“Even though avalanche conditions are low right now, doesn’t mean they can’t happen. ” Words of wisdom from a snowmachiner who triggered a wind slab on a SE aspect of Seattle Ridge, near God’s Country yesterday. While side-hilling a steep wind loaded feature a slow moving slab broke about 15’ above just after the rider cleared the slide path. The crown was estimated between 12-18” deep and hard chunks of debris came to stop on the gentler slope below. This avalanche happened around 12:30pm on an aspect susceptible to solar warming. Although there were no reports of wet loose avalanches or roller ball activity, Southerly surfaces were warming up yesterday. Even subtle surface warming can make wind slabs more susceptible to triggering. Steeper slope angles and slopes with rocks exposed will be most suspect. Light winds today are expected to keep surfaces cooler, but pay attention for damp surface snow. Soft snow still sits on many slopes and roller balls could occur in these areas and a there is chance of shallow wet loose avalanche activity. Things to keep in mind if you are headed to the mountains to enjoy these long sunny days:
Wind Slabs: Old and hard winds slabs are easy to find but for the most part they are locked into place. Be suspect of smooth pillowed snow on steep features or in rocky areas, where they are not supported from below. Solar warming could make it easier for someone to pop one out.
Loose Snow Avalanches (Sluffs): Watch your sluff. Dry sluffs on steep slopes are probable and have been fast moving this week. And, as mentioned above, wet loose (or damp) sluffs, both natural and human triggered, may occur.
Glide Avalanches: Glide cracks continue to slowly open above popular terrain on Seattle Ridge and in other areas of the advisory area. These could release at any time, watch for these cracks and avoid being under them.
Cornices: Cornices may start to loosen with the warming – as always, give these monsters a wide berth from above and limit exposure time traveling underneath.
Persistent Slabs and Deep Slabs: There are various weak layers in our thin snowpack. Buried surface hoar sits 1-3+’ below the surface and faceted snow sits in the mid and base of the pack. These weak layers with varying degrees of strength are in a dormant stage due to plenty of time to adjust with a lack of changing weather. Although this means the layers are not producing avalanches, it doesn’t mean an outlier can’t occur which could cause a large avalanche breaking deeper in the pack.
The rider reported being just below the trees on the left side of the photo when the avalanche released. No one was caught. Photo by Brian Bird
A view of the slide from the Seward Hwy on a SE aspect of Seattle Ridge near God’s Country.
Yesterday skies were clear and sunny. Temperatures averaging in the teens F increased into the low 20F’s mid day in the alpine. At lower elevations there were a few hours where temperature reached 30F at Center Ridge weather station. Winds were light and variable. Overnight temperatures dropped back into the low teens F.
Today a similar pattern is expected. Temperatures in the teens F may reach the mid 20F’s by mid day. Winds are expected to be calm in the morning increasing to 5-15mph from the North by early afternoon. This evening North winds may bump into the 15-25mph range.
A high pressure over mainland Alaska will continue to dominate our weather this coming week. There is a chance of cloud cover and light flurries as early as Wednesday, but nothing to get too excited about at this time.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||15||0||0||60|
|Summit Lake (1400′)||11||0||0||28|
|Alyeska Mid (1700′)||19||0||0||56|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||16||var.||3||13|
|05/06/20||Turnagain||Avalanche: Pastoral Peak, north face||Andy Duenow|
|04/10/20||Turnagain||Avalanche: Wolverine||Mike Records|
|04/10/20||Turnagain||Observation: Eddies lookers right shoulder||Matt Yoder|
|04/09/20||Turnagain||Observation: Bench Peak||Mike Records|
|04/04/20||Turnagain||Observation: Pete’s North||Anonymous|
|03/26/20||Turnagain||Avalanche: Tincan – Proper (SW facing)||CNFAIC Staff|
|03/26/20||Turnagain||Avalanche: Seattle Ridge||W Wagner Forecaster|
|03/25/20||Turnagain||Avalanche: Sunburst Uptrack @ 2000′||J. Boisvert|
|03/24/20||Turnagain||Observation: Turnagain – Road Observations||W Wagner 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.