A major winter storm affected the mid-Atlantic from January 31 to February 2, 2021. Low pressure tracking out of the Ohio Valley weakened as it moved slowly eastward on the 31st. Meanwhile, as that low weakened, secondary low pressure began to develop off the coast of the Carolinas and tracked northward, just off the mid-Atlantic coast. The low steadily intensified as it moved up the coast in a classic ���Miller B��� storm evolution. The result was a significant and unusually long duration winter storm. Overrunning precipitation associated with the initial low over the Ohio Valley impacted the region on the 31st. A cold antecedent air mass allowed most of this precipitation to fall as snow. This produced widespread snow accumulation, though the overrunning precipitation was mostly of the light to moderate variety. Some areas experienced a lull in precipitation on the overnight of the 31st as the secondary low began to develop and a dry slot overspread a large area. In addition, a surge of warmer air both at the surface and aloft caused precipitation to change to sleet or rain in some areas, especially locations farthest south and east such as the Delmarva peninsula and southern New Jersey. However, as the secondary low strengthened, heavy precipitation developed on February 1, with intense banding and areas of extreme snowfall rates of 2 to 4 inches per hour in northern New Jersey and portions of eastern Pennsylvania. Precipitation eventually turned back to snow all the way to the coastline as colder air was drawn in from the north. The secondary low pressure nearly stalled off the mid-Atlantic coast, causing snow to continue into February 2, although by then snowfall rates were much lighter and additional accumulation was limited. Areas where precipitation remained all snow and that experienced the heavy banding saw extreme snowfall totals, with isolated amounts of near 3 feet of snow and a fairly widespread swath of in excess of 2 feet. Snow flurries even continued into February 3 around the backside of the slow moving low���s large circulation, before it finally departed and brought an end to one of the region���s most notable snow events in years.

High Wind in EASTERN OCEAN, NEW JERSEY
From 01-FEB-21 08:00:00 to 01-FEB-21 18:00:00 (EST-5)
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter near Point Pleasant Beach reported a 63 mph wind gust. Numerous measured wind gusts over 50 mph were recorded along coastal Ocean County.

Winter Storm in WARREN, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snow began on January 31 and continued into the new month. Snow became heavy on February 1 as intense banding developed. Lighter snow continued into February 2. A CoCoRaHS observer near Blairstown reported a storm total snowfall of 32.1 inches. Numerous other 24 to 32 inch snow reports were received across the county from the major and long duration winter storm.

Winter Weather in EASTERN OCEAN, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer in Point Pleasant Beach reported a storm total of 4.1 inches of snow. Most of this fell during mixed precipitation changing to snow on February 1, but an inch or two had likely occurred during light snow on January 31.

Winter Storm in SUSSEX, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow began across the county on January 31 and continued into the new month. Snow became heavy on February 1 as intense banding developed. Lighter snow continued into February 2. By the end of the event, a trained spotter in Andover had amassed a storm total snowfall of 32.0 inches. Numerous other reports of 24 to 32 inches were received from across the county in this major and long duration winter storm.

Winter Storm in MORRIS, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Snow began across the county on January 31 and continued into the new month. Snow became heavy on February 1 as intense banding developed and snowfall rates exceeded 2 to 3 inches per hour for several hours, with Morris County seeing some of the heaviest snow in the area. Lighter snow continued into February 2. By the end of the long duration event, a broadcast media source reported 35.1 inches of snow in Mount Arlington. Numerous other reports of 24 to 32 inches of snow were reported from this major winter storm.

Winter Storm in HUNTERDON, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow began on January 31 and continued into the new month. Snow became heavy on February 1 as intense banding and high snowfall rates developed. Lighter snow continued into February 2 before the major and long duration winter storm departed. A storm total snowfall of 24.0 inches was reported in Bethlehem Twp. Numerous other reports of 15 to 20 inches of snow were received from across the county.

Winter Storm in SOMERSET, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snow began in the county on January 31 and continued into the new month. Snow became heavy on February 1 as intense banding and high snowfall rates developed. Lighter snow continued into February 2. By the end of the major and long duration winter storm, a CoCoRaHS observer near Franklin Twp reported a storm total snowfall of 23.1 inches. Numerous other 16 to 22 inch snowfall reports were received.

Winter Storm in MERCER, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with sleet for a time before changing back to snow later on February 1, when it also became heavy at times. Lighter snow continued into February 2. By the end of the event, a storm total snowfall of 13.6 inches was reported in Princeton. Numerous other reports of 8 to 12 inches of snow were received across the county from the long duration storm.

Winter Storm in MIDDLESEX, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with sleet for a time before changing back to snow later on February 1, when it also became heavy at times as intense banding and high snowfall rates developed. Lighter snow continued into February 2. A storm total snowfall of 19.7 inches was reported in Metuchen. Numerous other reports of 12 to 18 inches of snow were received from across the county as a result of this major and long duration winter storm.

Winter Storm in WESTERN MONMOUTH, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with sleet for a time before changing back to snow later on February 1, when it also became heavy at times as intense banding developed. Lighter snow continued into February 2. By the time snow ended, a storm total snowfall of 17.0 inches was reported from near Holmdel. Several other reports of 10 to 15 inches of snow were received from the long duration winter storm.

Winter Storm in EASTERN MONMOUTH, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with sleet for a time before changing back to snow later on February 1, when it also became heavy at times. Lighter snow continued into February 2. A storm total snowfall of 9.1 inches was reported by a CoCoRaHS observer near Long Branch.

Winter Storm in NORTHWESTERN BURLINGTON, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with sleet and rain for a time before changing back to snow later on February 1, with lighter snow continuing into February 2. A storm total snowfall of 11.0 inches was reported by a trained spotter in Burlington, with numerous other reports of 6 to 10 inches of snow from the long duration winter storm.

Winter Storm in WESTERN OCEAN, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 16:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with rain and sleet for a time before changing back to snow later on February 1. Light snow continued into February 2. A storm total snowfall of 9.4 inches was reported in Jackson, with several other reports of 5 to 9 inches of snow across the county.

Winter Storm in CAMDEN, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 12:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with rain and sleet for a time before changing back to snow later on February 1. Light snow continued into February 2. A trained spotter near Gibbsboro reported a storm total snowfall of 10.6 inches from the long duration winter storm. Numerous other reports of 6 to 10 inches were received.

Winter Storm in GLOUCESTER, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 12:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with rain and sleet for a time before changing back to snow later on February 1. Light snow continued into February 2. A storm total snowfall of 9.8 inches was reported in Pitman. Several other reports of 5 to 9 inches of snow were received from the long duration storm.

Winter Storm in SALEM, NEW JERSEY
From 01-FEB-21 00:00:00 to 02-FEB-21 12:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Snow began on January 31. Precipitation continued into February 1. It decreased in intensity and also mixed with rain and sleet for a time before changing back to snow later on February 1. Light snow continued into February 2. A CoCoRaHS observer in Woodstown reported a storm total of 7.7 inches of snow from the long duration storm.