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ARCHIVED FORECAST - All forecasts expire after 24 hours from the posting date/time.
Issued
Tue, December 8th, 2015 - 7:00AM
Expires
Wed, December 9th, 2015 - 7:00AM
Forecaster
CNFAIC Staff
Avalanche risk The Bottom Line

A generally  LOW  avalanche danger exists in the mountains surrounding Turnagain Pass. Triggering an avalanche is unlikely but not impossible. The most suspect slopes are in steep terrain at the high elevations where someone just might be able to break off a slab 1-2′ thick.  LOW  danger does not mean no danger. Good travel habits, such as exposing one person at a time, watching your partners, grouping up in safe zones and having an escape route planned are, as always, key ways to minimize risk.

*If venturing into the ‘periphery’ forecast zones, such as Girdwood Valley, Silvertip and Summit Lake areas, more caution is advised due to limited information about the snowpack in these areas.

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Tue, December 8th, 2015
Alpine
Above 2,500'
Low (1)
Avalanche risk
Treeline
1,000'-2,500'
Low (1)
Avalanche risk
Below Treeline
Below 1,000'
Low (1)
Avalanche risk
Alpine
Above 2,500'
Avalanche risk
Low (1)
Treeline
1,000'-2,500'
Avalanche risk
Low (1)
Below Treeline
Below 1,000'
Avalanche risk
Low (1)
Danger Scale:
No Rating (0)
Low (1)
Moderate (2)
Considerable (3)
High (4)
Extreme (5)
Avalanche Problem 1
  • Normal Caution
    Normal Caution
Normal Caution
Normal Caution means triggering an avalanche is unlikely but not impossible.
More info at Avalanche.org

The Turnagain Pass area saw another sunny day with moderate temperatures and no reports of significant instability. An observation from Saturday illustrates the potential for small slabs in steep areas, a typical LOW danger concern. 

As the weather pattern shifts today, bringing showery weather and stronger winds, taking inventory of the surface characteristics is critical to get a picture of what may happen in the days to come as the conditions change. We know that any new precipitation will land on a combination of weak faceted snow and surface hoar that have formed over the past days during the cold clear weather. Underneath these persistent grain types, that could become persistent weak layers, is either a stout rain crust (up to around 2500′) or dense snow that could act as a future bed surface. A forecaster observation from Sunday speaks to what to keep in mind when thinking about near surface facets and surface hoar together. 

***If winds increase today and snow is moved around pay attention to areas that are leeward and may develop small pockets of wind slab on the weak snow/bed surface combination. 

Remember the surface conditions (facets and surface hoar to ridge tops) that may get buried this week.

 

 

 

 

Avalanche Problem 2
  • Persistent Slabs
    Persistent Slabs
Persistent Slabs
Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.
More info at Avalanche.org

We are continuing to track the layer of basal facets from the cold period in early November. For the most part these have been non-reactive. With the potential for additional load in the coming week we will be interested to see if this changes.

Weather
Tue, December 8th, 2015

Today’s weather is forecasted to be a mixture of showery weather in the morning and then mostly to partly cloudy in the afternoon. There is the possibility of snow with up to an inch of accumulation. Temperatures will be in the upper 20Fs to mid 30Fs. Wind will be N-NE, 10-20 mph with gusts in the 30s.

Tomorrow the unsettled weather will continue as the low in the Gulf spins moisture into the region. Cloudy skies, snow showers and warmer temperatures are on tap for the week as the overall pattern shifts.

PRECIPITATION 24-hour data (6am – 6am)

  Temp Avg (F) Snow (in) Water (in) Snow Depth (in)
Center Ridge (1880′) 22    0 0   23  
Summit Lake (1400′) 15    0  0 11  
Alyeska Mid (1700′) 25    0  0 19  

RIDGETOP 24-hour data (6am – 6am)

  Temp Avg (F) Wind Dir Wind Avg (mph) Wind Gust (mph)
Sunburst (3812′) 22    NE 18   38  
Seattle Ridge (2400′)  22  SE 15    38
Observations
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Riding Areas
Updated Tue, April 20th, 2021

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
Open
No parking in turnaround at end of the road near the outhouse.
Placer River
Open
Please do not ride along Railroad tracks. Cross tracks at 90 degree angle and clear the right of way.
Skookum Drainage
Closed
The Skookum Valley is closed to snowmachines. This closure occurs annually on April 1 as per the CNF Forest Plan.
Turnagain Pass
Open
Twentymile
Closed
Seward District
Carter Lake
Open
Lost Lake Trail
Open
Primrose Trail
Open
Resurrection Pass Trail
Closed
Closed for the 2020/21 winter season.
Snug Harbor
Open
South Fork Snow River Corridor
Open
Summit Lake
Open

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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.