Tsunami advisory in effect for U.S. West Coast after volcanic eruption

Warnings have also been issued for the island nation, New Zealand’s North island and Canada’s British Columbia.

The eruption was so large it could be seen from space

An advisory was also issued for Hawaii. “A tsunami is currently being observed by all Islands’ Emergency Management,” the Pacific Tsunami Warning Center tweeted. “We are relieved that there is no reported damage and only minor flooding through-out the islands.”

Tsunami activity was expected to start at 6 a.m. local time in Alaska. California’s Fort Bragg was forecast to see it start at 7:35, with the Bay Area seeing activity later, at 8:10 a.m. In Washington, waves were predicted to hit Long Beach at 8:35 a.m., followed by other areas in the state later in the morning.     

Later waves may be larger than any initial wave, and “each wave may last 5 to 45 minutes as a wave encroaches and recedes,” according to the warning center.  

Signs of a tsunami include strong currents, a shoreline that has receded or is receding quickly, and unusual waves and sounds. “The tsunami may appear as water moving rapidly out to sea, a gentle rising tide like flood with no breaking wave, as a series of breaking waves, or a frothy wall of water,” the National Tsunami Warning Center said. 

An advisory is in effect for Alaska’s entire coastline, and any waves that hit the state are primarily forecast to impact coastlines that are south-facing.

It said its weather stations had observed “a pressure surge” Saturday evening, following the eruption.

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