Its coming ...next year.
Tsunami debris spreads halfway across Pacific
Lumber, boats and other debris ripped from Japanese coastal towns by tsunamis last year have spread across some 3,000 miles of the North Pacific, where they could wash ashore on remote islands north of Hawaii this winter.
The National Oceanic and Atmospheric Administration estimated the first bits of tsunami debris will make landfall soon on small atolls northwest of the main Hawaiian Islands. The rest of the debris was expected to reach the coasts of Oregon, Washington state, Alaska and Canada between March 2013 and March 2014.
NOAA's tsunami marine debris coordinator, Ruth Yender, told an online news conference Tuesday that agency workers were boarding Coast Guard flights that patrol the archipelago. NOAA also asked scientists stationed at Midway and other atolls to look for the debris.
Debris initially collected in a thick mass in the ocean after tsunamis dragged homes, boats, cars and other parts of daily life from coastal towns out to sea. Most likely sank not far from Japan's eastern coast.
Read more: http://www.sfgate.com/cgi-bin/article.cgi?f=/n/a/2012/02/28/national/a004924S74.DTL#ixzz1nje3nDpq
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I wonder what, if anything, will hit the shores of SF?
Hmm.. perhaps I don't want to know 
could even be a house
