Very exciting trip. Arrived from California on Friday night, fully expecting Saturday to be a casual day around camp as light rain was expected. But woke to crystal blue skies so decided to go ahead and climb Signal Peak via the Class 3 to low Class 5 route (forgot the name). Hike up was pretty straight forward, beautiful and interesting. roped up at bottom of main headwall, scrambled up, left rope here and continued to summit. Arrived on the summit with mild winds, and beautiful views. After signing the register, turned to descend and was amazed at how quickly a wet fog had rolled in. I meandered off course several times, and then assumed the worse and figured on an unplanned bivy near the summit not knowing where my canyon was below me. After about an hour, the fog cleared enough for me to see where my descent was and I quickly hustled to make it down the mountain. Once below the main headwall, fog and darkness over took me, and once again, I was forced to bivy with just shorts, wind jacket. A cold wet fog blew in on heavy winds and a cold rain fell al night. It was a long and cold night. Morning couldn't come fast enough, and when it did, I hurried down to camp, made a warm fire, at a huge meal and relaxed in the sun. All in all, a very beautiful and rewarding summit/experience.