Thank goodness we have Mammoth! Your Southern Sierra looks an awful lot like summer right now, but atop Mammoth Mountain there's got to be a solid 12 feet or so of snow. With the wind and sun in your favor, you'll find upper mountain skiing in great shape, and lower mountain groomers offering sweet but ephemeral turns in that short windows of opportunity between the opening bell and the onset of mash potatoes.
As for the backcountry, motivation will be key. With vital Tioga Pass Road still (pointlessly) closed, access remains poor to the healthiest snow fields. Skiers can only look longingly at the high peaks of Yosemite, where abundant snow awaits—if you can get there. Even in the Mammoth area, expect dry approaches, with skiable snow not appearing until 9 or even 10K feet. And when you do get there, variable slabs, mush, and facets may be your only reward...
SoCal Rains; Mountain Snows
The Well-Cooked Andy
A Very Cool August
Wahoo Gullies Are Burnt