Yesterday's near perfect weather is now but a sepia-toned memory. Reports of a strange, icy substance, often referred to as "snow," is falling on Mount Diablo, Mount Hamilton in Santa Clara County, Mount Hamilton, and (any minute now) Mount Tam. It's also blanketing the eerie Santa Cruz Mountains, resulting in the closure of Highway 9. It looks like many of you will have to take Highway 17. If you dare. Oh, and be sure......