|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|
Conservative travel is recommended today. The likelihood of triggering a large slab avalanche in steep terrain is increasing. There is weak snow that formed during the long cold, clear period. This is now buried 1-2′ deep and will be even deeper after the storm today. The snow that fell Monday triggered a few small avalanches but was still mostly light, soft and not acting quite acting like a slab. That may all change today. Four to eight inches of snow has fallen since yesterday morning, it is snowing now and there is more snow in the forecast. The temperatures are rising so the snow will be heavier and strong winds starting this afternoon could quickly add weight. Snowpack tests yesterday showed the potential for the buried facets and surface hoar to become reactive with more of a load. As the slab develops over the weak snow avalanches could become large and may even be triggered remotely. Pay attention to both how steep the slopes are that you are traveling on are and what’s above you. When the winds increase this afternoon the potential for natural avalanches and cornice falls will also increase. Look for cracking and collapsing (whumpfs), both signs that the snowpack is unstable and choose terrain very carefully. Don’t be the trigger that tips the balance! The snowfall today will be heavier than yesterday creating an upside-down snowpack. This may act as a slab on it’s own and an avalanche triggered in the upper snowpack may step down to the lower weak layers.
Loose snow avalanches: On steep slopes where the slab hasn’t developed loose snow avalanches (sluffs) both natural and human triggered may occur. There is now both old soft snow and new soft snow that may easily move and be quite pushy. This is another good reason to choose terrain carefully.
Video link HERE.
Yesterday: Skies were mostly cloudy with a quick mid-morning clearing. Light snow started up again in the afternoon with 4-8″ of accumulation. Winds were easterly 5-15 mph with gusts into the 30s. Temperatures ranged from below zero into the low teens with a slow rise during the day. Overnight at most locations temperatures continued to rise into the high teens. Winds were easterly and snowfall continued, favoring Turnagain Pass.
Today: Snow to sea level will continue and may be heavy at times. Portage to Turnagain Pass will be continued to be favored by this system with another 10-15″ in the forecast. Winds will be easterly 10-25 mph with gusts into the 30s. Winds will increase in the afternoon becoming 25-40 mph with gusts into the 60s. A Blizzard Warning in effect from 3pm today until 4 am tomorrow. Temperatures will be in the mid teens to high 20Fs.
Tomorrow: Snow showers are likely with temperatures in the teens. Temperatures will drop back into the single digits by the evening. Winds are forecast to decrease in the early morning but remain easterly.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||11||8||.8||60|
|Summit Lake (1400′)||7||2||.2||18|
|Alyeska Mid (1700′)||11||5||.2||50|
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||11||E||4||15|
|01/24/21||Turnagain||Observation: Triangle bowl||Cooper Street|
|01/23/21||Turnagain||Observation: Seattle Ridge||A Schauer Forecaster|
|01/23/21||Turnagain||Avalanche: Tincan Trees||Matti Silta|
|01/22/21||Turnagain||Observation: JOHNSON PASS||Anonymous|
|01/20/21||Turnagain||Observation: Sunburst||Johnston-Bloom / Roberts Forecaster|
|01/19/21||Turnagain||Avalanche: Cornbiscuit||Schauer/ Johnston-Bloom Forecaster|
|01/19/21||Turnagain||Avalanche: Sunburst and Tincan||CNFAIC Staff|
|01/19/21||Turnagain||Avalanche: Seattle Ridge||CNFAIC Staff|
|01/19/21||Turnagain||Avalanche: Tincan 2900′ SW aspect below Hippy Bowl.||Kris Marshall|
|01/18/21||Turnagain||Observation: Turnagain Pass Road Obs.||A Schauer 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.