Loc: North San Diego County
I think hurricanes or cyclones can form anyplace the ocean water is over 83 degrees F. If the Gulf gets that hot, then we have to expect hurricanes. They come up the Gulf of California quite nicely because the water is hot. If they are on the Mexican west coast, they die before getting to San Diego because the Pacific coast of the US is never that warm.
The worst effect we get here is a few days of high humidity when one comes up the slot to Arizona.