By Robert Lucke All winter recreationalists should be aware that
weather factors play a big part in avalanche activity in most
all mountains. The U.S. Forest Service has some weather related
tips. Wind - Even during clear weather, sustained winds of over
15 mph may cause danger to increase rapidly when loose surface
snow is available for transport. Snow plumes from ridges and
peaks indicate that snow is being moved onto leeward slopes.
This can create dangerous situations. Leeward slopes are
dangerous because wind-deposited snows add depth and may create
unstable wind slabs. Windward slopes generally have less snow
and the snow is compacted and usually more stable toward the
leeward slopes. Storms - A high percentage of all avalanches
occur shortly before, during, and after storms. Be extra
cautious during these periods. Rate of Snowfall - Snow falling
at one inch per hour or more increases avalanche danger rapidly.
Crystal Types - Observe snow-crystal types by letting them fall
on a dark ski mitt or parka sl