My previous post was assuming it was a missile launch, for the sake of investigation. We have had these rocket vapor trails in the past off the coast. Normally they just state a rocket was launched at Vandenberg. You know there were people who bought homes on hills in the Lompoc area that could have watched Shuttle launches fairly closeup right from their patios. Unfortunately they scrubbed launching the shuttle from there due to fog I believe.
Iran has test-fired a sea-launched ballistic missile, according to classified U.S. intelligence reports, which could be used in a devastating stealth attack against the United States or Israel for which the United States has no known or planned defense.
The article is from 1999 too so we could safely assume that Iran has improved its capabilities since then.