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Walt, I think you're onto something with your explanation.
The heating-induced upslope will normally advect air
from the Central Valley that is potentially cooler than
the air to the E of the Sierra; if this air were to
tyoically make it to near the crest of the Sierra
(presumably this wouldn't hpn,
due to the distances involved, until afternoon),
it would be decidedly cooler on most days than that to
the east at the same altitude. Do you think that Valley
air does in fact make it to the crest frequently? I
suppose one sign of this would be increased haze visibly encroaching up the river gorges toward the crest during the afternoon.
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