The development of the blizzard/winter storm began along the southeast coast on Wednesday January 3, 2018. An amplifying upper level trough spawned the development of low pressure off the coast of Florida. The low pressure rapidly intensified on Wednesday night through Thursday January 4, 2018 as it moved north-northeast along the coast. The low passed just east of the 40��N 70��W benchmark Thursday afternoon. The central pressure when the storm developed was around 1004 millibars at 1 pm Wednesday. 24 hours later, the central pressure fell to around 950 mb, approximately a 54 millibar drop. The rapid intensification of the storm led to heavy snow, strong winds, and blizzard conditions over Long Island, and in Queens in New York City and the Lower Hudson Valley. Near-blizzard conditions occurred across Manhattan, the Bronx, and Brooklyn. Thundersnow was also observed across eastern Long Island.
Thousands of flights were cancelled on January 4, 2018 and nearly 900 were cancelled the day after the blizzard. System-wide delays and cancellations occurred on the Long Island Railroad and Metro North Railroad. There were also numerous accidents on across southeast New York.  Thousands of homes and businesses also lost power.

Blizzard in NORTHEAST SUFFOLK, NEW YORK
From 04-JAN-18 08:48:00 to 04-JAN-18 11:53:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The nearby Francis S. Gabreski Airport ASOS (Westhampton Beach, NY) observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and frequent wind gusts over 35 mph during the morning on January 4th.

Heavy Snow in ORANGE, NEW YORK
From 04-JAN-18 07:00:00 to 04-JAN-18 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and the public reported 6 to 8.5 inches of snowfall.

Winter Storm in ROCKLAND, NEW YORK
From 04-JAN-18 05:30:00 to 04-JAN-18 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported 7 inches of snowfall in Nyack. Winds also gusted between 40 and 45 MPH during the afternoon on January 4, 2018 at the New York State Mesonet in Viola.

Winter Storm in PUTNAM, NEW YORK
From 04-JAN-18 06:00:00 to 04-JAN-18 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A COOP Observer reported 10 inches of snow in Carmel. Elsewhere across the county, trained spotters and the broadcast media reported 6 to 8 inches of snow. Winds gusts to 40 MPH at nearby Danbury Airport at 3:21 PM.

Winter Storm in NORTHERN WESTCHESTER, NEW YORK
From 04-JAN-18 04:00:00 to 04-JAN-18 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire Department/Rescue reported 9.6 inches of snowfall in Armonk. The Westchester County Airport ASOS in White Plains, NY reported a 58 MPH wind gust at 1:53 PM.

Winter Storm in SOUTHERN WESTCHESTER, NEW YORK
From 04-JAN-18 05:00:00 to 04-JAN-18 18:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and the public reported 8 to 12.0 inches of snow. The Westchester County Airport ASOS in White Plains, NY reported a 58 MPH wind gust at 1:53 PM.

Blizzard in SOUTHERN WESTCHESTER, NEW YORK
From 04-JAN-18 08:56:00 to 04-JAN-18 14:56:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Westchester County Airport (White Plains, NY) ASOS observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and frequent wind gusts over 35 mph during the morning and early afternoon on January 4th.

Winter Storm in BRONX, NEW YORK
From 04-JAN-18 05:00:00 to 04-JAN-18 18:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported 11.2 inches of snow in Bedford Park and 10.7 inches in Morris Park.  The nearby La Guardia International Airport ASOS measured a 52 MPH wind gust at 6:04 PM and frequently gusted 40 to 50 MPH through the peak of the winter storm.

Winter Storm in NORTHERN QUEENS, NEW YORK
From 04-JAN-18 05:00:00 to 04-JAN-18 18:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters, the public, and CoCoRaHS observers reported 7 to 11 inches of snow. The FAA Contract Observer at La Guardia International Airport reported 7.4 inches of snow. The La Guardia International Airport ASOS measured a 52 MPH wind gust at 6:04 PM and frequently gusted 40 to 50 MPH through the peak of the winter storm.

Blizzard in NORTHERN QUEENS, NEW YORK
From 04-JAN-18 07:51:00 to 04-JAN-18 14:51:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The La Guardia Airport ASOS observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and blowing snow, and frequent wind gusts over 35 mph during the morning and early afternoon on January 4th.

Blizzard in SOUTHERN QUEENS, NEW YORK
From 04-JAN-18 08:10:00 to 04-JAN-18 13:43:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The nearby Republic Airport (East Farmingdale, NY) ASOS observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and frequent wind gusts over 35 mph during the morning and afternoon on January 4th.

Winter Storm in RICHMOND (STATEN IS.), NEW YORK
From 04-JAN-18 05:00:00 to 04-JAN-18 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Public reported 10.8 inches of snow in Great Kills and 10.2 inches of snow in Dongan Hills. Nearby ASOS observations at Newark Liberty International and Kennedy International showed winds frequently gusting 40 to 50 MPH during the peak of the winter storm.

Winter Storm in KINGS (BROOKLYN), NEW YORK
From 04-JAN-18 03:00:00 to 04-JAN-18 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observers, amateur radio, trained spotters, and the public reported 7 to 12 inches of snow. Wind observations at nearby Kennedy International Airport frequently gusted 40 to 50 MPH during the peak of the storm.

