A series of storms beginning in mid March gradually built up slabs that are now 2-3’ thick. Those slabs sit on a wide array of underlying surfaces, the most concerning of those being weak faceted snow. The most likely places to find this combo of dense slabs sitting on weak layers are slopes with any North facing component. The challenging part to understanding this problem lies in the variability of the underlying weak layer. On certain slopes it is widespread and on other slopes it is non existent. As a result it will be possible to travel on one slope without incident and move onto an adjacent slope and trigger a wide propagating avalanche 2-3’ deep.
Large avalanches released this past week in this type of terrain. Assessment of this problem is difficult. As such, it will be important to pick terrain that allows for a quick exit. Traveling on big sustained slopes on the Northern half of the compass is essentially a roll of the dice for now. Remember that tracks are not an indicator of stable snow.
An example of the setup that is most suspect. ~3 foot slab sitting on weak snow. Difficult to trigger but high consequences remain. This setup exists on many steep north facing slopes thoughout the forecast zone.
On steep sunlit slopes expect shallow wet loose activity today. We are a few days into a consistent melt freeze regime with solid freezing at night and gradual warming of the snow surface throughout the day. Timing is everything – there will be a window of time where riding conditions will be great, with only an inch or two of soft wet snow. As that melting gets deeper into the snowpack it is time to dial back your slope angles. Wet loose avalanches have the potential to carry or injure a person in large channeled terrain.
Cornices grew substantially over the last several weeks. Cornices are looming over many starting zones and along ridgelines. Always steer clear of cornices while traveling along ridges; identify where the cornice begins and the underlying terrain ends. When traveling below cornices pick routes that keep time spent in the line of fire at a minimum.
A large cornice looms above South facing terrain in Goldpan. photo: Fitzgerald
Yesterday saw warm temperatures under clear skies. Winds were generally light and no new precipitation was recorded.
Today expect sunny skies, warming temperatures throughout the day and calm winds, as a ridge of high pressure sits over the area. Temps will reach into the low 40s F at 1,000′ and winds will be out of the Southeast at 5-10 mph.
Tomorrow we can expect cloudy conditions with a chance for some light showers as active weather in the Bering helps to break down the aforementioned ridge. Active weather will continue into the early part of next week with a greater chance for accumulating precipitation coming on Monday.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||34||0||0||59|
|Summit Lake (1400′)||31||0||0||10|
|Alyeska Mid (1700′)||34||0||0||32|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||28||n/a||6||18|
|04/19/21||Turnagain||Avalanche: Triangle, Seattle creek||Will Morrison|
|04/18/21||Turnagain||Avalanche: Turnagain Pass Road Obs||Andy Moderow|
|04/18/21||Turnagain||Observation: Seattle Ridge, approximately 300 yards south of the up track||Brent Byrne|
|04/17/21||Turnagain||Avalanche: Road obs||Johnston-Bloom / Moderow Forecaster|
|04/16/21||Turnagain||Avalanche: Seattle Ridge||Wendy Wagner Forecaster|
|04/16/21||Turnagain||Avalanche: Turnagain Pass, non-motorized side seen from Seattle Ridge||CNFAIC Staff Forecaster|
|04/16/21||Turnagain||Observation: Sunburst||Lance breeding|
|04/15/21||Turnagain||Observation: Tincan||Schauer/ Rothman Forecaster|
|04/13/21||Turnagain||Observation: Turnagain Pass Road Obs||A Schauer Forecaster|
|04/12/21||Turnagain||Observation: Tincan||Johnston-Bloom / Latosuo Forecaster|
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: email@example.com
|Area||Status||Weather & Riding Conditions|
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.