Low pressure developed over the Ohio Valley and Middle Atlantic on Sunday, January 31, 2021. The low then consolidated along the Middle Atlantic coast early on Monday, February 1, 2021 and intensified as it slowly tracked to the north-northeast. The low meandered slowly north as it moved along the northeast and New England coast later on Monday February 1, 2021 through Wednesday, February 3, 2021. The low brought a major winter storm to Southeast New York, with the most significant impacts occurring on Monday, February 1, 2021.  3 to 6 inches of snow had already accumulated across the New York City metro by the start of the morning commute. Near blizzard conditions then occurred through the rest of the morning into the early afternoon with snowfall rates of 1 to 3 inches per hour. Strong winds combined with these heavy snow rates to produce visibilities one quarter mile or less at times. The heavier bands of snow lifted north across the rest of southeast New York in the afternoon. Some warmer air moved over portions of New York City and Long Island late on Monday, February 1, 2021, which change the snow to sleet and even some light rain early Tuesday, February 2, 2021. Colder air returned however later Tuesday, February 2, 2021, changing all lingering precipitation to light snow. Light snow bands lingered across some of Southeast New York through the early morning hours on February 3, 2021. Snowfall totals ranged from 4 to 10 inches across eastern Long Island, with the rest of southeast New York receiving 12 to 18 inches of snow. Portions of the Lower Hudson Valley observed 20 inches of snow with some locations observing around two feet. Winds gusted 40 to 55 mph at times on Monday, February 1, 2021, which caused power outages. Travel was also severely impacted as many flights were cancelled  and travel by train was suspended. New York City issued a Winter Weather Emergency Declaration restricting all non-emergency travel on Monday, February 1, 2021. COVID testing and vaccination sites were closed. Impacts were limited on February 2, 2021 and February 3, 2021 as the snow was largely light.

Winter Storm in ORANGE, NEW YORK
From 01-FEB-21 00:00:00 to 02-FEB-21 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters, COOP Observer, and Fire Department/Rescue reported 18 to 23 inches of snow. A trained spotter 2 miles north of Orange Lake reported 22.3 inches of snow. A COOP observer in Port Jervis reported 22 inches of snow. Fire Department/Rescue reported 20.4 inches of snow in Middletown. The Montgomery Airport ASOS measured a 39 mph wind gust at 4:10 pm and then again at 11:11 pm on February 1, 2021.

Winter Storm in PUTNAM, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio reported 19.5 inches of snow in Cold Spring. Trained spotters, broadcast media, and COOP Observer reported 13 to 18 inches of snow. The nearby Danbury Connecticut Airport ASOS measured a 38 mph wind gust at 7:14 pm February 1, 2021.

Winter Storm in ROCKLAND, NEW YORK
From 01-FEB-21 00:00:00 to 02-FEB-21 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and the public reported 15 to 22 inches of snow. The public reported 22.2 inches of snow in Monsey and a trained spotter i mile north-northwest of Stony Point reported 20.6 inches of snow. A 46 mph wind gust was observed at the nearby White Plains airport at 4:56 pm February 1, 2021.

Winter Storm in NORTHERN WESTCHESTER, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 11:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and amateur radio reported 14 to 20 inches of snow. A 46 mph wind gust was recorded by the White Plains Airport ASOS at 4:56 pm February 1, 2021.

Winter Storm in SOUTHERN WESTCHESTER, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 09:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters reported 12 to 18 inches of snow. A 46 mph wind gust was recorded by the nearby White Plains Airport ASOS at 4:56 pm February 1, 2021.

Winter Storm in NEW YORK (MANHATTAN), NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 05:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Official NWS Observation at Central Park was 17.4 inches of snow. The Midtown Manhattan New York State Mesonet Station measured a 50 mph wind gust at 11:35 am February 1, 2021.

Winter Storm in BRONX, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A COOP observer in Parkchester reported 18.2 inches of snow. A 45 mph wind gust was measured by the LaGuardia Airport ASOS at 5:51 pm February 1, 2021.

Winter Storm in KINGS (BROOKLYN), NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An Emergency Manager reported 18.2 inches of snow in Bay Ridge. A trained spotter 2 miles east-northeast of Coney Island measured 16.0 inches of snow. Broadcast media reported 15.8 inches of snow 1 mile south-southwest of Flatbush.  A 51 mph wind gust was measured at 8:20 pm February 1, 2021 by the New York State Mesonet Station 1 mile south-southwest of Flatbush.

Winter Storm in RICHMOND (STATEN IS.), NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 05:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported 16.9 inches of snow in Westerleigh. The New York State Mesonet Station 1 mile west of Willobrook measured a 44 mph wind gust at 10:55 am February 1, 2021.

Winter Storm in SOUTHERN QUEENS, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Official NWS Observation at Kennedy International Airport was 12.6 inches of snow, and a 2 inch per hour snowfall rate was reported from 12 pm to 1 pm on February 1, 2021.  12 to 17 inches of snow was reported by Trained Spotters and the Public throughout Southern Queens. A 51 mph wind gust was measured by the Kennedy International Airport ASOS at 3:51 pm February 1, 2021.

Winter Storm in NORTHERN NASSAU, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and the public reported 12 to 17 inches of snow. The nearby Farmingdale Airport measured a 48 mph wind gust at 4:53 pm on February 1, 2021.

Winter Storm in SOUTHERN NASSAU, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotters and the public reported 10 to 15 inches of snow. The Wantagh New York State Mesonet Station measured a 50 mph wind gust at 6:05 pm on February 1, 2021.

Winter Storm in NORTHWEST SUFFOLK, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

COOP Observers 1 mile south of Centerport and 1 mile northwest of Mount Sinai reported 15.1 and 15.0 inches of snow respectively. An NWS Employee reported 14.3 inches of snow in Stony Brook.  Trained spotters and the public reported 12 to 17 inches of snow across Northwest Suffolk. The nearby Islip Airport measured a 2 inch per hour snowfall rate between 9 am and 10 am on February 1, 2021. The nearby Islip Airport ASOS measured a 54 mph wind gust at 5:56 pm on February 1, 2021.

Winter Storm in SOUTHWEST SUFFOLK, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Official NWS Observation at the Islip Airport was 11.7 inches of snow. The Islip Airport also measured a 2 inch per hour snowfall rate between 9 am and 10 am on February 1, 2021. CoCoRaHS, trained spotters, and the public reported 10 to 16 inches of snow.  The Islip Airport ASOS measured a 54 mph wind gust at 5:56 pm on February 1, 2021.

Winter Storm in NORTHEAST SUFFOLK, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A COOP Observer 3 miles north-northeast of Calverton reported 14.8 inches of snow.  The NWS Office in Upton reported 14.8 inches of snow. A trained spotter in Mattituck reported 11.0 inches of snow. The Southold New York Mesonet Station measured a 45 mph wind gust at 7:00 pm February 1, 2021.

Winter Storm in SOUTHEAST SUFFOLK, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 10:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public and trained spotters reported 5 to 10 inches of snowfall. A COOP observer in Bridgehampton reported 4.5 inches of snow. The Westhampton Airport ASOS measured a 53 mph wind gust at 6:53 pm on February 1, 2021.

Winter Storm in NORTHERN QUEENS, NEW YORK
From 01-FEB-21 00:00:00 to 03-FEB-21 07:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

The Official NWS Observation at LaGuardia Airport was 14.3 inches of snow. 14 to 18 inches of snow was reported by trained spotters and the public throughout Northern Queens. A 45 mph wind gust was measured by the LaGuardia Airport ASOS at 5:51 pm February 1, 2021.