As tsunami alerts spread across the Pacific following the massive earthquake near Russia’s Kamchatka Peninsula, here's a quick look at what each alert level issued by the US National Weather Service actually means.
The agency uses a four-tier tsunami alert system:
Tsunami warning: Issued when there is a threat of dangerous coastal flooding and powerful currents. People in affected areas are urged to move to higher ground or head inland immediately.
Tsunami advisory: Indicates the possibility of strong currents and waves that are hazardous for those in or near the water. Residents should stay away from beaches, harbors, and waterways.
Tsunami watch: A tsunami may occur, often from a distant source. The situation is monitored, and people should stay alert and be ready to act quickly if upgraded.
Tsunami information statement: No current threat. Issued for very distant events or when there is no significant risk to the public.
