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Avalanche advisory
Sunday, April 03, 2005
Good morning, this is Drew Hardesty with the
Current Conditions:
Overnight lows point to a thin refreeze above about 9500’ and none at all below
that. Clear skies and increasing
southwest winds in the 20’s and 30’s certainly help with both convective and
long wave radiational cooling, but the mid and low elevations will still be wet
and gloppy this morning. There’s still a
little heavy powder on the upper elevation north-facing slopes, but the demand
for it seems non-existent. Powder-snobs need only wait another 24 hours for
another storm, which should give us another 12-16” or so.
Avalanche Conditions:
The heating continued to punish the snowpack
with more natural wet slabs pulling out, predominantly on mid and upper
elevation southeast facing slopes. The most
dramatic slide pulled out just about the entire southeast face of
For today, due to the
temperatures, mid and lower elevation sun-exposed slopes will have a much
narrower window of safe travel. I’d
recommend being off of them by mid-morning, if they’re worth being on at
all. The mid and low elevation northerly
slopes will be saturated and loose and it’ll be worth watching how much snow
you can push around. Glide avalanches on
the steeper northeast facing slopes may be a problem as well. Truthfully, it’ll be difficult to gauge the
avalanche conditions as it’ll be a battle between increasing clouds and
stronger winds with the poor refreeze.
Best to stay conservative on the saturated slopes today and wait for
things to lock up with tomorrow morning’s cold front so we can deal with
avalanche problems that are a little less sinister.
Bottom Line (
This
morning, there is a MODERATE danger on mid and upper
elevation northerly slopes steeper than 35 degrees, especially with recent
deposits of wind-drifted snow. With the
poor refreeze, the wet slab avalanche danger will again rise to CONSIDERABLE
with daytime heating, particularly on the more protected steep sun-exposed
slopes as well as on the lower elevation northerly slopes.
Danger Scale: http://www.avalanche.org/~uac/ed-scale.htm
Mountain Weather: (You can find the afternoon
Weather Update here.)
Partly cloudy skies will give way to increasing clouds ahead of tomorrow’s
approaching storm. 8000’ highs will be
in the low 50’s with 10,000’ highs around freezing. The 20-35mph southwesterly winds will only
increase during the day. Tomorrow’s cold
front will again drop ridgetop temps to the low teens with light to moderate
northwesterly winds after frontal passage.
Areas favored by a northwest flow should see a foot to a foot and a half
by late Monday.
Yesterday,
the Powderbird guides were in AF and are unlikely to get out today.
If you are getting out, we appreciate
your snowpack and avalanche observations.
Please call and leave a message at 524-5304 or 1-800-662-4140, or e-mail
us at [email protected]. Fax is 524-6301.
The information in this
advisory is from the U.S. Forest Service, which is solely responsible for its
content. This advisory describes general avalanche conditions and local
variations always occur.
Brett Kobernik will update
this advisory by 7:30 on Monday morning.
Thanks for calling.