Philadelphia, Pennsylvania – A late-season winter setup could bring the risk of heavy snow to parts of the Mid-Atlantic during St. Patrick’s Day week, potentially affecting travel and outdoor events just days before the first day of spring.
According to the NOAA Climate Prediction Center’s 8–14 day outlook, the period from March 15 through March 21 favors above-normal precipitation across the Mid-Atlantic, while temperatures trend below seasonal averages across much of the eastern United States. The pattern develops as a strong cold boundary pushes south from Canada, stretching from the Northeast through the Great Lakes and down toward the Southeast.
That setup could allow storm systems moving along the East Coast to tap into colder air, creating a window for heavy snow across parts of eastern Pennsylvania and northern New Jersey if temperatures remain cold enough.
Cities including Philadelphia, Allentown, Trenton, Newark, and surrounding suburbs could see the greatest potential impacts if a coastal system strengthens during the period.
Drivers along major travel corridors including Interstate 95, Interstate 76, Interstate 78, and the New Jersey Turnpike should monitor conditions closely if storms begin organizing. Heavy snow can quickly reduce visibility and create hazardous travel conditions, especially during morning and evening commutes.
The timing is notable as daylight saving time begins this weekend, yet winterlike conditions could still reach the Mid-Atlantic even as the first day of spring arrives later that week.
Forecasters will refine storm timing and track over the coming days, and winter weather advisories or watches could be issued if the colder pattern aligns with developing coastal storms.
