Snow is falling from base to top at Squaw Valley and Alpine Meadows, with some heavy bursts of snow due to the "convective" nature of the air mass moving in and across the region...
First, here is High Camp at Squaw as of 3:45pm, Sep 21, 2017
Here is the latest (as of 3:45pm) satellite and radar loop (please allow time to load)...
You can see the cold air and moisture to the northwest of the Tahoe area, and these showers are continuing to develop and move in. Our 3 to 5" of snow forecast for High Camp Squaw Valley was probably a low forecast snowfall estimate, as we stated yesterday, and we expect they will see 8 to 10 inches of snow by tonight at Squaw Valley High Camp 8,200 feet. Please see the latest water vapor shot below...
Please stay up to date with our custom forecast for Squaw, and check the long-range outlook, which is our own unique product: http://snowforecast.com/usa-forecasts/southwest-usa/california/squaw-valley-usa/