Tsunami advisory issued for California coast

Updated

Posted by
Sat, February 27, 2010


UPDATE at 10:56: Forecast initial wave height in Half Moon Bay is 3.3 ft, shortly before forecast arrival in San Francisco at 1:26pm today.

A tsunami advisory (low-level warning) has been issued for the coastal areas along California. The tsunami is expected reach San Francisco at 1:26pm, and the San Mateo coast shortly before that.

Significant widespread inundation is not expected for areas under an advisory.  Tsunami advisories mean that a tsunami capable of producing strong currents or waves dangerous to persons in or very near the water is imminent or expected.   

Currents may be hazardous to swimmers, boats, and coastal structures and may continue for several hours after the initial wave arrival.


I haven’t heard a word about this anywhere else, nor have I heard any advisories.  I’m at less than 50 feet above sea level where I live…...

Comment 2
Sat, February 27, 2010 8:12am
Rick Nelson
All my comments

This is all direct from the NWS web site (the capitalization is thiers not mine):

TSUNAMI ADVISORIES MEAN 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. THE INITIAL WAVE WILL NOT BE THE LARGEST. COASTAL RESIDENTS ARE ADVISED TO STAY OUT OF THE WATER…OFF THE BEACH…AND AWAY FROM HARBORS AND MARINAS. WAVE HEIGHTS AND CURRENTS ARE AMPLIFIED BY IRREGULAR SHORELINE AND ARE DIFFICULT TO PREDICT. THE TSUNAMI MAY NOT BE VISIBLE AMONG THE COMMON OCEAN SURF…YET TIDE GUAGES WILL LIKELY REPORT SOME FLUCTUATIONS.
The part about harbors and irregular shorelines kind of got my attention, I went to the Harbormaster this morning about 6:30 and he said they “were going to have a conference call”. Does this mean they don’t have a pre-existing plan for when a tsunami advisory goes into effect?

Comment 3
Sat, February 27, 2010 8:31am
jlundell
All my comments

NWS at 10:10: “Latest intel from the Tsunami Warning center brings initial waves into Santa Barbara at 12:31pm this afternoon… reaching San Francisco around 1:26pm. Forecast wave heights along the California coast include 4.6 feet at Pismo Beach… 3.3 feet at Half Moon Bay and 0.7 feet at San Francisco.”

Comment 4
Sat, February 27, 2010 10:24am
jlundell
All my comments

NWS at 11 (more detail; no real change).

Tsunami Warning center. Biggest concern will be south to southwest facing beaches. Outside of our area the latest model runs show a 4.6 foot wave at Pismo Beach in San Luis Obispo County. No real change in wave arrival times with 12:31pm at Santa Barbara and 1:26pm at San Francisco. Forecast wave heights still 3.3 feet for Half Moon Bay and 0.7 feet for San Francisco. Local areas of increased concern would be north side of Monterey Bay in the vicinity of Santa Cruz/Capitola. Also San Mateo coast and Half Moon Bay as well as the Marin coast. Hopefully the fresh images of the Mavericks wave event will help to keep people clear of the area beaches. Even though intitial waves will arrive after midday… the peak wave action may be delayed several hours. Best course of action will be to stay away from the coast the rest of today… including surfers. Please help local officials by taking this tsuanmi advisory seriously and resist the urge to visit the beaches/coast. Coast guard and other agencies are already swamped. More information as it becomes available.

Comment 5
Sat, February 27, 2010 11:15am
Terry Baldwin
All my comments

Is that why Poplar St. Beach parking is closed off? It’s a pretty high cliff and they didn’t close Kelly St.