The Weekend looks quite stormy with periods of heavy snow with little let up in the snowfall through Monday night….snow showers may continue into Tuesday. Latest guidance from the NAM shows a surface low undergoing rapid cyclogenesis with the surface low deepening from 1002MB 12Z friday to 979mb by 15Z Saturday west of Monterey Bay. This is just short of the classification of Bombogenesis which is 24MB of deepening within 24 hours. This trend is strengthening so will revisit in the morning. This will bring very strong winds to Coastal Bay Area FRIDAY NIGHT! The Golden Gate will be awesome! The cold front will be quite strong with heavy rains. Gradual weakening will occur as the front moves east but Heavy Snow in the Sierra a good bet, especially late Friday night into Saturday. It will be windy as well….

 

Next System moves in Sunday with heavy snow Sunday afternoon and Night.  gradients look strong enough for blizzard conditions Sunday Afternoon and night. Especially with the snow to water ratios increasing…

The last and final system has tapped modified arctic air from Western Canada with the coldest air of the season headed into Northern and Central CA. 700MB temps will fall to -17 or -18C by Tuesday AM.

Platinum Powder criteria is a possibility Monday and Monday night with 6 to 12 inches of the fluff possible by Tuesday AM.   Will consider Platinum Powder Watch tomorrow For Monday……

All considered, some 4 to 6 feet of new snow is a possibility for the period beginning later Friday afternoon through Monday night over Mammoth Mt with 2 to 3 feet in town the same time frame…..