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Turnagain Pass Avalanche Forecast RSS

Archives
ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Sun, December 11th, 2011 - 7:00AM
Expires
Mon, December 12th, 2011 - 7:00AM
Forecaster
Wendy Wagner
The Bottom Line

Good morning. This is Wendy Wagner with the Chugach National Forest Avalanche Information Center on Sunday, December 11th at 7am. This will serve as 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).

ANNOUNCEMNTS

Don’t miss Wednesday nights big double premiere and CNFAIC benefit!! “The Continuum” along with “One For the Road” will be playing at the Sitzmark Bar & Grill – Alyeska Resort. More details are on our training and calendar page. Also, the string band Midnight Sun Zombies, will be playing. Come on out and show your support!

BOTTOM LINE

The avalanche danger is CONSIDERABLE for wind slab avalanches on all wind drifted slopes due to strong wind and new snow overnight and throughout today. Naturally occurring wind slab avalanches are possible and human triggered avalanches are likely. Expert level route finding and terrain management skills will be necessary for backcountry travel today.

AVALANCHE DISCUSSION

A pulse of new snow and strong wind overnight has increased the avalanche danger. Around 6-8” of snow has fallen above 2000′ in the Girdwood Valley, Turnagain Pass and Summit Lake areas. The snow has come in with sustained northeasterly winds around 35-40mph, gusting to 70mph. Snowfall and wind have tapered off this morning, but are forecast to intensity again throughout the day.

Wind slab avalanches are the primary concern. Fresh deposits of wind drifted snow will be sensitive and likely easily triggered by a person. Watch for unusual loading patterns from the strong winds at all elevations. This includes, wind slabs building mid-slope and around subtle terrain features. The slabs formed overnight and today should vary in depth and strength, from deep and soft to hard and supportable. Deep wind slabs and slabs that are supportable have the best chance of breaking above you and taking you for a ride.

If there are any areas that have escaped wind damage, watch for soft slab avalanches. The new snow has fallen with increasing temperatures causing an “upside down” layering. This set up will enhance the instability in the new storm snow.

MOUNTAIN WEATHER

Yesterday afternoon, skies became cloudy and winds picked up ahead of a storm system impacting our area today and into Monday. Overnight, winds blew on the ridge tops from the NE at 40mph with gusts into the 70’s. Snowfall, adding up to 6-8” above 3000′ and 2-3” at 1800′, accompanied the wind. Temperatures have risen 2-5 deg. F at most stations and are currently around 30F at 1800′ and in the mid 20’s at 3000′.

Snowfall intensity has decreased this morning but will increase again throughout the day. Expect anCNFAIC Staff 8-10” above 2000′, with around a foot in favored locations. The NE winds have also decreased this morning but are forecast to pick up again, gusting to 60+mph. Temperatures should remain steady.

CNFAIC Weather Page and the NWS forecast

I will issue the next advisory tomorrow morning at 7am. If you get out in the backcountry we want to know what you are seeing. Please send us your observations using the button at the top of this page or give us a call at 754-2369. Thanks and have a great day.

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Sun, December 11th, 2011
Alpine
Above 2,500'
Considerable (3)
Avalanche risk
Treeline
1,000'-2,500'
Considerable (3)
Avalanche risk
Below Treeline
Below 1,000'
Considerable (3)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
Considerable (3)
Treeline
1,000'-2,500'
Avalanche risk
Considerable (3)
Below Treeline
Below 1,000'
Avalanche risk
Considerable (3)
Danger Scale:
No Rating (0)
Low (1)
Moderate (2)
Considerable (3)
High (4)
Extreme (5)
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Riding Areas
Updated Mon, October 26th, 2020

Status of riding areas across the Chugach NF is managed by the Glacier and Seward Ranger Districts, not avalanche center staff. Riding area information is posted as a public service to our users and updated based on snow depth and snow density to prevent resource damage at trailhead locations. Riding area questions contact: mailroom_r10_chugach@fs.fed.us

Area Status Weather & Riding Conditions
Glacier District
Johnson Pass
Closed
Placer River
Closed
Skookum Drainage
Closed
Turnagain Pass
Closed
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Seward District
Carter Lake
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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.