Portsmouth, NH – A tsunami alert along New Hampshire’s short but vulnerable coastline is rare, but fast-moving water can flood low-lying areas within minutes, especially near Hampton Beach and Portsmouth Harbor.
According to the National Weather Service and NOAA, a Tsunami Warning means dangerous coastal flooding and strong currents are expected or already occurring. Residents in Portsmouth, Hampton, and Seabrook should move inland immediately. Avoid low-lying routes such as Ocean Boulevard and coastal sections of Route 1A, which can flood quickly or become congested during evacuations.
A Tsunami Advisory signals strong currents and hazardous waves. While not a full evacuation, conditions near beaches, harbors, and tidal inlets can become life-threatening. Stay out of the water and away from docks, marinas, and shoreline areas.
A Tsunami Watch means a tsunami is possible following a distant earthquake. Residents should review evacuation routes, prepare emergency supplies, and stay alert for updates.
An Information Statement indicates no immediate threat.
New Hampshire’s limited coastline still faces risk from surges moving into Great Bay and connected waterways. Residents should enable emergency alerts, monitor local officials, and be ready to move inland immediately if a warning is issued.
