Tsunami Warning in Hawaii

This alert expired on Oct 28, 2012 2:22 AM HST
National Weather Service
Alert area: Big Island North and East; Kahoolawe; Kauai Leeward; Kauai Windward; Kohala; Kona; Lanai Makai; Leeward Haleakala; Maui Central Valley; Maui Leeward West; Maui Windward West; Molokai Leeward; Molokai Windward; Niihau; Oahu Koolau; Oahu North Shore; Oahu South Shore; Olomana; South Big Island; Waianae Coast; Windward Haleakala

Posted Oct 28, 2012 12:16 AM HST

To - Civil Defense in the state of Hawaii subject - Tsunami Warning supplement a Tsunami Warning continues in effect for the state of Hawaii. An earthquake has occurred with these preliminary parameters origin Time - 0504 pm Hst 27 Oct 2012 Coordinates - 52.8 North 131.8 West Location - Queen Charlotte Islands region magnitude - 7.7 moment measurements or reports of tsunami wave activity reports of 4ft oscillations continuing at Wailoa Harbor near Hilo on the Big Island gauge location Lat Lon Time Ampl per ------------------- ----- ------ ----- --------------- ----- Honolulu Oahu 21.3N 157.9W 0903z 0.15M / 0.5FT 12min Mokuoloe oahu 21.4N 157.8W 0858z 0.08M / 0.2FT 08min Midway 28.2N 177.4W 0923z 0.09M / 0.3FT 10min Hilo Hawaii 19.7N 155.1W 0853z 0.37M / 1.2FT 16min Kawaihae Hawaii 20.0N 155.8W 0931z 0.43M / 1.4FT 08min Kahului Maui 20.9N 156.5W 0907z 0.76M / 2.5FT 12min Waianae HI 21.4N 158.2W 0855z 0.16M / 0.6FT 06min Haleiwa HI 21.6N 158.1W 0844z 0.43M / 1.4FT 10min Hanalei HI 22.2N 159.5W 0843z 0.17M / 0.6FT 22min Makapu`u HI 21.3N 157.7W 0849z 0.41M / 1.3FT 08min dart 46410 57.6N 143.8W 0428z 0.03M / 0.1FT 32min dart 46409 55.3N 148.5W 0444z 0.02M / 0.1FT 38min dart 46403 52.7N 156.9W 0528z 0.02M / 0.1FT 26min dart 46402 51.1N 164.0W 0609z 0.02M / 0.1FT 24min dart 46404 45.9N 128.8W 0423z 0.05M / 0.1FT 30min dart 46407 42.6N 128.9W 0456z 0.07M / 0.2FT 28min Sitka AK 57.1N 135.3W 0542z 0.09M / 0.3FT 30min Crescent City CA 41.7N 124.2W 0736z 0.42M / 1.4FT 24min dart 46419 48.8N 129.6W 0344z 0.07M / 0.2FT 20min Arena Cove CA 38.9N 123.7W 0633z 0.32M / 1.1FT 06min Winter Harbour bc 50.5N 128.0W 0413z 0.23M / 0.8FT 30min Langara Point bc 54.2N 133.1W 0424z 0.20M / 0.7FT 26min Lat - latitude (N-north, S-south) Lon - Longitude (E-east, W-west) time - time of the measurement (Z is Utc is Greenwich Time) Ampl - Tsunami amplitude measured relative to normal sea level. It is not. Crest-to-trough wave height.

Values are given in both METERS(M) and FEET(ft).

Per - period of time in MINUTES(Min) from one wave to the next. Note - dart measurements are from the deep ocean and they are generally much smaller than would be coastal measurements at similar locations.

Evaluation a tsunami has been generated that could cause damage along coastlines of all islands in the state of Hawaii. Urgent action should be taken to protect lives and property.

A tsunami is a series of long ocean waves. Each individual wave Crest can last 5 to 15 minutes or more and extensively flood coastal areas. The danger can continue for many hours after the initial wave as subsequent waves arrive. Tsunami wave heights cannot be predicted and the first wave may not be the largest. Tsunami waves efficiently wrap around islands. All shores are at risk no matter which direction they face. The trough of a tsunami wave may temporarily expose the seafloor but the area will quickly flood again. Extremely strong and unusual nearshore currents can accompany a tsunami. Debris picked up and carried by a tsunami Amplifies Its destructive power. Simultaneous high tides or high surf can significantly increase the tsunami hazard. The estimated arrival time in Hawaii Of The First tsunami wave is 10:28 pm Hst Sat 27 Oct 2012 messages will be issued hourly or sooner as conditions warrant.

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