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-   -   !!!tsunami warning for british columbia!!! (http://www.sailnet.com/forums/general-discussion-sailing-related/93523-tsunami-warning-british-columbia.html)

MedSailor 10-28-2012 01:02 AM

!!!tsunami warning for british columbia!!!
 
Just got this alert from NOAA. Expected to hit areas of BC and Alaska within the next 15 minutes.


http://wcatwc.arh.noaa.gov/events/PA...A41/WEPA41.txt

WEAK51 PAAQ 280334
TSUAK1

BULLETIN
PUBLIC TSUNAMI MESSAGE NUMBER 2
NWS WEST COAST/ALASKA TSUNAMI WARNING CENTER PALMER AK
834 PM PDT SAT OCT 27 2012

THE MAGNITUDE IS UPDATED TO 7.7. THE WARNING ZONE REMAINS THE
SAME.

...THE TSUNAMI WARNING CONTINUES IN EFFECT FOR THE COASTAL
AREAS OF BRITISH COLUMBIA AND ALASKA FROM THE NORTH TIP OF
VANCOUVER ISLAND BRITISH COLUMBIA TO CAPE DECISION
ALASKA/LOCATED 85 MILES SE OF SITKA/...

...THIS MESSAGE IS INFORMATION ONLY FOR COASTAL AREAS OF
CALIFORNIA - OREGON - WASHINGTON AND BRITISH COLUMBIA FROM
THE CALIFORNIA-MEXICO BORDER TO THE NORTH TIP OF VANCOUVER
ISLAND BRITISH COLUMBIA...

...THIS MESSAGE IS INFORMATION ONLY FOR COASTAL AREAS OF
ALASKA FROM CAPE DECISION ALASKA/LOCATED 85 MILES SE OF
SITKA/ TO ATTU ALASKA...

A TSUNAMI WARNING MEANS... ALL COASTAL RESIDENTS IN THE WARNING
AREA WHO ARE NEAR THE BEACH OR IN LOW-LYING REGIONS SHOULD MOVE
IMMEDIATELY INLAND TO HIGHER GROUND AND AWAY FROM ALL HARBORS AND
INLETS INCLUDING THOSE SHELTERED DIRECTLY FROM THE SEA. THOSE
FEELING THE EARTH SHAKE... SEEING UNUSUAL WAVE ACTION... OR THE
WATER LEVEL RISING OR RECEDING MAY HAVE ONLY A FEW MINUTES BEFORE
THE TSUNAMI ARRIVAL AND SHOULD MOVE IMMEDIATELY. HOMES AND
SMALL BUILDINGS ARE NOT DESIGNED TO WITHSTAND TSUNAMI IMPACTS.
DO NOT STAY IN THESE STRUCTURES.

ALL RESIDENTS WITHIN THE WARNED AREA SHOULD BE ALERT FOR
INSTRUCTIONS BROADCAST FROM THEIR LOCAL CIVIL AUTHORITIES.
EARTHQUAKES OF THIS SIZE ARE KNOWN TO GENERATE TSUNAMIS.

AT 804 PM PACIFIC DAYLIGHT TIME ON OCTOBER 27 AN EARTHQUAKE WITH
PRELIMINARY MAGNITUDE 7.7 OCCURRED 25 MILES/40 KM SOUTH OF
SANDSPIT BRITISH COLUMBIA.
EARTHQUAKES OF THIS SIZE ARE KNOWN TO GENERATE TSUNAMIS.
IF A TSUNAMI HAS BEEN GENERATED THE WAVES WILL FIRST REACH
LANGARA ISLAND BRITISH COLUMBIA AT 916 PM PDT ON OCTOBER 27.
ESTIMATED TSUNAMI ARRIVAL TIMES AND MAPS ALONG WITH SAFETY RULES
AND OTHER INFORMATION CAN BE FOUND ON THE WEB SITE
WCATWC.ARH.NOAA.GOV.

