by Mount Holly, NJ – August 1, 2025 – A powerful storm system is set to sweep across Pennsylvania, New Jersey, Delaware, and Maryland on Thursday, bringing intense rainfall and a serious risk of flash flooding across major metro areas. Residents are being urged to prepare for what could be one of the most widespread flood events of the summer.
What to Expect
The National Weather Service in Mount Holly has issued flood advisories and severe thunderstorm warnings for much of the region. Rainfall rates could exceed 2 inches per hour in some locations, with overall totals between 2 and 4 inches. However, certain areas may receive more than 6 inches, increasing the risk of rapid-onset flooding.
Cities under the greatest threat include Philadelphia, Wilmington, Trenton, and Baltimore, all within the Moderate Risk (Level 3 of 4) flood zone. Urban neighborhoods, creeks, and poor drainage areas are especially vulnerable.
Flash Flooding and Dangerous Roads
Flooding is expected to impact major highways and local roads, particularly in low-lying and heavily paved urban centers. High-risk areas include I-95, Route 1, and smaller feeder roads in flood-prone zones. Sudden road closures, submerged vehicles, and severely reduced visibility are likely during peak downpours.
Motorists are strongly advised to avoid travel during the most active storm periods and to never drive through flooded roads.
Wind Damage and Flash Flooding
While isolated wind damage and downed trees may occur, flash flooding remains the primary hazard. Emergency management agencies warn this system could rival or exceed earlier summer storm impacts in terms of water volume and urban disruption.
Safety Precautions
Officials are advising residents to take immediate precautions:
- Secure loose outdoor objects ahead of storms
- Avoid travel if possible, particularly Thursday afternoon and evening
- Monitor weather alerts through reliable local sources
- Prepare emergency kits and backup power options in case of outages
Stay Updated
Weather conditions could shift quickly throughout the day Thursday. Residents across Pennsylvania, New Jersey, Delaware, and Maryland are urged to stay informed and ready as further warnings may be issued with little notice.
