3 hours ago Powderchaser Steve Winter Solstice! The moisture train is very long, chugging along slowly in the PNW and BC all week. It moves south to the Sierra by storm ski 9-14 inches by Tuesday. The Train moves east over the Rockies as it speeds up, dumping moderate snow on many areas. Extended is slightly cooler in the PNW, with many more rounds of snow that look a bit better for the Rockies by next weekend with colder air.