WCATWC Tsunami Advisory - TW

WEAK51 PAAQ 300630
TSUAK1

BULLETIN
PUBLIC TSUNAMI MESSAGE NUMBER 8
NWS WEST COAST/ALASKA TSUNAMI WARNING CENTER PALMER AK
1130 PM PDT TUE SEP 29 2009

...A TSUNAMI ADVISORY IS IN EFFECT WHICH INCLUDES THE
COASTAL AREAS OF CALIFORNIA AND OREGON FROM THE
CALIFORNIA-MEXICO BORDER TO THE OREGON-WASHINGTON BORDER...

...THIS MESSAGE IS INFORMATION ONLY FOR COASTAL AREAS OF
WASHINGTON - BRITISH COLUMBIA AND ALASKA FROM THE
OREGON-WASHINGTON BORDER TO ATTU 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 IMMINENT OR 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 1048 AM PACIFIC DAYLIGHT TIME ON SEPTEMBER 29 AN EARTHQUAKE WITH
PRELIMINARY MAGNITUDE 8.0 OCCURRED
IN THE SAMOA ISLANDS REGION.
THIS EARTHQUAKE HAS GENERATED A TSUNAMI WHICH COULD CAUSE DAMAGE
TO REGIONS IN A WARNING OR ADVISORY.
ESTIMATED TSUNAMI ARRIVAL TIMES AND MAPS ALONG WITH SAFETY RULES
AND OTHER INFORMATION CAN BE FOUND ON THE WEB SITE
WCATWC.ARH.NOAA.GOV.

A TSUNAMI HAS BEEN OBSERVED AT THE FOLLOWING SITES

LOCATION LAT LON TIME AMPL
------------------------ ----- ------ ------- -----------
EASTER ISLAND CHILE 27.1S 109.3W 0342UTC 0.25M/0.8FT
CHARLESTON OR 43.3N 124.3W 0528UTC 0.13M/0.4FT
PORT ORFORD OR 42.7N 124.5W 0509UTC 0.17M/0.6FT
SOUTH BEACH OR 44.6N 124.0W 0545UTC 0.09M/0.3FT
SHEMYA AK 52.7N 174.1E 0456UTC 0.10M/0.3FT
CRESCENT CITY CA 41.7N 124.2W 0605UTC 0.21M/0.7FT
ARENA COVE CA 38.9N 123.7W 0459UTC 0.33M/1.1FT
PORT SAN LUIS CA 35.2N 120.8W 0531UTC 0.30M/1.0FT
THE TSUNAMI IS REACHING ITS MAXIMUM AMPLITUDE AT MANY LOCATIONS
ALONG THE WEST COAST. EXPECTATIONS ARE FOR THE AMPLITUDE
TO DECREASE OVER THE NEXT FEW HOURS. THE CENTER WILL CONTINUE
TO MONITOR THIS EVENT UNTIL ALL POTENTIAL DANGER IS PASSED.

TIME - TIME OF MEASUREMENT
AMPL - 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).

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.

THIS MESSAGE WILL BE UPDATED IN 120 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 WEB SITE WCATWC.ARH.NOAA.GOV.

$$