Heading up Patsy Marley Tuesday afternoon in the storm. 18 " or so of new snow that was bonding poorly to the base layer. Test slopes off the ridge popped right off, ~16" down, sliding on a firm base layer. Headed down the Southwest face of Patsy from the ridge about 200 yards below the "billboard". Ski cuts produced easily propogating slides down a clean bed surface. Proceeded down from island of safety to island of safety. When the clouds cleared we could see that the whole Southwest face had slide, with a crown running most of its length, clearing the storm snow.