I was about three hours into my trip from Pheonix to
Apple Valley in a Cessna 152 when I called flight service
for a weather update.  The weather had changed from 20
gusting 30 to "30 gusting 40 from 300 with moderate 
turbulence."  I was near Big Bear at 9500 and had moved
east of course due to turbulence.  Because of the heavy
headwind, I considered landing at Big Bear, but as I
overflew the runway, the crosswind and turbulence were
too strong for a landing.
  As I flew NE of the field towards Apple Valley, strong
downdrafts on the leeward side of the 8336 foot peak drove
me down at 1000 ft/min, even at best rate of climb.  I
flew out of the downdraft at 500 AGL and 5000 feet,
continuing toward APV.  At that altitude I had trouble
contacting ATC or getting any VOR reception, so another
plane relayed my messages and "minimum fuel" and
I got vectors to APV.  I finally saw the airport, right
at sunset, and landed on 26 (with very little crosswind).
I taxied very fast to keep the plane from flipping, and
parked.  2.5 gallons remained in the tanks.
  With only 100 hours and no previous mountain experience,
I hadn't gotten a weather update quickly enough to avoid
the turbulence, downdrafts, or headwind.  Given the
crosswinds, Big Bear, Yucca Valley, and Hi-Desert were
unsafe.  An extra fuel stop would have been very helpful.