4-Day-Long MAJOR Winter Storm for Northern Rockies: Up to 1-2 Feet of Snow Expected NOAA is reporting that a “Major Winter Storm” with a “Dramatically Cold Arctic Air Mass” will begin affecting the Northern Rockies today through Tuesday. Western Montana has just been issued a 4-day-long Winter Storm Watch. We can’t remember a time where we’ve seen a 4-day-long winter storm watch. In addition to Montana’s winter storm watch, most of the mountainous areas of Idaho, Montana, and Wyoming have been issued Winter Weather Advisories. […] Weather SnowBrains | November 30, 2013 0 Comments