Philadelphia, Pennsylvania – A fast-moving line of severe thunderstorms could disrupt travel and knock out power across eastern Pennsylvania and Maryland between 4 p.m. and 10 p.m. Sunday, with damaging wind gusts and isolated tornadoes possible during the evening commute.
According to the National Weather Service in Philadelphia and the Storm Prediction Center, a slight risk (Level 2 of 5) covers much of eastern Pennsylvania, including Philadelphia, Allentown, and Reading, along with northern Delaware and parts of Maryland. A broader marginal risk extends across the Mid-Atlantic, including Baltimore and Washington, D.C. The main threats include wind gusts over 60 mph and hail that could exceed 1 inch in diameter.
Storms are expected to develop and intensify late Sunday afternoon, tracking east into the I-95 corridor. The highest impact window centers on 4 p.m. to 10 p.m., when instability and wind shear may briefly support isolated tornado development.
Localized flooding is also possible, especially in urban areas where heavy downpours could overwhelm drainage systems. Cities including Wilmington, Trenton, and Princeton may see rapid ponding on roads during heavier bursts.
Residents should secure loose outdoor items, charge devices ahead of potential outages, and remain weather-aware through the evening. Additional warnings, including severe thunderstorm or tornado alerts, may be issued with little lead time as storms strengthen.
