Up to 12″ of Snow for Mammoth, CA Today & Tomorrow Mammoth ski resort is open and expecting 4-12 inches of snow today and tomorrow. Mammoth plans on closing on Sunday… unless they get enough snow out of this storm to stay open another week. NOAA has issued a Winter Weather Advisory for today and tomorrow with up to a foot of new snow forecast for the Pacific Crest. Mammoth just might close the season on a couple of powder days. The SnowBrains crew just got to Mammoth last night and we’ll be reporting from the hill the next few days to keep you posted on this potential snowfall. SnowBrains | May 7, 2015 0 Comments