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.

Winter Weather in CUMBERLAND, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Hopewell Twp reported 4.0 inches on snow from the snow on January 31. Additional mixed precipitation occurred on February 1 and 2 but produced little additional snow accumulation.

Winter Weather in WESTERN ATLANTIC, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow fell across the county, mainly on January 31 but with some additional accumulation during mixed precipitation on February 1 and 2. Snow amounts varied widely through the county. Most areas received 1 to 4 inches of snow. However, isolated storm total amounts up to 8 inches were reported in Hamilton Twp and near Folsom.

Winter Weather in SOUTHEASTERN BURLINGTON, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow fell across southeast Burlington County on January 31. Additional mixed precipitation occurred on February 1 and 2 but produced little additional accumulation. Reports from the area were sparse, but observations from surrounding areas suggest 3 to 5 inches of snow fell, mainly on January 31.

Winter Weather in SUSSEX, NEW JERSEY
From 31-JAN-21 15:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in WARREN, NEW JERSEY
From 31-JAN-21 14:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in MORRIS, NEW JERSEY
From 31-JAN-21 15:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in HUNTERDON, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in SOMERSET, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in MERCER, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in MIDDLESEX, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in WESTERN MONMOUTH, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in EASTERN MONMOUTH, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in NORTHWESTERN BURLINGTON, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in WESTERN OCEAN, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in CAMDEN, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in GLOUCESTER, NEW JERSEY
From 31-JAN-21 13:00:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.

Winter Weather in SALEM, NEW JERSEY
From 31-JAN-21 12:30:00 to 31-JAN-21 23:59:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Snow began in the county on January 31 and continued into February 1 and 2, when the heaviest snow would fall.