Flooding
The most common and costly hazard in Pennsylvania. Heavy rains, snowmelt, and ice jams cause severe riverine and flash flooding across all counties.
Northeast preparedness
Pennsylvania Emergency Preparedness & Hazard Guide
Pennsylvania's diverse geography makes it vulnerable to a wide range of natural hazards, with flooding and winter storms leading as the most frequent threats. Preparedness requires an understanding of localized risks from the Great Lakes region to the Atlantic coastal impacts.
Preparedness overview
With topography that includes the Appalachian Mountains, large river valleys, and significant urban centers, Pennsylvania experiences complex weather patterns. Flooding is the state's most frequent and costly natural hazard, affecting both urban and rural areas through flash floods, riverine flooding, and ice jams. Additionally, winter brings heavy snow, ice storms, and dangerous snow squalls, especially in the western and central parts of the state. Severe thunderstorms, tornadoes, and the remnants of tropical systems from the Atlantic also pose significant annual risks. A resilient Pennsylvania household plans for severe weather disruptions, long-duration power outages, and sudden travel impacts.
Pennsylvania
Common hazards to plan around
Winter Storms & Snow Squalls
Heavy snowfall, ice storms, and sudden white-out snow squalls create dangerous travel conditions, power outages, and isolated communities.
Severe Thunderstorms & Tornadoes
Spring and summer months bring strong storms capable of producing damaging winds, large hail, and tornadoes, particularly in the central and eastern regions.
Tropical Storm Remnants
Hurricanes and tropical storms moving up the East Coast frequently dump massive amounts of rainfall inland, leading to catastrophic regional flooding.
Extreme Heat
Summer heat waves with high humidity levels pose significant health risks, especially to vulnerable populations in dense urban centers like Philadelphia and Pittsburgh.
Power Outages
High winds, ice accumulation, and severe weather often result in utility disruptions, requiring residents to be self-sufficient for several days.
Preparedness priorities
- Build an emergency supply kit with at least three days of food, water, and essential medications.
- Develop and practice a family communications plan to ensure everyone knows how to connect during a disaster.
- Sign up for local alerts and monitor weather forecasts to receive timely warnings for severe storms or floods.
- Winterize your home by insulating pipes, clearing gutters, and ensuring alternative heating sources are safe to use.
- Review your insurance policies, noting that standard homeowner insurance does not cover flood damage.
- Keep your vehicle's gas tank at least half full and pack a winter emergency kit in your car.
Official sources
- Pennsylvania Emergency Management Agency (PEMA)
The primary state agency coordinating disaster mitigation, preparedness, response, and recovery.
- Ready PA
Pennsylvania's official emergency preparedness campaign for individuals, families, and communities.
- 511PA Travel Info
Real-time traffic, weather-related road closures, and travel conditions managed by PennDOT.
- Pennsylvania Department of Health
Official guidance on public health emergencies, extreme heat safety, and community health.
- National Weather Service
Provides local weather forecasts, severe weather watches, and warnings.
- America250Atlas - Pennsylvania
Educational state history profile for Pennsylvania from America250Atlas, a visual guide for the United States 250th anniversary.
Morgan Hale
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