Weather
Mid-Atlantic Flood Risk Today: Up to 5 Inches of Rain Possible Oct 11
Philadelphia, PA – Heavy rainfall continues across portions of the Mid Atlantic on Sunday, October 11, with some locations potentially receiving combined storm totals approaching 5 inches before condi
By Mara Ellison · 2026-10-11T18:35:17.437Z
Philadelphia, PA – Heavy rainfall continues across portions of the Mid Atlantic on Sunday, October 11, with some locations potentially receiving combined storm totals approaching 5 inches before conditions improve Monday. Forecasters say widespread river flooding is not expected, although isolated minor flooding remains possible.
According to the National Weather Service Middle Atlantic River Forecast Center, rainfall associated with the remnants of Hurricane Isaias will continue through Sunday night before gradually tapering off overnight into Monday, October 12.
The agency reports that approximately 2–3 inches of rain have already fallen in affected areas, with an additional 1–2 inches possible before the system moves away.
That could bring localized storm totals to approximately 3–5 inches where the heaviest rainfall overlaps.
Virginia, Pennsylvania and New Jersey Under Monitoring
The National Weather Service identifies river basins across Virginia, eastern Pennsylvania and New Jersey as areas being monitored for potential hydrological impacts.
Despite the substantial rainfall, forecasters currently expect most rivers to remain below flood stage.
However, isolated minor river flooding cannot be completely ruled out, particularly where additional rainfall affects already saturated watersheds.
The agency's river forecast map shows numerous monitoring locations across the region, with most indicating normal conditions and several showing elevated water levels.
Rain Expected to Ease Monday
Rainfall should gradually diminish Sunday night, with improving conditions expected Monday as the remnants of the tropical system move away.
Residents traveling through affected areas should remain cautious of water covered roads, reduced visibility and localized drainage problems.
Low lying locations and areas near smaller waterways may be particularly vulnerable where rainfall accumulates quickly.
What Residents Should Know
Drivers should never attempt to cross flooded roadways, even when water appears shallow.
Residents near streams and rivers should monitor changing water levels and follow any official flood advisories issued for their communities.
The National Weather Service will continue monitoring river conditions as rainfall tapers off through Monday, October 12.