John Batchelder noticed the tall dorsal fin indicative of an Orca, aka Killer Whale. Then he saw a second one. California Sea Lions had been seen rafting in the same area two days earlier.

 Orcas aren't Whales - they are actually Dolphins, albeit BIG ones!

Below you will see the Sea Lions John photographed two days before the Orcas showed up.

Orcas hunt Sea Lions, among other large creatures of the sea. Thanks to John for allowing me to share his photos with you here.