Weather changes could bring snow to the Sierra and above Lake Tahoe by Monday

Weather changes with the potential for snow above Lake Tahoe and throughout the Sierra may be headed our way by Monday, the National Weather Service in Reno reports.
There will be a large pattern shift as low pressure digs southward along the West Coast. Forecast models show the jet stream will sag over the region bringing gusty winds to the valleys and strong ridge-line winds of 100 mph possible for the Sierra.
A significant moisture plume is showing to stream across central California bringing with it chances of rain with periods of heavy rain, with snow levels south of I-80 around the Lake Tahoe area lowering to 7,500 to 8,000 feet. Snow levels are expected to be lower over the northern Sierra of about 6,500 to 7,000 feet, according to the weather service.

The images above are model jet stream forecasts. The left-hand image shows high pressure and warmer conditions dominating through Sunday. The left image shows the transition to low pressure and cooler temperatures Monday into mid-week.