Not sure what the coverage is up at big bear off mountain, but on mountain they're making snow and live streaming cams show a decent base on the hill itself (there are fire roads that snake all around on the opposite side of the mountain from the resort itself).
No guarantees though as to whether or not the fire roads around and behind the mountain are snow covered or not.
Lake Arrowhead webcams show small amounts of snow but nothing like the kind of coverage you're probably looking for.
That's all I know of in the LA area outside of Angeles Crest that you mentioned but even there, Mt. Wilson's tower-cam looks snow-free. Further east of there, past Waterman it's closed for a bit, so that may indicate some coverage.
Good luck!