Weather
Mid-Atlantic Weather Alert: 3 Inches of Rain, Flooding Possible Sunday Oct 11th
Philadelphia, PA – Millions of residents across southeastern Pennsylvania, southern New Jersey and Delaware face a potentially disruptive weather pattern Sunday, October 11, as heavy rainfall, isolate
By Caleb Mercer · 2026-10-10T13:11:24.485Z
Philadelphia, PA – Millions of residents across southeastern Pennsylvania, southern New Jersey and Delaware face a potentially disruptive weather pattern Sunday, October 11, as heavy rainfall, isolated severe thunderstorms and coastal flooding threats develop across the region.
According to the National Weather Service in Philadelphia/Mount Holly, rainfall totals of 1 to 2 inches are expected Sunday into Sunday night, with locally higher amounts reaching 3 inches possible.
Forecasters have placed portions of the region under a Level 1 of 4 marginal excessive rainfall risk, meaning isolated flash flooding could develop, particularly in urban neighborhoods and areas with poor drainage.
Philadelphia, Wilmington, Trenton, Atlantic City and surrounding communities could experience periods of heavy rain, with roadway ponding and localized travel disruptions possible.
The severe weather outlook also identifies a Level 1 of 5 marginal risk for portions of southern New Jersey and Delaware, primarily south of the Philadelphia metropolitan area.
Isolated severe thunderstorms could develop Sunday afternoon and evening, with locally damaging wind gusts and an isolated tornado identified as the primary concerns.
Along Delaware Bay, another concern emerges during Sunday's and Monday's high tides.
The National Weather Service warns that minor tidal flooding could affect vulnerable coastal roads and traditionally flood prone communities, including areas near Cape May, Cumberland County and Delaware's bay shoreline.
Saturday offers a quieter period before conditions deteriorate, with dry weather, increasing clouds and afternoon temperatures generally ranging from the mid 60s to lower 70s.
Residents should prepare for changing travel conditions, avoid driving through flooded roadways and ensure weather alerts are enabled on mobile devices.
While widespread river flooding is not currently forecast, localized flash flooding remains possible where heavier rainfall develops.