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Good Morning. This is Bruce Tremper with the
Current Conditions:
As
Avalanche Conditions:
Yesterday was one of the best
days of the year with close to a foot of light, new snow and sunny skies and it
really brought everyone out to enjoy life.
As you might imagine, some of them also enjoyed seeing some avalanche
activity, some closer than they probably wanted. Yesterday there were a couple human triggered
avalanches in the Monitors on the Park City-Big Cottonwood ridgeline. They were east facing slopes, one 100 feet
wide and another 200 feet wide. One was
triggered by a skier as he approached an extremely sensitive cornice from the
top. A snowboarder triggered a smaller
one in White Pine in Little Cottonwood Canyon on a steep, treed rollover about
20 feet wide and a couple feet deep.
Control work at the resorts produced a monster, 250 foot wide slide a
couple feet deep on the Park City side of the range and in the Cottonwood
Canyons, besides explosive controlled avalanches, one patroller was able to ski
cut a slide about 40 feet wide. For more
details on these avalanches, call 801-364-1591.
All these slides are dry slab
avalanches breaking about two feet deep on the old, extremely weak faceted snow
that is taking an astounding long time to gain strength.
We’ve had a considerable or
higher danger rating for the past two weeks, and in my memory, this is the
longest time we have gone with continually scary avalanche conditions. Every day I go into the field thinking that surely
we can lower the danger rating from considerable to moderate, but each day, I
come back with my tail between my legs being frightened by what I see myself
and hear about from others. For
instance, yesterday as I tip-toed along the very crest of the rocky ridge
between upper Days and Silver Fork, I continually collapsed the snow and one
collapse, propagated the fracture onto the slope well below me, where a hanging
snowfield about the size of a foot ball field filled with cracks like a spider
web. It was only 33 degrees but if it
was about 35 degrees or steeper, it probably would have slid, and it certainly
would have been an impressive sight from my safe perch on the rock ridge above. There’s all kinds of slopes similar to this
out there still hanging in the balance, where the wimpy weight of a person can
make the slope shatter like glass.
As we continue to add weight
on top of the fragile, buried weak layers, the danger will only get worse
today. Also, this morning’s snow is denser
than the light fluffy snow on the ground yesterday, so you will likely see some
soft, shallow slabs formed from upside-down snow.
Bottom Line (SLC,
It’s not dangerous everywhere,
just on some slopes. The avalanche
danger is CONSIDERABLE
today on slopes which face the north half of the compass, plus east facing
slopes above about 8,500’ that are about 35 degrees or steeper and also on any
steep slope with recent deposits of wind drifted snow. There is a MODERATE avalanche danger on slopes facing the
south half of the compass and a LOW danger on slopes less than 30 degrees, which are not connected
to steeper slopes above.
Mountain Weather:
Today, the first half of this
storm will probably put down about 6 inches of snow on a southwest flow and
then after a short break this morning, this afternoon and New Year’s Eve, the snow
should start up again, possibly with lightning, and the flow should turn
northwesterly and continue to snow, adding probably another 6 inches of snow
and possibly a foot in places favored by a northwest flow such as the
Cottonwood Canyons. Ridge top winds will
blow around 20 mph from the southwest today, swi
General Information:
Wasa
The Friends of the
To report backcountry snow
and avalanche conditions, especially if you observe or trigger an avalanche,
call (801) 524-5304 or 1-800-662-4140, or email to [email protected] or fax to
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.
Evelyn Lees will update this advisory by
Thanks for calling!
________________________________________________________________________
National Weather Service - Salt
Lake City - Snow.
For an explanation of
avalanche danger ratings: