Storm snow from Dec. 13/14th continued its settling process as relatively warmer temperatures (above 0 F) today will promote bonding, allowing more of a consistent or interconnected slab across a given slope. It is unclear still if warmer temps today will do much to affix last weekend’s storm snow to our December drizzle crust from 12/7. We have had several reports of small, skier triggered soft slabs running on this crust over the last few days.
The crust is easy to find as it proves supportable to a skier and is widespread throughout the Turnagain zone. Given time it will continue to break down and become absorbed into our mid-winter snowpack but right now we are paying particular attention to how any new load of snow will react on this bed surface. Continue to pay attention to steeper, rocky terrain or convex rollovers where you may pull out a soft slab pocket today.
Moreover let’s not lose site of what lies below. The lower half of our snowpack consists of very weak, faceted snow. I suspect a big enough trigger such as a snowmachine may be able to penetrate this rotten layer and produce an avalanche.
Our surface still consists of low density, loose snow that is ripe for wind transport with the coming storm (see mountain weather below). New surface hoar has also formed over the last couple of cold and clear nights to cap our snowpack. If winds pick up early enough in the day today, we could see wind slabs forming below ridges and on cross-loaded slopes prior to nightfall.
Yesterday temperatures were stubborn to break single digits. Winds were generally light form the north and northwest allowing valley fog to stay in place for much of the day in low lying areas while anyone in the upper elevations was rewarded with clear skies and a very low (on the horizon) sun.
Expect today to be a day of transition as mid and high level clouds move in to our area ushering in the arrival of what looks to be a quick, yet potent blast of winter weather. A strengthening low-pressure system to our south will arrive this afternoon/ evening packing SE winds and ample snow. There is a Blizzard Warning in effect for 6PM this evening. The peak intensity of this storm looks to hit the eastern Turnagain Arm region overnight and if the system lines up favorably, we could wake up tomorrow with 12-18 € of new snow. The exact track of this low will play a big role in wind direction and specifically what areas are favored with snowfall, but in short precip will be in the form of snow across our region and winds will be moderate to strong overnight, creating those blizzard conditions.
|04/19/21||Turnagain||Avalanche: Triangle, Seattle creek||Will Morrison|
|04/18/21||Turnagain||Avalanche: Turnagain Pass Road Obs||Andy Moderow|
|04/18/21||Turnagain||Observation: Seattle Ridge, approximately 300 yards south of the up track||Brent Byrne|
|04/17/21||Turnagain||Avalanche: Road obs||Johnston-Bloom / Moderow Forecaster|
|04/16/21||Turnagain||Avalanche: Seattle Ridge||Wendy Wagner Forecaster|
|04/16/21||Turnagain||Avalanche: Turnagain Pass, non-motorized side seen from Seattle Ridge||CNFAIC Staff Forecaster|
|04/16/21||Turnagain||Observation: Sunburst||Lance breeding|
|04/15/21||Turnagain||Observation: Tincan||Schauer/ Rothman Forecaster|
|04/13/21||Turnagain||Observation: Turnagain Pass Road Obs||A Schauer Forecaster|
|04/12/21||Turnagain||Observation: Tincan||Johnston-Bloom / Latosuo 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.