Weak low pressure passed offshore of the mid-Atlantic on February 18. Another weak, secondary wave of low pressure tracked along a similar path along a frontal zone trailing behind the primary low on the 19th. Strong high pressure over New England provided a cold air mass over the mid-Atlantic, leading to wintry precipitation as these areas of low pressure tracked offshore. The heaviest precipitation occurred with the primary wave on the 18th, with many areas seeing snow, some locally heavy, with a change to sleet and rain towards coastal areas. A narrow but intense band of precipitation provided a maximum in snowfall over portions of southeast Pennsylvania and central New Jersey. By the overnight of the 18th and into the 19th, precipitation became lighter, with a mix of light snow and light freezing rain or drizzle providing some additional accumulations and impacts. The system finally pulled away entirely by the late afternoon and evening of the 19th.

Winter Weather in MONROE, PENNSYLVANIA
From 18-FEB-21 08:30:00 to 19-FEB-21 15:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow fell across the county, with an initial round of snow on the 18th, followed by a lull and some light freezing drizzle on the overnight of the 18th, then additional light snow on the 19th. Over the course of the event, a maximum storm total snowfall report of 5.8 inches was received from near Bossardsville. Several other 4 to 5 inch reports were received. The Mount Pocono (KMPO) ASOS recorded 0.04 inches of ice accretion from the freezing drizzle on the night of the 18th.

Winter Weather in CARBON, PENNSYLVANIA
From 18-FEB-21 06:30:00 to 19-FEB-21 15:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Light snow fell across the county on the 18th. A lull in precipitation occurred on the overnight of the 18th, though some patchy light freezing rain or drizzle may have occurred. Additional light snow then fell on the 19th. A broadcast media source reported a maximum storm total snowfall of 5.3 inches in Summit Hill.

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 18-FEB-21 06:30:00 to 19-FEB-21 16:15:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wintry mixed precipitation fell across the county. This began with a period of snow during the day on the 18th, followed by light freezing rain and drizzle that night, then some additional light snow on the 19th. A trained spotter in Bath reported a storm total snowfall of 6.0 inches, with several other 4 to 5 inch reports. A trained spotter in Hellertown also reported 0.10 inches of ice accretion.

Winter Storm in LEHIGH, PENNSYLVANIA
From 18-FEB-21 06:30:00 to 19-FEB-21 16:15:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wintry mixed precipitation fell across the county. Snow fell during the day on the 18th, followed by freezing rain and drizzle overnight then additional light snow on the 19th. A trained spotter in Whitehall Twp reported a storm total snowfall of 6.2 inches, with another spotter in Coopersburg reporting 6.1 inches. The Lehigh Valley International Airport (KABE) saw 5.5 inches of snow and the ASOS measured 0.13 inches of ice accretion.

Winter Storm in BERKS, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 15:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wintry mixed precipitation fell across the county. Snow fell on the 18th, followed by light freezing rain and drizzle that night, and some additional light snow on the 19th. A trained spotter in Huffs Church reported a storm total snowfall of 5.8 inches. The Reading Regional Aiport (KRDG) ASOS measured 0.09 inches of ice accretion.

Winter Storm in UPPER BUCKS, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 17:15:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow fell and was heavy at times on the morning of the 18th as the northern extent of a heavy snow band affected the area. As snow departed, some light freezing rain and drizzle occurred on the overnight of the 18th, with a small amount of additional snow on the 19th. A trained spotter in Chalfont reported 5.4 inches of snow. Numerous observations from surrounding areas suggest around one tenth of an inch of glaze ice accretion likely occurred on the overnight of the 18th.

Winter Storm in LOWER BUCKS, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 18:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow began on the morning of 18th and fell heavily for a few hours. Snow tapered off later in the day, but light freezing rain and drizzle continued into the overnight. Additional light snow then fell on the 19th. A maximum storm total snowfall of 9.8 inches was reported in Fairless Hills. Several other 6 to 9 inch reports were received. The Doylestown Airport (KDYL) ASOS reported 0.19 inches of ice accretion.

Winter Storm in WESTERN MONTGOMERY, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 17:15:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow fell across the area on the morning of the 18th. Light freezing rain and drizzle then fell on the overnight of the 18th, with additional light snow on the 19th. A trained spotter in Royersford reported a storm total snowfall of 5.6 inches. The Pottstown (KPTW) ASOS reported 0.15 inches of ice accretion.

Winter Storm in EASTERN MONTGOMERY, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 17:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A heavy snow band centered itself over eastern Montgomery County on the morning of the 18th, with snowfall rates over one inch per hour for several hours. Precipitation decreased in intensity and changed to light freezing rain and drizzle by the overnight of the 18th, with a bit of additional light snow on the 19th. A COOP observer in West Conshohocken reported a storm total snowfall of 10.8 inches, with numerous other 6 to 10 inch reports in the area. A trained spotter in Willow Grove reported 0.02 inches of ice accretion, and some higher ice amounts may have occurred.

Winter Storm in WESTERN CHESTER, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 16:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy snow fell on the morning of the 18th as a band of snow with rates over an inch per hour affected the area. Precipitation decreased in intensity and changed to freezing rain and drizzle on the overnight of the 18th, before some additional light snow fell on the 19th. A maximum storm total snowfall report of 10.1 inches was received from Phoenixville. A trained spotter in Oxford reported 0.01 inches of ice accretion.

Winter Storm in EASTERN CHESTER, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 17:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy snow fell on the morning of the 18th as a band of snow with rates in excess of an inch per hour affected the area for several hours. Precipitation decreased in intensity and turned to light freezing rain and drizzle on the overnight of the 18th, before additional light snow fell on the 19th. A maximum storm total snowfall report of 10.2 inches was received from Malvern, with several other 6 to 9 inch reports. Trained spotters in both West Chester and near Exton reported 0.10 inches of ice accretion.

Winter Storm in PHILADELPHIA, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 18:30:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Snow fell across the county on the morning of the 18th. The county was on the southern edge of a band of high snowfall rates, with sharp gradients observed across the small county. Freezing rain and drizzle then fell on the overnight of the 18th, with additional light snow on the 19th. In Chestnut Hill, which saw the effects of the heavy snow band, a storm total snowfall of 8.8 inches was reported. At the southern edge of the county, Philadelphia International Airport (KPHL) saw just 3.4 inches. Freezing rain was also a significant factor, with Northeast Philadelphia Airport (KPNE) seeing 0.28 inches of ice accretion, and KPHL seeing 0.18 inches.

Winter Storm in DELAWARE, PENNSYLVANIA
From 18-FEB-21 05:00:00 to 19-FEB-21 17:45:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Snow fell across the county on the morning of the 18th. The northern portion of the county was impacted by an intense snow band with snowfall rates in excess of one inch per hour for several hours. Light freezing rain and drizzle fell on the overnight of the 18th, with a small amount of additional snow on the 19th. A trained spotter in Wayne, at the far northern extent of the county, reported 11.0 inches of snow. Other portions of the county reported less than 5 inches of snow. A trained spotter in Thornton also reported 0.10 inches of ice accretion.