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 THIS EVENT AT
PTWC.WEATHER.GOV.

THIS MESSAGE WILL BE UPDATED IN 30 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.

$$

sailjunkie 10-28-2012 02:01 AM

Re: !!!tsunami warning for british columbia!!!
 
Thankfully, Natural Resources Canada is reporting no injuries or damage, so far.

MedSailor 10-28-2012 02:59 AM

Re: !!!tsunami warning for british columbia!!!
 
MEASUREMENTS OR REPORTS OF TSUNAMI ACTIVITY

LOCATION LAT LON TIME AMPL
------------------------ ----- ------ ------- -----------
DART46419PT NW SEATTLE 48.8N 129.6W 0345UTC 00.2FT/00.07M
CRAIG AK 55.5N 133.1W 0427UTC 00.4FT/00.11M
PORT ALEXANDER AK 56.2N 134.6W 0410UTC 00.3FT/00.08M
WINTER HARBOUR BC 50.7N 128.3W 0402UTC 00.5FT/00.15M
SITKA AK 57.1N 135.3W 0424UTC 00.3FT/00.08M


0.5 ft tsunami in BC. Doesn't sound that bad, though I have no concept of how different a 1/2 foot tsunami wave is from a regular one.

The information above was included in a message that stated that the tsunami advisory had been increased to include Oregon and northern California. Why, would you widen the advisory area when you're getting data like 0.2ft in Seattle?

BTW, if you live aboard and don't yet have your phone set up for tsunami alerts from NOAA or the Canadian equivalent, you might want to think about doing so.

G'night all!
http://www.642weather.com/weather/in...unami_sign.jpg


MedSailor

addict 10-28-2012 03:53 AM

!!!tsunami warning for british columbia!!!
 
It's been lifted to an advisory.

delite 10-28-2012 04:23 AM

Re: !!!tsunami warning for british columbia!!!
 
The local news reported a 42cm wave headed for Hawaii. Nothing locally and no damage according to the news

Dog Ship 10-28-2012 08:10 AM

Re: !!!tsunami warning for british columbia!!!
 
I would hear sirens if anything was happening and I don't hear anything.

Faster 10-28-2012 11:59 AM

Re: !!!tsunami warning for british columbia!!!
 
Jeez, Dog Ship... you were up early!!

Latest news locally everythings downgraded. According to an SFU geologist this is a very interesting scenario. Typically on the north coast it's a San-Andreas type fault and mainly horizontal plate movement is expected. The vertical movement required to generate tsunamis is not a normal part of the pattern (unlike what might be expected on the south coast area, apparently.. though the Alaskan quake in the 60s certainly sent a wave down here at that time)

Anyhow we've been lucky.. 7.7 is not trifling, there are no reports of any injuries and the tsunami concerns are fading by the hour.

emoney 10-28-2012 12:29 PM

Re: !!!tsunami warning for british columbia!!!
 
Wow, very interesting. I guess the warning system doesn't have a lot of advance notice on these things. At least, from halfway across the Continent it doesn't seem like there's been much talk about it. Hope everyone is ok.

whroeder 10-28-2012 12:48 PM

Re: !!!tsunami warning for british columbia!!!
 
Quote:

Originally Posted by MedSailor (Post 939488)
0.5 ft tsunami in BC. Doesn't sound that bad, though I have no concept of how different a 1/2 foot tsunami wave is from a regular one.

If you are standing in a flooded road and a truck makes a 6 in wave, you get a little wetter.
If you are standing in a flooded road and a 6 in tsunami comes in, you would be now standing in a 1 ft RIVER watching cars float by.
Comparing water level before and after the initial wave, looks to me to be 6-10 in.

blt2ski 10-28-2012 01:11 PM

Re: !!!tsunami warning for british columbia!!!
 
Must not be that big a deal, can not find anything really quick on th internet either........hmmmmmm may have to try a few more sites yet....

marty


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