Philadelphia is starting Thursday in the low 70s with humid air and a light breeze, but the calm opening is expected to give way to a much rougher afternoon. Showers and thunderstorms are likely to build after late morning, with the heaviest activity arriving during the afternoon and evening. A Flood Watch is in effect across the city as forecasters warn of flash flooding, damaging winds and a few possible tornadoes.
Flood Watch Covers Philadelphia Through Late Tonight
The watch runs from noon Thursday through 2 a.m. Friday. According to the National Weather Service Mount Holly, multiple rounds of rain could drop 1 to 2 inches, with isolated totals of 3 to 5 inches; the heaviest downpours may produce 1 to 3 inches per hour. Urban streets, poor-drainage areas, creeks and low-lying roads are the main concerns.
Storms Strengthen During The Afternoon
A stray shower is possible around late morning, but rain chances climb quickly after noon. Temperatures should peak near 83 before sliding into the upper 70s as storms move through, while winds remain mostly light but can turn gusty and erratic near thunderstorms. The strongest window currently looks to be midafternoon through early evening.
Evening Commute Could Get Messy
That timing could make Thursday’s evening commute a slog, especially if storms repeatedly cross the same neighborhoods. Heavy rain may overwhelm drains, pond on roads and reduce visibility, while lightning adds another reason to postpone outdoor plans. Showers and storms may linger into Thursday night before fading before 1 a.m. Friday.
Friday Calms Down, Weekend Stays Unsettled
Friday should be partly sunny and cooler, with a high near 80 and only a small daytime rain chance. Storm chances return Friday night, and showers and thunderstorms are likely Saturday, when another half-inch to three-quarters of an inch could fall. Sunday brings a warmer 84-degree high and a 40% chance of storms after 2 p.m.
A quieter stretch finally arrives Monday and Tuesday, with sunny skies and highs around 81 to 82. Another afternoon storm chance may return Wednesday, but Thursday’s downpours are the immediate concern for drivers, commuters and anyone with outdoor plans.
What Philly Residents Should Know
Do not drive through water-covered roads, and keep a phone nearby for Flash Flood Warnings. If thunder roars, move indoors; people near creeks, streams and known low spots should be ready to move to higher ground if warnings are issued. Outdoor events and travel plans should have an indoor backup Thursday afternoon and evening.
