Philadelphia, Pennsylvania – The risk of a winter storm impacting the Philadelphia metro area is increasing, as forecasters highlight a strengthening system that could bring accumulating snow and hazardous travel conditions this weekend, according to the NOAA Weather Prediction Center.
The outlook covers 7 p.m. Friday through 7 p.m. Monday, a window during which a developing storm system may affect the Interstate 95 corridor, including Philadelphia, southeastern Pennsylvania, and adjacent parts of New Jersey and Delaware.
As of Monday evening, the Philadelphia area is now included in a 20% probability zone for at least moderate winter storm impacts, with forecasters noting that probabilities are trending upward as confidence in the overall pattern improves. Officials caution that specific snowfall amounts and timing remain uncertain.
What forecasters know:
- Very cold Arctic air will remain entrenched across the Mid-Atlantic, ensuring any precipitation falls as snow, even in urban and coastal areas.
- A high-altitude disturbance is forecast to dive out of Canada on Thursday, then deepen across the eastern U.S. by Saturday.
- This evolution is expected to generate a surface low-pressure system, which could track close enough to impact southeastern Pennsylvania.
- Small shifts in storm track could significantly change snowfall outcomes along I-95, including Center City, South Philly, and the surrounding suburbs.
What remains uncertain:
- The exact track of the surface low
- Whether the heaviest snow sets up north of Philadelphia, directly over the metro, or shifts offshore
- The duration and intensity of snowfall during the Friday–Monday period
With temperatures expected to remain below freezing throughout the event window, even moderate snowfall could lead to prolonged icy roads, reduced visibility, and SEPTA travel disruptions, especially during overnight and early-morning hours.
Residents are urged to monitor forecast updates closely through midweek, particularly those planning weekend travel or events, as probabilities may continue to rise if forecast confidence increases.
