A protracted winter storm affected the Poconos from around Midnight on the 23rd into the early morning on the 24th and brought two shots of wintry weather during the early morning and overnight on the 23rd. Snow accumulations averaged 3 to 10 inches in the Poconos, 2 to 6 inches in the Lehigh Valley and 1 to 3 inches in upper Bucks County. Ice accretions averaged a tenth of an inch or less, greatest in the Lehigh Valley. Over the higher terrain of the Poconos, precipitation started as snow around Midnight EDT on the 23rd and fell at its heaviest during the event during the pre-dawn hours as a band of heavier snow affected northeastern Carbon County and most of Monroe County. Precipitation briefly changed to freezing rain during the morning of the 23rd before changing back to snow by Noon EDT on the 23rd. Intermittent light snow fell during the afternoon of the 23rd and a steadier snow fell overnight on the 23rd. In the Lehigh Valley, upper Bucks County and the valleys of the Poconos, precipitation started as rain around Midnight EDT on the 23rd and changed to snow shortly thereafter. The snow changed to rain around 8 a.m. EDT on the 23rd and occasional rain fell through the evening. As colder air moved in near the surface, the rain changed to freezing rain around Midnight EDT on the 24th and continued until precipitation ended around 4 a.m. EDT on the 24th.
Untreated roadways were treacherous, especially during the early morning on the 23rd when the heavier snow was falling in the Poconos.  Most schools in the Poconos were closed on the 23rd and most schools in the northern part of the Lehigh Valley had delayed openings on the 23rd.
Representative snowfall included 11.0 inches in Pocono Summit (Monroe County), 10.2 inches in Bossardsville (Monroe County), 9.1 inches in Tobyhanna (Monroe County), 8.8 inches in Stroudsburg (Monroe County), 8.5 inches in Kidder Township (Carbon County), 5.5 inches in Williams Township (Northampton County), 4.0 inches in Beltzville and Summit Hill (both Carbon County), 3.5 inches in Coaldale (Carbon County), 3.2 inches in Bethlehem (Northampton County) 3.0 in Bowmanstown (Carbon County) and Nazareth (Northampton County), 2.9 inches in Springtown (Bucks County) and Lehighton (Carbon County),  2.8 inches in Martins Creek (Northampton County), 2.6 inches at the Lehigh Valley International Airport, 2.5 inches in Schnecksville (Lehigh County) and 2.0 inches in Emmaus (Lehigh County).
The wintry weather was caused by a pair of low pressure systems that moved from Iowa on the evening of the 22nd east and reached the central Ohio Valley on the morning of the 23rd, near Pittsburgh Pennsylvania during the afternoon of the 23rd and passed off the Delmarva and Virginia coasts overnight on the 23rd.

Winter Weather in BUCKS, PENNSYLVANIA
From 23-MAR-11 22:00:00 to 24-MAR-11 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 24-MAR-11 00:00:00 to 24-MAR-11 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Storm in MONROE, PENNSYLVANIA
From 22-MAR-11 23:00:00 to 24-MAR-11 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 23-MAR-11 00:00:00 to 23-MAR-11 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in NORTHAMPTON, PENNSYLVANIA
From 23-MAR-11 00:00:00 to 23-MAR-11 08:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in CARBON, PENNSYLVANIA
From 22-MAR-11 23:00:00 to 24-MAR-11 04:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Winter Weather in LEHIGH, PENNSYLVANIA
From 24-MAR-11 00:00:00 to 24-MAR-11 03:00:00 (EST-5)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter