Avalanche Advisory

Turnagain Area Avalanche Advisory
Forecaster:   Wendy Wagner  
Sunday, December 2nd 2012
Created: Dec 2nd 6:47 am
2 Moderate Alpine / Above 2,500' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
1 Low Treeline / 1,000'-2,500' Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
1 Low Below Treeline / Below 1,000' Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
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TOTE Maritime
The Bottom Line

Due to inadequate snow conditions and to prevent resource damage, operating or possessing a snowmobile on or within the Seward and Glacier Ranger Districts of the Chugach National Forest is prohibited until further notice.  You can view the official Forest Order for this closure HERE.

We continue to have a MODERATE avalanche danger today above treeline for persistent slab avalanches. The possibility remains that a person could trigger a slab breaking near the ground on steep slopes above 3000ft. As the snowpack, and remaining slabs, continue to deteriorate under cold and clear weather, loose snow sluffing is becoming more prevalent. Below treeline there is a LOW avalanche danger.

This Bottom Line will pertain to Monday, December 3rd, as well.

Primary Concern

Another sunny and cold day will continue to slowly reduce our persistent avalanche problem. We are still receiving reports of collapsing in the snowpack from folks getting off the beaten path into untracked, upper elevation areas which points directly to lingering slabs that can still be triggered by a person if the slope is steep enough. It is these areas we are most concerned with and that keep our danger above treeline at MODERATE.

That said, the majority of the terrain where people have been recreating lately is lacking a slab and the 2-3’ of snow cover consists mostly of various layers of weak, unsupportable snow. There has been a little too much P-Tex left out there not to my, or I believe anyone’s, liking.

As far as the surface conditions go, there is still plenty of soft “square powder” in wind sheltered locations. However, the past few days saw enough wind to form a thin, breakable crust in higher elevation exposed areas – not helping to improve the riding conditions and something to keep in mind with any new snow as the thin crust sits on very weak near surface facets. Surface hoar is anywhere between nonexistent up to 1cm above treeline but is growing some very large and impressive feathers in the creek bottoms.

As powder starved as we are right now, and with the hope of a shift in the weather for precip in the next week, we need to remember that our snowpack from top to bottom is full of weak layers. To use Kevin's "tent" analogy from yesterday, the tent is made of any of the following weaknesses from the peaks down to sea level: facets, surface hoar, near surface facets, depth hoar and crust/facet sandwiches. Things could get quite interesting very quickly avalanche wise once the snow finally does head our way.

Mountain Weather

This will be the 13th day in a row where sub-zero temperatures plague the lower elevations and parking lots in response to a region-wide inversion under clear skies. This morning is one the coldest so far: -21F in Portage (10ft above sea level) and warming with elevation to only +10F at the Sunburst weather station (3812ft). The good news is the wind has stayed fairly well behaved. Ridgetop winds switched around to the NW and W yesterday and are blowing around 5mph with gusts to 10mph currently, this is where they are expected to remain through the day.

It still looks like we could get a large scale pattern shift this coming week and a possible flurry or two Wednesday and Thursday with hopefully more soon after that. We should have a much better handle on this for Tuesday’s forecast so 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). 

I will issue the next advisory Tuesday morning, December 4th.

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: Nov 18, 2017 )

Glacier District
Johnson Pass: Closed
Placer River: Closed
Skookum Drainage: Closed
Turnagain Pass: ClosedOnly a few inches of snow sits at the motorized lot, not enough to open for snowmachining at this time. Updated Nov. 18, 2017
Twentymile: Closed
Seward District
Carter Lake: Closed
Lost Lake Trail: Closed
Primrose Trail: Closed
Resurrection Pass Trail: ClosedResurrection Pass trail is expected to open to snowmachine use during the 2017/18 winter season.
Snug Harbor: Closed
South Fork Snow River Corridor: Closed
Summit Lake: Closed

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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.

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