I hope you find your kayak.
I always worry about my kayak when I drive between Oceanside and San Clemente. It's usually very windy near the marine base and I have stopped a few times there to tighten my straps.
It looks like someone else lost a kayak in a similar way.
http://syracuse.craigslist.org/laf/1188466629.html
You should try putting a lost & found ad on craigslist.
Good luck.