In partnership with: Utah Division of State
Parks and Recreation, The Friends of the Utah Avalanche Center, Utah Department
of Emergency Services and Homeland Security and
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you on top”
AVALANCHE ADVISORY
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Thursday,
December 07, 2006 7:30 am
Good morning, this is Bruce Tremper with
the
UDOT plans to fire artillery
in Little Cottonwood Canyon this morning, Thursday, Dec 7th. Please stay clear of all south facing paths
between Maybird and
Congratulations
to Colleen Graham, the President of the Friends of the
Current Conditions:
Today will be yet
another great day to get up above the choking smog in the valleys and into the warm,
clean, sweet-smelling air in the mountains to blow the soot out of your
lungs. Last night was another clear night with balmy
ridge top temperatures around 27 degrees.
The humidity has started to rise, making temperature inversions in the mountain
valleys not quite so strong and it is warming up the snow surface
temperatures. Snow surface conditions
include the usual wide variety we get when it hasn’t snowed in awhile. There is still some soft, recrystallized snow
and nice riding conditions on the wind and sun sheltered slopes between about
8,000 and 9,500’. There is hard, wind-blasted
snow above tree line and various sun crusts on sun-exposed slopes.
Snowpack and Avalanche Conditions:
The snowpack is mostly stable, and there are only a
few isolated places where a person could trigger a slide. Stronger winds a few days ago created some
wind deposits in above-tree-line, wind exposed terrain but most of those slabs
have lost their stored elastic energy and are no longer sensitive to
triggers. Also, with today’s very warm
temperatures, there may be a few damp to wet sluffs you can get going on the
south facing slopes as they heat up in the warm, daytime sun. (Click
here for a current Snow Diagram)
The main thing we have to worry about is the
future. Clear skies create weak layers
of faceted snow and there is no lack of very weak, sugar snow especially on the
snow surface in wind and sun sheltered slopes.
It would be a good idea to get out over the next three days and
carefully memorize where this weak surface snow exists because an snow storm on Sunday night will likely produce sensitive avalanches
in these areas. In addition, the entire
snowpack is shallow and the clear skies have maintained strong temperature gradients
throughout the snowpack, which has rotted the entire snowpack into weak,
faceted snow in all the shallow snowpack areas.
Bottom Line:
The avalanche danger
is mostly LOW today.
Low danger does not mean no danger. There may be a few lingering wind slabs up
high and you can also get a few wet sluffs going on the steep, sun exposed
slopes today. But be aware, we expect
rapidly rising avalanche danger Sunday night as a storm arrives.
Mountain Weather:
Today should be yet
another beautiful, warm, sunny day in the mountains with continued
lung-clogging, cold smog in the valleys.
Ridge top temperatures will rise to the mid 30’s with 8,000’
temperatures rising into the mid 40’s.
Winds should be well behaved.
The main news is that we finally see a change in the pattern starting this
weekend. We may blow the smog out of the
valleys with a weak cold front on Saturday morning and a stronger cold front on
Sunday night may bring some significant snow to the mountains. Then, there is another storm on Tuesday and Wednesday.
Announcements:
Wasatch Backcountry Rescue
and Powderbirds will be testing a new helicopter-mounted avalanche receiver in
Little Cottonwood Canyon today, mostly over the
We appreciate any
snowpack and avalanche observations you have, so please leave us a message at
(801) 524-5304 or 1-800-662-4140, or email us at [email protected]. (Fax 801-524-6301)
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 Friday morning.