A cold front moved through the mid-Atlantic on February 22, with a developing wave of low pressure tracking northeast along the front just inland from the Atlantic coast. This fast moving system brought a period of steady precipitation to the region mainly during the morning and midday hours on the 22nd. A cold air mass was in place ahead of the system, causing precipitation to start as snow. Southerly winds ahead of the cold front brought warmer air into the region, causing a change from snow to rain in many areas. Despite it being a fairly atypical setup for wintry precipitation in the region, a brief but intense period of snow affected much of eastern Pennsylvania and northern New Jersey. Several inches of heavy, wet snow fell in just a few hours, causing considerable disruption on area roadways.

Winter Weather in MONROE, PENNSYLVANIA
From 22-FEB-21 10:00:00 to 22-FEB-21 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A period of snow fell, which changed to freezing rain near the end of the event. A report of 4.6 inches of snow was received from Bartonsville. The Mount Pocono Airport (KMPO) ASOS reported 0.03 inches of ice accretion.

Winter Weather in CARBON, PENNSYLVANIA
From 22-FEB-21 09:45:00 to 22-FEB-21 14:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A period of snow fell. A report of 4.6 inches of snow was received from Albrightsville. Observations from surrounding areas suggest precipitation likely ended as a brief period of freezing rain, possibly producing up to a few hundredths of an inch of ice accretion.

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 22-FEB-21 10:00:00 to 22-FEB-21 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A period of snow fell, which was heavy at times. A report of 5.1 inches of snow was received from Bushkill Twp, with several other 4 to 5 inch reports from across the county.

Winter Weather in LEHIGH, PENNSYLVANIA
From 22-FEB-21 09:30:00 to 22-FEB-21 15:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A period of snow fell, which was heavy at times. A maximum report of 5.3 inches of snow was received from Coopersburg, with several other 4 to 5 inch amounts reported. The Lehigh Valley International Airport (KABE) saw 4.1 inches of snow. A number of accidents and significant traffic disruption occurred in and around the Allentown metro area as much of this snow fell within just a couple of hours, causing snow covered roadways despite marginal temperatures.

Winter Weather in BERKS, PENNSYLVANIA
From 22-FEB-21 09:00:00 to 22-FEB-21 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A period of snow fell, which was heavy at times. Separate reports of 5.0 inches of snow were received from Huffs Church, Hamburg, and Mohnton. Precipitation also ended as light freezing rain, with 0.01 inches of ice accretion measured by the ASOS at Reading Regional Airport (KRDG).

Winter Weather in UPPER BUCKS, PENNSYLVANIA
From 22-FEB-21 09:45:00 to 22-FEB-21 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A period of snow fell, which was heavy at times, before ending as rain. A trained spotter in Chalfont reported 4.8 inches of snow.

Winter Weather in LOWER BUCKS, PENNSYLVANIA
From 22-FEB-21 09:45:00 to 22-FEB-21 13:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A period of snow fell, which was heavy at times before ending as rain. A report of 5.5 inches of snow was received from Buckingham Twp, with several other 4 to 5 inch reports.

Winter Weather in WESTERN MONTGOMERY, PENNSYLVANIA
From 22-FEB-21 09:30:00 to 22-FEB-21 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A period of snow fell, which was heavy at times, before briefly ending as rain. A trained spotter in Skippack reported 5.5 inches of snow.

Winter Weather in EASTERN MONTGOMERY, PENNSYLVANIA
From 22-FEB-21 09:45:00 to 22-FEB-21 14:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A period of snow fell, which was heavy at times before ending briefly as rain. A trained spotter in Norristown reported 5.4 inches of snow.

Winter Weather in WESTERN CHESTER, PENNSYLVANIA
From 22-FEB-21 09:00:00 to 22-FEB-21 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A period of snow fell, which was heavy at times before ending briefly as rain. A trained spotter in East Coventry Twp reported 5.1 inches of snow.

Winter Weather in EASTERN CHESTER, PENNSYLVANIA
From 22-FEB-21 09:15:00 to 22-FEB-21 14:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A period of snow fell, which was heavy at times before ending briefly as rain. A report of 5.0 inches of snow was received from Malvern.

Winter Weather in PHILADELPHIA, PENNSYLVANIA
From 22-FEB-21 10:00:00 to 22-FEB-21 13:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow fell across the county, which steadily changed to rain as warmer air moved in. In the northern portion of the county, a report of 3.3 inches of snow was received from Chestnut Hill. Further south, Philadelphia International Airport (KPHL) reported just 0.8 inches of snow. Both KPHL and Northeast Philadelphia Airport (KPNE) reported traces of freezing rain as snow changed to rain.

Winter Weather in DELAWARE, PENNSYLVANIA
From 22-FEB-21 09:45:00 to 22-FEB-21 13:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A period of snow fell, which was heavy at times before changing to rain. A trained spotter in Newtown Square reported 4.0 inches of snow before the changeover, with another spotter report of 4.0 inches in Wayne.