Margaret Lindgren is the owner of Unbeaten Path Tours. She recently took clients out to the Point Arena-Stornetta Lands. This is what they found - a fogbow or white rainbow.
They are pretty rare. Look for one in the morning hours when the fog is about bluff high. Perhaps you will see a fogbow too.
Thanks to Margaret for allowing me to share her photos with you here. To learn more about Margaret's hiking tours, here is the link to her website: http://www.unbeatenpathtours.com/index.html