San Francisco has many micro climates, and Pacific Heights is one usually free from the swirling fog that often shrouds the Golden Gate bridge and envelopes the streets in the more western parts of the City.
Not so a few mornings ago when I walked along Jackson Street. It was still heavy an hour later on my way back. The fog didn't stop the wild parrots from squawking and flitting about, nor the walkers, joggers, and dogs from frolicking.
Just one more thing for which to be thankful - the mysterious fog that gives familiar sights a new appearance.