unqua Rd. in Massapequa due to flooding.

Flash Flood in NASSAU, NEW YORK
From 13-AUG-14 04:25:00 to 13-AUG-14 04:45:00 (EST-5)
Location: BETHPAGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The Seaford-Oyster Bay Expressway was closed at Powell Ave. in Bethpage due to flooding.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 05:30:00 to 13-AUG-14 08:15:00 (EST-5)
Location: WEST BABYLON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The Southern State Parkway was closed with cars stranded in high water at exit 37 in West Babylon.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 04:30:00 to 13-AUG-14 08:15:00 (EST-5)
Location: LAKE GROVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The local fire department deployed boats to rescue trapped vehicle occupants in Nesconset at the intersection of Nichols Rd. and Roy Dr.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 04:01:00 to 13-AUG-14 08:15:00 (EST-5)
Location: EAST HALF HOLLOW HIL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The westbound Long Island Expressway was closed between exits 51 and 50 in Dix Hills due to flooding.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 04:41:00 to 13-AUG-14 08:15:00 (EST-5)
Location: COMMACK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Jericho Turnpike was closed in both directions in Commack due to flooding.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 07:25:00 to 13-AUG-14 08:15:00 (EST-5)
Location: BAY SHR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Sunrise Highway and the Service Road at 5th Ave., exit 43, in Bayshore was closed due to flooding.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 04:42:00 to 13-AUG-14 08:15:00 (EST-5)
Location: EAST MORICHES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Sunrise Highway was closed at Railroad Ave. in Manorville due to flooding.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 05:10:00 to 13-AUG-14 08:15:00 (EST-5)
Location: SMITHTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The intersection of Route 25 and Maple Ave. in Smithtown was closed due to flooding.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 05:45:00 to 13-AUG-14 08:15:00 (EST-5)
Location: RONKONKOMA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated six to twelve inches of water was flowing at the intersection of Ronkonkoma Ave. and Waltess Rd. in Ronkonkoma.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 05:53:00 to 13-AUG-14 08:15:00 (EST-5)
Location: BAY SHR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Sunrise Highway was completely flooded with cars stranded in high water in front of the South Shore Mall in Bayshore.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 05:59:00 to 13-AUG-14 08:15:00 (EST-5)
Location: HOLTSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Cars were stuck in high water on both the northbound and southbound ramps from the eastbound Long Island Expressway to Nicholls Rd. in Holtsville.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 06:16:00 to 13-AUG-14 08:15:00 (EST-5)
Location: BABYLON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An estimated three feet of standing water accumulated on Livingston Ave. in Babylon.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 06:20:00 to 13-AUG-14 08:15:00 (EST-5)
Location: SOUND BEACH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Multiple cars were stuck in high water at the intersection of Hallock Landing Rd. and Culross Dr. in Rocky Point.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 06:23:00 to 13-AUG-14 08:15:00 (EST-5)
Location: AMITYVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Six to ten inches of flowing water accumulated on Union Ave. in Amityville.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 06:24:00 to 13-AUG-14 08:15:00 (EST-5)
Location: NORTH GREAT RIVER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

An estimated two feet of standing water accumulated on Lagoon Place in East Islip while water was up to the mailboxes on Argosy St. in Islip Terrace.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 06:26:00 to 13-AUG-14 08:15:00 (EST-5)
Location: LAKE GROVE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Browns Rd. in Nesconset was closed with two cars stuck in flood waters.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 06:51:00 to 13-AUG-14 08:15:00 (EST-5)
Location: BAY SHR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Two feet of standing water accumulated in the parking lot of the Bayshore train station in Bayshore.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 07:11:00 to 13-AUG-14 08:15:00 (EST-5)
Location: SELDEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A car was fully submerged in flood waters at the intersection of Blue Point Rd. and Middle Country Rd. in Selden.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 07:25:00 to 13-AUG-14 08:15:00 (EST-5)
Location: (ISP)MC ARTHUR FLD I
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Two cars were stuck in flood waters at the intersection of Union Ave. and Mill Rd. in Holbrook.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 07:30:00 to 13-AUG-14 08:15:00 (EST-5)
Location: WILDWOOD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

There was a partial collapse of the westbound lane of Hulse Landing Rd. between Route 25A and Sound Ave. in Wading River.

Flash Flood in SUFFOLK, NEW YORK
From 13-AUG-14 07:49:00 to 13-AUG-14 08:15:00 (EST-5)
Location: HAUPPAUGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The Long Island Expressway was closed at exit 57 in Islandia due to flooding.