A weak low pressure system that moved through the Gulf Coast States and exited quickly off the North Carolina coast had sufficient moisture and came close enough to eastern Pennsylvania to give the region some heavy snow. Freezing rain and sleet mixed with the snow in and around Philadelphia. Accumulations ranged from 3 to 6 inches in most areas. Snow spread across the region by noon EST on the 19th and fell at a fairly steady rate throughout this event. Precipitation mixed with and changed over to sleet and freezing rain in and around Philadelphia between 6 p.m. and 10 p.m. EST.  Bridges, overpasses and untreated roadways became very treacherous. Specific accumulations included 6.0 inches in Thorndale (Chester County) and Macungie (Lehigh County), 5.7 inches in Saylorsburg (Monroe County), 5.5 inches in Southampton (Bucks County) and Palm (Montgomery County), 5.2 inches in Ambler (Montgomery County), 5.1 inches in Springtown (Bucks County), 5.0 inches in Albrightsville (Carbon County), Chadds Ford (Delaware County), Boyertown (Berks County) and Analomink (Monroe County), 4.8 inches in Bensalem (Bucks County) and Glenmoore (Chester County), 4.7 inches in Reading (Berks County), 4.6 inches in Williams Township (Northampton County), 4.5 inches in Newtown Square (Delaware County), Forks (Northampton County) and Pottstown (Montgomery County), 4.0 inches at the Lehigh Valley and Philadelphia International Airports, in Bechtelsville (Berks County), Fricks (Bucks County), Lehighton (Carbon County) and Pocono Summit (Monroe County), Somerton (Philadelphia County), 3.9 inches in Exton (Chester County) and 3.0 inches in East Stroudsburg (Monroe County) and Honey Brook (Chester County). The low pressure system responsible for the wintry mix developed in the Gulf Coast States during the evening of the 18th. By the morning of the 19th, it was located in northern Mississippi. At 11a.m. EST the primary low moved into Tennessee as a secondary formed near Wilmington, North Carolina. At 5 p.m. EST it moved to just east of Elizabeth City, North Carolina and then accelerated to a position south of Cape Cod at midnight EST on the 20th.

Heavy Snow in LEHIGH, PENNSYLVANIA
From 19-JAN-02 11:00:00 to 20-JAN-02 01:00:00 (EST)
Reported by: TRAINED SPOTTER

Heavy Snow in MONROE, PENNSYLVANIA
From 19-JAN-02 09:00:00 to 19-JAN-02 23:30:00 (EST)
Reported by: TRAINED SPOTTER

Heavy Snow in MONTGOMERY, PENNSYLVANIA
From 19-JAN-02 11:00:00 to 20-JAN-02 00:00:00 (EST)
Reported by: TRAINED SPOTTER

Heavy Snow in BERKS, PENNSYLVANIA
From 19-JAN-02 11:00:00 to 20-JAN-02 00:00:00 (EST)
Reported by: TRAINED SPOTTER

Heavy Snow in CARBON, PENNSYLVANIA
From 19-JAN-02 11:00:00 to 19-JAN-02 23:00:00 (EST)
Reported by: TRAINED SPOTTER

Heavy Snow in NORTHAMPTON, PENNSYLVANIA
From 19-JAN-02 11:00:00 to 20-JAN-02 01:00:00 (EST)
Reported by: TRAINED SPOTTER

Heavy Snow in BUCKS, PENNSYLVANIA
From 19-JAN-02 11:00:00 to 20-JAN-02 01:00:00 (EST)
Reported by: TRAINED SPOTTER

Heavy Snow in CHESTER, PENNSYLVANIA
From 19-JAN-02 10:00:00 to 20-JAN-02 00:00:00 (EST)
Reported by: TRAINED SPOTTER

Winter Storm in DELAWARE, PENNSYLVANIA
From 19-JAN-02 10:00:00 to 20-JAN-02 01:00:00 (EST)
Reported by: TRAINED SPOTTER

Sleet in PHILADELPHIA, PENNSYLVANIA
From 19-JAN-02 10:30:00 to 20-JAN-02 01:00:00 (EST)
Reported by: TRAINED SPOTTER