The Atmospheric River Event has begun and it isn’t disappointing. It dropped over 1 FOOT of snow on multiple California resort already. An Avalanche Warning has been issued for the Tahoe area as heavy snowfall will create unstable snow conditions.
2-4 FEET of snow is forecasted to fall Today-Tomorrow above 7500ft.
24 Hour Snowfall Totals As of This Morning:
Mammoth Mountain: 20″
Mt. Shasta Ski Park: 17″
Sugar Bowl: 16″
Northstar Resort: 13″
Kirkwood Resort: 12″
Squaw Valley: 12″
Ski China Peak: 12″
Homewood Mountain Resort: 9″
Snow levels are expected to start out around 6500-7000ft today, before dropping to 4500ft by Saturday morning.
Additional Storm Information:
California: 2-4 FEET of Snow Today-Tomorrow Above 7500ft
* Snow Accumulations: 2 to 4 feet of snow above 7500 feet  elevation. 6 to 12 inches around Lake Tahoe level, including  Truckee and South Lake Tahoe with the potential for up to 18  inches if snow levels drop sooner than currently expected. - NOAA Reno, NV
Tahoe Area Avalanche Warning:
URGENT - IMMEDIATE BROADCAST REQUESTED Avalanche Warning Forest Service Sierra Avalanche Center Relayed by National Weather Service Reno NV 744 AM PDT Fri Apr 7 2017 The following message is transmitted at the request of the Forest Service Sierra Avalanche Center. The Forest Service Sierra Avalanche Center has issued a backcountry Avalanche Warning. * Timing...in effect from 7 am Friday through 7 am Saturday. * Affected Area...for the Sierra Nevada Mountains of California  and Nevada, from Yuba Pass to Ebbetts Pass, including the Lake  Tahoe Basin. * Avalanche Danger...High. * Reason/Impacts...HIGH avalanche danger may exist in near and  above treeline terrain with CONSIDERABLE danger in below  treeline areas due to wind slabs and storm slabs. Natural and  human triggered avalanches are very likely today. Dangerous  avalanche conditions exist in the backcountry today. Travel in  avalanche terrain is not recommended. * Uncertainty...Due to uncertainty concerning snowfall amounts the  avalanche hazards could vary greatly from place to place. In  areas that receive the high end of forecasted snow amounts, more  avalanche danger and larger avalanche problems will exist. In  areas where snow totals only reach the low end of the forecasted  accumulation, the avalanche problems could be smaller and less  widespread.
Winter Storm Warning:
URGENT - WINTER WEATHER MESSAGE National Weather Service Reno NV 317 AM PDT Fri Apr 7 2017 Greater Lake Tahoe Area- Including the cities of South Lake Tahoe, Truckee, Stateline, and Incline Village 317 AM PDT Fri Apr 7 2017 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 5 PM PDT SATURDAY... * Timing: Heavy wet snow will spread to lake level by tonight  through Saturday. Snow should taper to showers on Saturday. * Snow Levels: Snow levels starting 6500-7000 feet today, falling  to 4500 feet by Saturday morning. Snow levels may fluctuate  around Lake Tahoe level during the day today. * Snow Accumulations: 2 to 4 feet of snow above 7500 feet  elevation. 6 to 12 inches around Lake Tahoe level, including  Truckee and South Lake Tahoe with the potential for up to 18  inches if snow levels drop sooner than currently expected. * Winds: Strong southwest winds area wide, with gusts Thursday  night through Saturday morning ranging from 45-55 mph along I-80  and near Lake Tahoe, and up to 135 mph along the higher mountain  peaks and ridges. * Impacts: Significant travel disruptions today at pass elevations  including Donner, Echo, Spooner, and Mount Rose summits. Travel  disruptions affecting mountain communities through Saturday  including around Lake Tahoe. Heavy wet snow and strong winds  could lead to downed trees and power outages.