Winter Storm in NEW YORK (MANHATTAN), NEW YORK
From 04-JAN-18 05:00:00 to 04-JAN-18 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Official NWS Observation at Central Park Conservancy reported 9.8 inches of snowfall. The Central Park ASOS reported wind gusts 30 to 35 MPH during the peak of the winter storm.

Winter Storm in SOUTHERN QUEENS, NEW YORK
From 04-JAN-18 03:00:00 to 04-JAN-18 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observers, trained spotters, and the public reported 8 to 14 inches of snow. The FAA Contract Observer at Kennedy International Airport reported 8 inches of snow. The Kennedy International Airport ASOS measured a 52 MPH wind gust at 6:37 PM. Winds frequently gusted 40 to 50 MPH during the peak of the storm.

Winter Storm in NORTHERN NASSAU, NEW YORK
From 04-JAN-18 02:00:00 to 04-JAN-18 20:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters, CoCoRaHS observers, and the public reported 7 to 12 inches of snowfall. The nearby Republic Airport ASOS in East Farmingdale measured a 59 MPH wind gust at 12:06 PM. Winds frequently gusted 40  to 50 MPH during the peak of the winter storm.

Blizzard in NORTHERN NASSAU, NEW YORK
From 04-JAN-18 08:06:00 to 04-JAN-18 15:31:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The nearby Republic Airport (East Farmingdale, NY) ASOS observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and frequent wind gusts over 35 mph during the morning and afternoon on January 4th.

Blizzard in SOUTHERN NASSAU, NEW YORK
From 04-JAN-18 08:06:00 to 04-JAN-18 15:31:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Westchester County Airport (White Plains, NY) ASOS observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and frequent wind gusts over 35 mph during the morning and early afternoon on January 4th.

Winter Storm in SOUTHERN NASSAU, NEW YORK
From 04-JAN-18 02:00:00 to 04-JAN-18 20:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters, Amateur radio, and the public reported 10 to 16 inches of snowfall. The nearby Republic Airport ASOS in East Farmingdale measured a 59 MPH wind gust at 12:06 PM. The New York Mesonet Station in Wantagh measured a 43 MPH wind gust at 7:20 PM.

Winter Storm in NORTHWEST SUFFOLK, NEW YORK
From 04-JAN-18 03:00:00 to 04-JAN-18 20:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observers, trained spotters, and the public reported 10 to 16 inches of snowfall. The nearby Republic Airport ASOS in East Farmingdale measured a 59 MPH wind gust at 12:06 PM. Winds frequently gusted 40 to 50 MPH during the peak of the winter storm.

Blizzard in NORTHWEST SUFFOLK, NEW YORK
From 04-JAN-18 07:56:00 to 04-JAN-18 13:40:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Long Island MacArthur Airport (Islip, NY) ASOS observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and frequent wind gusts over 35 mph during the morning and afternoon on January 4th.

Winter Storm in SOUTHWEST SUFFOLK, NEW YORK
From 04-JAN-18 03:00:00 to 04-JAN-18 20:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The FAA Contract Observer at Long Island MacArthur Airport (Islip, NY) reported 15.8 inches of snow. Trained spotters, CoCoRaHS observers, and the public reported 10 to 16 inches of snow. Winds frequently gusted 40 to 50 MPH during the peak of the winter storm at the Long Island MacArthur Airport.

Blizzard in SOUTHWEST SUFFOLK, NEW YORK
From 04-JAN-18 07:56:00 to 04-JAN-18 13:40:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Long Island MacArthur Airport (Islip, NY) ASOS observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and blowing snow, and frequent wind gusts over 35 mph during the morning and afternoon on January 4th.

Winter Storm in SOUTHEAST SUFFOLK, NEW YORK
From 04-JAN-18 04:00:00 to 04-JAN-18 22:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The NWS Office in Upton, NY reported 12.3 inches of snow. Trained spotters, CoCoRaHS observers, and the public reported 10 to 14 inches of snow. The nearby Brookhaven Airport ASOS (Shirley, NY) measured a 54 MPH wind gust at 3:24 PM. The nearby Gabreski Airport ASOS (Westhampton Beach, NY) measured a 49 MPH wind gust at 5:59 PM. Winds also frequently gusted 40 to 50 MPH during the peak of the winter storm.

Blizzard in SOUTHEAST SUFFOLK, NEW YORK
From 04-JAN-18 08:48:00 to 04-JAN-18 11:53:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Francis S. Gabreski Airport ASOS (Westhampton Beach, NY) observations showed blizzard conditions, with visibility less than one quarter mile in heavy snow and frequent wind gusts over 35 mph during the morning on January 4th.

Winter Storm in NORTHEAST SUFFOLK, NEW YORK
From 04-JAN-18 04:00:00 to 04-JAN-18 22:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and CoCoRaHS observers, and the public reported 10 to 14 inches of snowfall. The nearby Brookhaven Airport ASOS (Shirley, NY) measured a 54 MPH wind gust at 3:24 PM. Winds also frequently gusted 40 to 50 MPH during the peak of the winter storm.