A pattern change plunging into the northwestern United States this week will spread an early-season potential of snowfall, particularly across the mountain ranges. For some locations, forecasters say that the pattern this week will bring the first snowflakes since last winter. "A cold storm system sinking down out of western Canada will bring chances for accumulating snow to the highest elevations of the Northwest during the middle of this week," explained AccuWeather Senior Meteorologist Heathe