Sun night (02/15) through Tue night (02/17) is the core punch, and many Sierra mountains can stack 20″-50″ in that window as snow levels crash. Expect a lighter start Sunday night, then snowfall rates ramp up hard Monday night into Tuesday with widespread coverage across Tahoe, the central Sierra, and down into Mammoth. Snow levels begin around 5,000 to 5,500 feet early, then fall into the 1,500 to 2,500-foot range by Tuesday and Tuesday night, which helps keep even lower terrain in play for all-snow.