The latest weather model projections show significant amount of snow over the next 72 hours. This will certainly help California’s drought situation. However it’s going to completely cripple road travel over I80, Highway 50 299 32 and possibly Highway 70. The majority of snow is expected on Thursday night, and low snow levels down to 1000 feet are possible by Friday night.

H/T to Dr. Ryan Maue
In addition, gusty winds will give blizzard like conditions in the mountains, along with high winds in the Delta and foothills of the Sierra Nevada

In addition, significant amounts of rain will fall. Some low lying areas may see some flooding.

Are these projections or predictions by those prognosticators?
Monte Carlo scenarios ?
Try this:
https://en.wikipedia.org/wiki/Scenario_planning#Combination_of_Delphi_and_scenarios
In the past five days Squaw Valley USA ski resort received 90 inches of snowfall at the 8000 ft level.
… and in the past 24 hours, the “percent of normal” snow water equivalent for the Tahoe basin snowpack jumped from 25% to 42% of normal for the date.