Northumberland County in central Pennsylvania at the confluence of the North and West branches of the Susquehanna River faces serious flooding risk. The Susquehanna has repeatedly flooded Sunbury and surrounding communities. Ida in 2021 caused significant flooding. The county is within the 50-mile ingestion zone of Three Mile Island Nuclear Station. The Susquehanna River confluence creates complex flood dynamics during major rainfall events.
// Preparedness Recommendations
- Evacuation routes inland should be identified in advance.
- Store at least 72 hours of food and water.
- Elevate critical belongings above flood level.
- Have backup power ready in case of grid failure.
// Recommended Supplies
Essential gear for power outages, severe weather, and emergency situations in your area.
- Emergency Food Supplies
- Water Filtration & Storage
- Backup Generator
- Solar Backup Power
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// Risk Intelligence
| Threat Score | 5 / 10 Moderate Risk |
| Primary Hazard | Flash Flooding / Tornado |
| Secondary Hazard | Nuclear Proximity |
| FEMA Flood Zone | Moderate |
| Federally Declared Disasters | 6 |
| Last Major Event | Ida 2021 |
| Event Frequency | Annual |
// Emergency Operations
| Emergency Mgmt Phone | (570) 988-4100 |
| Emergency Shelters | 4 designated facilities |
| Evacuation Routes | I-80 US-11 PA-147 PA-54 |
// County Profile
| County | Northumberland County PA |
| State | Pennsylvania (PA) |
| Population | 90 |
| Area | 458 sq miles |
| FEMA Region | Moderate |
// Other Pennsylvania Counties
Luzerne County PA
Flash Flooding / Hurricane
7/10
High
Philadelphia County PA
Hurricane / Flooding
6/10
Moderate
Allegheny County PA
Flash Flooding / Tornado
6/10
Moderate
Montgomery County PA
Tornado / Flash Flooding
6/10
Moderate
Cameron County PA
Flash Flooding / Winter Storm
5/10
Low
Armstrong County PA
Flash Flooding / Winter Storm
5/10
Low