wweather1
wweather1 wweather1
HomeWeather news → Flood Watch Issued for Parts of New Jersey, Delaware, and Pennsylvania
🌊 Flood United States

Flood Watch Issued for Parts of New Jersey, Delaware, and Pennsylvania

September 12, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Mount Holly, New Jersey, has issued a Flood Watch for multiple counties across Delaware, New Jersey, and Pennsylvania due to the threat of excessive rainfall.

The Flood Watch is in effect from late tonight through Sunday morning, September 13, at 12:00 PM EDT. The alert covers portions of northern Delaware, southeast Pennsylvania, and several areas in New Jersey.

In Delaware, the affected area includes New Castle County. Impacted areas in New Jersey include Camden, Coastal Ocean, Eastern Monmouth, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Northwestern Burlington, Ocean, Salem, Somerset, Southeastern Burlington, and Western Monmouth counties. In southeast Pennsylvania, the watch includes Delaware, Eastern Montgomery, Lower Bucks, Philadelphia, Upper Bucks, and Western Montgomery counties.

Showers and thunderstorms are expected to develop this evening, becoming more widespread late tonight and into Sunday morning. Strongest storms could produce heavy rainfall ranging from 1 to 2 inches in a short window of time.

Excessive runoff from the heavy rainfall may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.

Why it is dangerous and what to do

⚠️ Safety
• Monitor later forecasts for updates.
• Be alert for possible Flood Warnings.
• Be prepared to take action if flooding develops, especially if living in a flood-prone area.
📊 The numbers, from wweather1 data
Philadelphia: now +17°, Clear.
That is 3° above the September climate norm.
The record for this date is +33° (1961).
Three-day forecast: 12 September: +28°/+16° · 13 September: +27°/+21° · 14 September: +25°/+18°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.

🌍 Weather in nearby cities

📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

Other weather news