It’s that time of year! The sun is out and affecting the snow in terrain on the Southern half of the compass. With 4-8″ of loose snow on the surface over a dense base, watch your sluffs and watch how the sun is affecting the snow around you.
Wind Slabs? There is a slight chance winds could bump up enough to form soft shallow slabs on leeward slopes. Although the main flow will be Northwesterly, loading Southeasterly aspects, this pattern also creates a Southerly flow along the East side of Turnagain Pass which loads North aspects (such as Sunburst and Tincan).
With February already here along with a high pressure stint bringing sunshine, it may be easy to forget many areas in Southcentral have a poor snowpack structure. As mentioned in the bottom line above, weak snow near the base of the pack exists on slopes with a thinner snow cover. The heart of Turnagain Pass has drawn the lucky ticket and the pack is deeper and stronger with avalanche concerns focused on surface instabilities (sluffs and shallow fresh wind slabs).
If deciding to venture to the periphery zones, watch for recent avalanche activity, listen for whumphing (collapsing of the snowpack) and cracks that shoot out from your snowmaching, skis or snowboard. There also can be no warning signs before an avalanche is triggered. This type of avalanche is often triggered in a thin spot, near rocks or on the edge of the slab. These can also be triggered by large groups and/or snowmachines on, near or under slopes. Again it will be critical to maintain safe travel protocol, again as mentioned above.
Cornice falls are possible with warm temperatures and sunshine. These could release naturally and be near the tipping point that person breaks them off easily. Keep a wide berth when on ridgelines and limit time underneath.
Photo: Cornice fall yesterday in Warmup Bowl in the Seattle Creek drainage. Triggered from a person on the ridge later in the day.
It was a brilliant sunny day in the mountains yesterday with little to no wind at all elevations! Temperatures were cool (~10-15F) in valley bottoms and warmer (20-30F) on the ridgelines.
Today will be much of the same with two slight changes, but first, bring your dark lenses as the sun will be intense. 1) Ridgetop winds have just bumped up slightly this morning and could be breezy for the day (5-15mph from the North and West, gusting 10-20mph). Temperatures have climbed overnight at the high elevations and sit around 32F – valley bottoms have decreased and sit in the single digits… Another blocking high-pressure and associated stout inversion is settling in…
These conditions are expected to persist all the way through the weekend and into Monday. There’s no hint of a storm cycle in the foreseeable future, but we could get some flurries the middle part of next week.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||19||0||0||55|
|Summit Lake (1400′)||10||0||0||24|
|Alyeska Mid (1700′)||21||0||0||49|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||24||NE||3||10|
|01/17/20||Turnagain||Observation: Tincan||Allen Dahl|
|01/16/20||Turnagain||Observation: Lynx Creek||Wagner / Van Luit Forecaster|
|01/13/20||Turnagain||Observation: Tincan||Ryan Van Luit Forecaster|
|01/12/20||Turnagain||Observation: Magnum West face||Levi Oyster|
|01/10/20||Turnagain||Observation: Cornbiscuit||Allen Dahl|
|01/09/20||Turnagain||Avalanche: Seattle Ridge, Minus 3 Bowl||J Davis|
|01/09/20||Turnagain||Observation: Goldpan||Billy Finley|
|01/09/20||Turnagain||Observation: Treeline on Magnum and Sunburst||Alaska Avalanche School Pro 1|
|01/08/20||Turnagain||Avalanche: Seattle Ridge||Matti Silta|
|01/07/20||Turnagain||Observation: Eddies||Allen Dahl|
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.