|Signal Word||Size (D scale)||Simple Descriptor|
|Small||1||Unlikely to bury a person|
|Large||2||Can bury a person|
|Very Large||3||Can destroy a house|
|Historic||4 & 5||Can destroy part or all of a village|
With clearing skies and light winds, travel into the upper elevation terrain will be appealing today. While there is plenty of soft snow to enjoy it will important to pay attention to and look for past wind-loading. This might take a bit of investigation due to the few inches of snow that fell Tuesday night without wind. The goal is to avoid steep slopes with the prior loading. There is a weak layer of snow (surface hoar and near surface facets) that formed early last week that was subsequently buried by the snow that fell at the end of the week. After the snow there was wind from both the east and the west which formed wind slabs over the weak layer on different aspects. Over the weekend there were human triggered wind slab avalanches and a couple of natural avalanches in Summit Lake on Monday. As time has passed since the wind-loading and because of the type of weak layer, we are now dealing with a persistent slab issue. The most suspect areas are loaded slopes at higher elevations. Keep in mind that the amount of snow that fell was also really variable across the forecast area. As you choose where is go today it will be important to determine whether the wind formed a slab of stiffer snow above the weak layer or not and how deep the slab is. As you travel is the snow loose and sugary or stiff and supportable? Do you sink into soft snow on your skis or snowmachine or not? Be on the lookout for signs of instability like cracking, whumpfing. Also know that signs of instability may not be present even though avalanche danger lingers when you are dealing with a persistent weak layer in the snowpack. Slab or no slab? That is the question to answer as you travel today!
Loose snow avalanches (sluffs): Sluffs are likely to be high volume and fast running. They could entrain the few inches of new snow as well as the faceted snow that sits below it. These could have serious consequences if they carry you into terrain traps like cliffs, trees, or rocks.
Cornices: Large cornices are peeling away from ridgelines and cracks are opening. Be sure to give them plenty of space along the ridge and minimize the amount of time you spend below them.
Glide cracks exist across the forecast area. Remember it is important to limit time spent underneath them. Glide avalanches are totally unpredictable, not triggered by people and are the entire snowpack sliding at the ground. This type of avalanche could be large and unsurvivable if you happened to be in wrong place when one releases. If you see recent glide activity please let us know.
Yesterday: Skies were mostly cloudy in the morning becoming partly cloudy in the afternoon with areas valley fog. Winds were light and westerly and temperatures were in the teens to mid 20°Fs. Overnight skies were partly cloudy, winds were calm and temperatures were in the single digits to mid teens.
Today: Skies will be partly cloudy becoming mostly sunny in the afternoon with some continued valley fog. Winds will be light and northwesterly and temperatures will be in the teens to mid 20°Fs. Overnight skies will be partly cloudy with calm winds and temperatures in the single digits to low teens.
Tomorrow: Skies will be mostly cloudy with a chance of snow showers in the afternoon and evening. Temperatures will be in the 20°Fs and winds will be light and easterly. Looking ahead to the weekend the clouds will move out on Saturday with some sunshine in the forecast for afternoon and on Sunday.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||14||0||0||121|
|Summit Lake (1400′)||12||0||0||45|
|Alyeska Mid (1700′)||13||0||0||107|
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||16||VAR||2||8|
|02/25/21||Turnagain||Observation: Seattle flats, above power line||Carly AAS Level 1|
|02/25/21||Turnagain||Avalanche: Cornbiscuit North face||CNFAIC Staff Forecaster|
|02/25/21||Turnagain||Avalanche: Tincan Proper||CNFAIC Staff Forecaster|
|02/25/21||Turnagain||Avalanche: Johnson Pass area||W Wagner Forecaster|
|02/24/21||Turnagain||Observation: Eddies||Johnston-Bloom / Roberts Forecaster|
|02/23/21||Turnagain||Observation: Silvertip||Nancy Pfeiffer|
|02/22/21||Turnagain||Observation: Magnum||Schauer/ Latosuo Forecaster|
|02/21/21||Turnagain||Avalanche: 3400′ SW Eddies ridge||Peter Ostroski|
|02/20/21||Turnagain||Observation: Shark’s Fin||Schauer/ Jonas Forecaster|
|02/17/21||Turnagain||Observation: Sunburst||Johnston-Bloom / Roberts 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: firstname.lastname@example.org
|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.