To: U.S. West Coast, Alaska, and British Columbia coastal regions
From: NOAA/NWS/West Coast and Alaska Tsunami Warning Center
Subject: Tsunami Advisory #24 issued 03/11/2011 at 8:54PM PST

Advisory canceled from Cascade Head Oregon to Douglas Lane County Line Oregon.

The Tsunami Advisory continues in effect for the coastal areas of California and Oregon from Alamitos Bay, California (20 miles SE of L.A.) to Douglas/Lane County Line, Oregon (10 miles SW of Florence).

The Tsunami Advisory continues in effect for the coastal areas of Alaska from Chignik Bay, Alaska to Attu, Alaska.

This message is for Information Only for coastal areas of California from the California-Mexico border to Alamitos Bay, California (20 miles SE of L.A.).

The Tsunami Advisory is canceled for the coastal areas from Douglas/Lane County Line, Oregon (10 miles SW of Florence) to Cascade Head, Oregon (70 miles SW of Portland).

This message is for Information Only for coastal areas of Oregon, Washington, British Columbia and Alaska from Cascade Head, Oregon (70 miles SW of Portland) to Chignik Bay, Alaska.

A Tsunami Advisory means that a tsunami capable of producing strong currents or waves dangerous to persons in or very near the water is expected. Significant, widespread inundation is not expected for areas under an advisory. Currents may be hazardous to swimmers, boats, and coastal structures and may continue for several hours after the initial wave arrival.

At 9:46 PM Pacific Standard Time on March 10, an earthquake with preliminary magnitude 8.9 occurred near the east coast of Honshu, Japan . (Refer to the United States Geological Survey for official earthquake parameters.) This earthquake has generated a tsunami which could cause damage to coastal regions in a warning or advisory. Estimated tsunami arrival times and maps along with safety rules and other information can be found on the WCATWC web site.

Measurements or reports of tsunami activity:

 Location                   Lat.   Lon.    Time        Amplitude
 ------------------------  -----  ------  -------     -----------

 Point Reyes  CA           38.0N  123.0W  1810UTC   04.5FT/01.38M
 Port Orford  OR           42.7N  124.5W  1724UTC   06.1FT/01.85M
 Adak  AK                  51.9N  176.6W  1755UTC   03.6FT/01.09M
 Kodiak  AK                57.7N  152.5W  2211UTC   00.9FT/00.28M
 Los Angeles  CA           33.7N  118.3W  2115UTC   01.7FT/00.51M
 San Diego  CA             32.7N  117.2W  2131UTC   01.7FT/00.51M
 La Jolla  CA              32.9N  117.3W  2007UTC   01.4FT/00.43M
 Westport  WA              46.9N  124.1W  1920UTC   02.0FT/00.62M
 St Paul Is.  AK           57.1N  170.3W  1228UTC   02.1FT/00.65M
 Old Harbor  AK            57.2N  153.3W  2154UTC   01.1FT/00.33M
 Dutch Harbor  AK          53.9N  166.5W  1204UTC   01.3FT/00.41M
 Shemya  AK                52.7N  174.1E  1136UTC   05.2FT/01.58M
 Crescent City  CA         41.7N  124.2W  1656UTC   08.2FT/02.49M
 San Francisco  CA         37.8N  122.5W  1749UTC   02.1FT/00.64M
 Monterey Harbor  CA       36.6N  121.9W  2013UTC   02.4FT/00.72M
 North Spit  CA            40.8N  124.2W  1639UTC   03.3FT/01.01M
 Santa Barbara  CA         34.4N  119.7W  2229UTC   03.2FT/00.97M
 Santa Monica  CA          34.0N  118.5W  2223UTC   02.8FT/00.84M
Time - Time of measurement.
Amp. - Tsunami amplitudes are measured relative to normal sea level. It is NOT crest-to-trough wave height. Values are given in both meters (M) and feet (FT).

Tsunami amplitudes continue to decrease along the U.S. west coast... British Columbia and Alaska. However... some gages continue to report tsunami amplitudes of dangerous levels.
Tsunamis can be dangerous waves that are not survivable. Wave heights are amplified by irregular shoreline and are difficult to forecast. Tsunamis often appear as a strong surge and may be preceded by a receding water level. Mariners in water deeper than 600 feet should not be affected by a tsunami. Wave heights will increase rapidly as water shallows. Tsunamis are a series of ocean waves which can be dangerous for several hours after the initial wave arrival. DO NOT return to evacuated areas until an all clear is given by local civil authorities.

Pacific coastal regions outside California, Oregon, Washington, British Columbia, and Alaska should refer to the Pacific Tsunami Warning Center messages for information on the event.

This message will be updated in 60 minutes or sooner if the situation warrants. The tsunami message will remain in effect until further notice. For further information stay tuned to NOAA Weather Radio, your local TV or radio stations, or see the WCATWC web site.

Link to Standard Warning Message
Link to Public Warning Message
Link to XML/CAP Message
Link to Printable Message