|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|
Observers continue to find the buried persistent weak layers in the snowpack to be reactive and the possibility of triggering a large avalanche remains. One observer yesterday found the January 21st buried surface hoar, described the snowpack they found in Lynx Creek as “spooky” and changed their plan due to concerning snowpit test results. This buried surface hoar layer was also observed to be reactive on Magnum yesterday as well. As snow starts today and hopefully falls throughout the week it will be important to remember the current state of the snowpack. Buried 1-2′ deep are facets sitting on a crust at the mid-elevations and 1-3′ deep is a buried surface hoar/facet combo at the higher elevations. The slab over the weak layers could be very hard if it is in terrain that was affected by the strong winds last week. This was the case in the skier triggered avalanche in Summit Lake a week ago, the mid-elevation faceted layer was under very hard wind-affected snow. Although the heart of Turnagain Pass has the buried weak layers, they are more pronounced and developed on the Southern end of Turnagain Pass and in Summit Lake where the snowpack is shallower. Areas to the North, such as Crow Pass, are also suspect along with those that have not seen much traffic this season. Using safe travel protocols and assessing the consequences if a slab does release is key in choosing terrain. Weak layers like these can become more reactive after even a small additional load. As the snow falls this week keep that in mind and as always be alert for signs of instability.
Wind slabs: Hard wind-affected snow on steep, unsupported slopes may still triggered if you find the wrong spot. Be suspect of very stiff snow over soft snow or hollow sounding snow near upper elevation ridgelines and cross-loaded gullies. If winds really pick up this afternoon pay attention to changing conditions.
Snowpit on Magnum yesterday at 3100′. The January 21st buried surface hoar is easy to spot and still reactive in stability tests.
Cross-loaded gullies on Seattle Ridge
Yesterday was mostly to partly cloudy with some afternoon sunshine peeking through. Temperatures were in the teens to mid 20Fs. Winds were light and variable. Overnight temperatures were in the teens to low 20Fs and winds remained light.
Today will be mostly cloudy with afternoon snow showers. Temperatures will be in the teens to high 20Fs and winds will start off light and increase from the Southeast 10-20 mph gusting into the 30s. Tonight there is snow in the forecast with 2-6″ possible. Temperatures will be a bit cooler in the low 20Fs to mid teens. Winds will continue from the Southeast.
Tomorrow’s forecast has continued snow showers in the morning, clearing in the afternoon and then more snow in the forecast overnight. The next low pressure is lining up for more snow on Thursday but details are uncertain. However, the week ahead looks to be snowy. From the NWS discussion this morning: Despite March and April being the driest months of the year (climatologically), Mother Nature is giving that statistic a run for its money. Fingers crossed!
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||22||0||0||68|
|Summit Lake (1400′)||12||0||0||29|
|Alyeska Mid (1700′)||19||0||0||59|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||20||varible||3||11|
|11/30/20||Turnagain||Observation: Tincan- above treeline||Eric Roberts|
|11/30/20||Turnagain||Observation: Seattle Ridge Flats||Andrew Schauer Forecaster|
|11/29/20||Turnagain||Observation: Sunny Side||Peter Wadsworth|
|11/29/20||Turnagain||Observation: Overflight Recon Turnagain Pass||Silverton Mountain Guides|
|11/29/20||Turnagain||Avalanche: Sunburst||Alexa Dobson|
|11/29/20||Turnagain||Observation: Sunburst||Kathy Still|
|11/28/20||Turnagain||Observation: Tincan trees||Bob Lieberman|
|11/28/20||Turnagain||Observation: Tincan Trees||Tully Ward-Hamer|
|11/28/20||Turnagain||Avalanche: Seattle Ridge Flats||W Wagner Forecaster|
|11/28/20||Turnagain||Observation: Tincan Treeline||Eeva Latosuo|
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.