|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|
Conditions will still be dangerous today after the surprise storm from yesterday. We received 12-14″ snow by late yesterday morning, and had around 4″ fall last night. Light snowfall is expected to continue to trickle in, bringing another 3 or 4″ throughout the day. Easterly ridgetop winds are expected to continue at 15-25 mph until they start to calm down and switch to the west midday. All of this means the weather machine is hard at work putting a lot of new snow on top of weak, sugary facets. It is likely a human could trigger an avalanche on these weak layers, which could be 2′ deep or deeper, especially on upper-elevation wind loaded slopes.
The weather will be relatively quiet today, but avalanche conditions will still be touchy. The light and fluffy storm snow will start to settle into a more cohesive slab, which might make it easier to trigger a storm slab avalanche today than it was yesterday. Today will be a day to be careful with your route finding, approaching steep terrain with caution. Pay attention to clear warning signs of instability like shooting cracks and fresh avalanche activity, and dial back your terrain accordingly.
Wind Slabs: Some higher elevation slopes will have fresh wind slabs on the surface, which will be extra sensitive. These will most likely be found immediately below ridgelines, convexities, or in gullies. It will be especially easy to trigger an avalanche on these wind loaded features.
Wendy discusses the storm slab problem in this video from Seattle Ridge yesterday:
Glide activity seems to have slowed down in the past few days, but that doesn’t mean the hazard is gone. Glide avalanches are hard to predict, and they involve the entire snowpack so they are large and very dangerous. Be on the lookout for glide cracks, and limit the time you spend traveling below them.
Yesterday: Another 2″ snow fell yesterday morning, with 3-4″ overnight last night. Easterly ridgetop winds were blowing 20-30 mph with gusts as high as 50 mph, but winds were much lighter at mid and lower elevations. High temperatures reached the teens to low 20’s F during the day, and overnight lows were in the single digits F. Skies were mostly cloudy, with the occasional ray of sunshine poking through.
Today: Light snowfall will continue to trickle in, which might amount to another 3-4″ throughout the day. Easterly winds will continue to blow at 10-25 mph, approaching 30 mph at the higher ridgetops. Winds should ease off and switch to blow out of the west late in the afternoon. High temperatures are expected in the low teens, with lows in the single digits.
Tomorrow: Cold air will start to move back into the area tomorrow, with temperatures struggling to get out of the single digits F during the day and dropping below 0 F tomorrow night. Westerly winds should remain light at 5-10 mph, and skies will be mostly cloudy.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||14||N/A*||0.5||N/A*|
|Summit Lake (1400′)||7||tr||tr||11|
|Alyeska Mid (1700′)||12||3*||.1*||N/A*|
*Sensors were not recording for part or all of the day. SWE and Snow totals are estimates.
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||9||E||7||21|
|11/27/21||Turnagain||Avalanche: Seattle Ridge||Schauer/ Wagner/ Predeger Forecaster|
|11/27/21||Turnagain||Avalanche: Eddies||Andy Moderow|
|11/27/21||Turnagain||Observation: Tincan||Hannah Smith|
|11/27/21||Turnagain||Observation: Magnum||Peter Wadsworth|
|11/26/21||Turnagain||Avalanche: Tincan – Bottom of Common Bowl||Matt Dietrick|
|11/26/21||Turnagain||Avalanche: Seattle Ridge||CNFAIC Staff|
|11/26/21||Turnagain||Observation: Sunburst||Sykes / Sass Forecaster|
|11/26/21||Turnagain||Observation: Sunburst||Heather Johnson|
|11/26/21||Turnagain||Observation: Sunny Side||Jessie Janowski|
|11/26/21||Turnagain||Avalanche: Sunny side||Patrick McCormick|
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.