The National Weather Service National Tsunami Warning Center (NTWC) in Palmer, Alaska has just issued a Tsunami Advisory for the entire U.S. West Coast, British Columbia, Canada, and for most of the Alaska coast. A massive explosive eruption of a volcano in the Tonga Islands has triggered a tsunami threat across the Pacific Ocean.
According to the NTWC, actions to protect human life and property will vary within tsunami advisory areas. They advise that if you’re in a Tsunami Advisory area, you should immediately:
• *Move out of the water, off the beach, and away from harbors, marinas, breakwaters, bays and inlets.
• *Be alert to and follow instructions from your local emergency officials because they may have more detailed or specific information for your location.
• *Boat operators, where time and conditions permit, move your boat out to sea to a depth of at least 180 feet.
• *Boat operators, if at sea, avoid entering shallow water, harbors, marinas, bays, and inlets to avoid floating and submerged debris and strong currents.
• *Do not go to the shore to observe the tsunami.
• *Do not return to the coast until local emergency officials indicate it is safe to do so.
The NTWC says many things are possible within the Tsunami Advisory area:
• *A tsunami with strong waves and currents is possible.
• * Waves and currents can drown or injure people who are in the water.
• * Currents at beaches and in harbors, marinas, bays, and inlets may be especially dangerous.
• * Some impacts may continue for many hours to days after arrival of the first wave.
• * The first wave may not be the largest so later waves may be larger.
• * Each wave may last 5 to 45 minutes as a wave encroaches and recedes.
• * Coasts facing all directions are threatened because the waves can wrap around islands and headlands and into bays.
• * A rapidly receding or receded shoreline, unusual waves and sounds, and strong currents are signs of a tsunami.
• * 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.
This tsunami activity is being triggered by a violent, explosive volcanic event that unfolded last night in Tonga. The gigantic blast, which occured in the Pacific Ocean about 1,300 miles northeast of New Zealand and 2,000 miles southwest of Hawaii, was so loud its roar was heard across portions of New Zealand. Fiji, which is located more than 500 miles away, reported “loud thunder sounds” as the explosive volcanic eruption unfolded.
The volcanic eruption hit at roughly 5:27 pm local time. The volcano is located 40 miles south of the capital city of Tonga, Nuku’alofa.

#Tsunami
#US
#West Coast






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