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ARCHIVED - Forecasts expire after 24 hours.
Issued
Thu, April 21st, 2011 - 7:00AM
Expires
Fri, April 22nd, 2011 - 7:00AM
Forecaster
Wendy Wagner
Avalanche risk The Bottom Line

Good morning backcountry travelers. This is Wendy Wagner with the Chugach National Forest Avalanche Information Center on Thursday, April 21th at 11am. We are no longer issuing daily avalanche advisories for 2010-2011 season however, this does not mean that the avalanche season is finished. See below for an update for the Turnagain Arm area (this does not apply to highways, railroads, or operating ski areas).

ANNOUNCEMENTS

Outside advisory area:

Our deepest condolences go out to the family and friends of Dale Brabec who was killed while sledding on his saucer in the Bird Ridge area between Anchorage and Girdwood. Details are being compiled by the Alaska Mountain Rescue Group and will be posted as they become available.

AVALANCHE UPDATE

The “shed cycle”, meaning the big spring thaw when many slopes shed their snow, is close to arriving. Several medium, and a few large, wet loose and wet slab avalanches have begun to release naturally. In particular, these have been seen on east facing slopes both on Seattle Ridge in Turnagain Pass and Raggedtop in the Girdwood Valley.

Wet snow avalanche concerns

The most dangerous avalanche conditions in the Turnagain Arm area remain the shedding of wet snow on east, south and west facing slopes. Human triggered avalanches are likely and natural avalanches are possible on these slopes. Wet avalanches entrain very dense and heavy snow and are hard to escape from. They can push you into trees, over cliffs and into gullies. The KEY clue to watch for is when springtime snow becomes soft and slushy enough that your boot penetrates ankle deep. This is often in the afternoon as the snow warms through the day, however can be any time of day if temperatures are too warm for the snow to refreeze overnight. Steer clear of any slopes with wet soft snow.

Dry snow and new snow/rain concerns:

New snow and rain are on tap for the end of the week through the weekend. By the weekend the rain/snow like looks to increase to 2000′ and possibly higher. Winds currently look to be moderate and increase from the east over the weekend. As with any new snow, keep an eye out for recent avalanches as well as cracking and collapsing. Human triggered soft slab and wind slab avalanches will be possible in areas receiving over a few new inches. The minute the sun pokes out and hits the new snow wet loose natural and human triggered avalanches will be likely. Remember, avalanche danger is highest during and within 24 hours after the storm, after which it will begin to decrease. If the rain line increases to over 2000′ wet snow avalanches will be likely. These can be on all aspects and could be large depending on the amount of rain that falls.

GENERAL AVALANCHE DISCUSSION

There are still plenty of weak layers out there including: pockets of buried surface hoar, facets around sun crusts and facets surrounding the Thanksgiving rain crust.

Avalanches on these weak layers are possible, especially:

-during storms

-within 24 hours after storms

-during rain on snow events

-during the big spring thaw

-during times of direct sunlight

-rapidly warming temperatures

**Every year there is a time when the snowpack completely falls apart due to the spring thaw. This can happen any time in the next couple weeks. Often, this extremely dangerous avalanche cycle starts after 2-3 days of sustained above freezing temperatures at the ridge top weather stations (including overnight), during periods of direct sun or intense rainfall. When the spring thaw happens, we all need to stay away from the mountains until the cycle is finished. Large destructive avalanches that could fail on deeper weak layers are common during this time.

WEATHER ROUNDUP

The place for all things weather is the CNFAIC weather page!

GENERAL ANNOUNCEMENT

We would like to thank all of you for staying safe in avalanche terrain and helping make this avalanche center an important resource for South Central Alaska and the Kenai Peninsula.

A HUGE THANK YOU goes out to everyone that submitted observations this year. Your observations are invaluable to us, as well as help steer this operation in the right direction.

We’d also like to thank the Friends of the Chugach National Forest Avalanche Information Center and our major funding partners. You are an amazing group of folks with a passion to help keep people safe in the backcountry. THANK YOU for all your support.

Additionally, we would like to thank:

-Alyeska Ski Patrol

-Alaska DOT

-Alaska Railroad

-Alaska Avalanche School

-Alaska Pacific University

-Chugach Powder Guides

-and many CNFAIC Staffs

for sharing important avalanche information to pass on to the backcountry community.

Remember – Stay tuned for periodic updates through April 30th.

Thanks for checking the avalanche advisories this season. Have a great spring and summer!

Thu, April 21st, 2011
Alpine
Above 2,500'
0 - No Rating
Avalanche risk
Treeline
1,000'-2,500'
0 - No Rating
Avalanche risk
Below Treeline
Below 1,000'
0 - No Rating
Avalanche risk
0 - No Rating
1 - Low
2 - Moderate
3 - Considerable
4 - High
5 - Extreme
Avalanche risk Avalanche risk Avalanche risk Avalanche risk Avalanche risk
Travel Advice Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features. Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern. Dangerous avalanche conditions. Dangerous avalanche conditions. Very dangerous avalanche conditions. Travel in avalanche terrain not recommended. Extraordinarily dangerous avalanche conditions. Avoid all avalanche terrain.
Likelihood of Avalanches Natural and human-triggered avalanches unlikely. Natural avalanches unlikely; human-triggered avalanches possible. Natural avalanches possible; human-triggered avalanches likely. Natural avalanches likely; human-triggered avalanches very likely. Natural and human-triggered avalanches certain.
Avalanche Size and Distribution Small avalanches in isolated areas or extreme terrain. Small avalanches in specific areas; or large avalanches in isolated areas. Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas. Large avalanches in many areas; or very large avalanches in specific areas. Very large avalanches in many areas.
Observations
Recent Observations for Turnagain Pass
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11/16/23 Turnagain Observation: Tincan Common
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11/14/23 Turnagain Observation: Seattle Ridge
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11/12/23 Turnagain Avalanche: Goldpan – avalanche
11/11/23 Turnagain Observation: Tincan Common
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11/10/23 Turnagain Observation: Tincan
11/10/23 Turnagain Observation: Tincan Trees
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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.