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Avalanche Advisory

Turnagain Area Avalanche Advisory
Saturday, January 11th 2014 6:54 am by Kevin Wright
ARCHIVED ADVISORY - All advisories expire after 24 hours from the posting date/time.
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The Bottom Line

Specific areas above treeline remain CONSIDERABLE because we believe very large human triggered avalanches can still be initiated.  Test pit results have not improved since the storm last weekend.  Finding avalanches today will be unlikely unless traveling in steep terrain.  Trigger points, where the weak layer can be collapsed at a shallow point in the slab, may be hard to find.  However, if this were to happen today the resulting avalanche may take the entire slope at 2-3 feet deep.

 

Below treeline is a MODERATE danger, where we are still experiencing collapsing (whumphing).  Steep pockets, even at lower elevations should be approached with some caution.  


 Show the Complete North American Avalanche Danger Scale
3 Considerable Alpine / Above 2,500' Travel Advice: Dangerous avalanche conditions. Careful snowpack evaluation, cautious routefinding and conservative decision-making essential.
2 Moderate Treeline / 1,000'-2,500' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
2 Moderate Below Treeline / Below 1,000' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
Avalanche Problem 1

The persistent slab is a problem that doesn't go away quickly.  The last major storm was on Sunday, almost a week ago.  Since that storm, when many large avalanches were recorded, we haven't seen a lot of avalanche activity.  This is mostly due to a lack of triggers (people) in the backcountry this week.  However, the problem has been bad enough to warrant an extended stretch of elevated danger ratings.  Our test pits performed every day this week have not shown appreciable improvents in the strength or propagation potential of the snowpack.  Check this video for a test done yesterday on Pete's North.

It's worth recapping some of our recent avalanche activity to pick out the trends.  Avalanches have been triggering remotely, often from ridges and propagating across large distances.  Wind blown ridges offer a trigger point where the snowpack is shallow and a person's weight is more likely to collapse the buried weak layer.  In deeper areas, a collapse may still be caused by a larger trigger such as a snowmachine or a group of people.  Avalanches have been observed on all aspects (N, S, E, and W), and elevations from just below treeline to >3500 feet.  Few people have ventured into higher elevation steep terrain, which is a good self-preservation tactic right now.

Standard warning signs such as whumphing, shooting cracks, or avalanches on small indicator slopes are unlikely right now.  Avoiding steep terrain is the only effective management tool we have to deal with the current problem.


Mountain Weather

No new snow has accumulated in the last 24 hours.  The last major storm ended on Sunday.  This week has been mild weather with warm temperatures, little precipitation, and light wind.

Today we can expect mostly cloudy skies, highs in the mid 20s.  Mostly light wind.

The next storm system may arrive by the middle of the coming week.  Stay tuned.

 

 

This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area (this advisory does not apply to highways, railroads, or operating ski areas).

Winter snowmachine use open/closed status and riding conditions updates

Riding status is not associated with avalanche danger. An area will be open to motorized use in accordance to the Forest Management Plan when snow coverage is adequate to protect underlying vegetation. Backcountry hazards including avalanche hazard are always present regardless of the open status of motorized use areas.

(Updated: May 06, 2018 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: ClosedClosed as of April 20th
Placer River: ClosedClosed as of April 17th
Skookum Drainage: ClosedClosed as of April 1st.
Turnagain Pass: ClosedClosed as of May 7th. Happy summer, see ya when the snow flies!
Twentymile: ClosedClosed as of April 13th
Seward District
Carter Lake: ClosedClosed as of 4/27
Lost Lake Trail: ClosedClosed as of April 13th
Primrose Trail: ClosedClosed as of April 13th
Resurrection Pass Trail: ClosedClosed as of April 20th
Snug Harbor: ClosedClosed as of 4/27
South Fork Snow River Corridor: ClosedClosed as of April 13th
Summit Lake: ClosedClosed as of April 20th

Subscribe to the Turnagain Area Avalanche Advisory:

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. This advisory provided by the Chugach National Forest, in partnership with Friends of the Chugach National Forest Avalanche Information Center.


USFS SNOW AND AVALANCHE HOTLINE (907) 754-2369
If you have comments or questions regarding CNFAIC operations or winter recreation management, please email staff@chugachavalanche.org
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