A bit suspicious since tomorrow calls for clear skies and 10-20mph winds. But according to the U.S.Navy:

"The Parade of Fleet Week Ships that was scheduled for 11:30 a.m. Saturday, October 11, 2008, has been cancelled. Due to unfavorable water conditions, the U.S. Navy regretfully advises that the ships will instead arrive on the morning of Sunday, October 12, 2008.

"The flight schedule for Fleet Week 2008 will remain the same, including the Blue Angels flying Saturday and Sunday at 3:00 p.m. Ship tours may be delayed slightly."

Alas. Read more about it at SF Citizen.