Fresh wind slabs will be the primary concern today as this storm is expected to move into our area with 55 to 75 mph southeast winds at ridgetop elevations. Winds began to pick up around 4am and by 6am are gusting into the mid 50’s at 3800’. Above about 1200’ we found generally loose, dry snow yesterday that is available for transport by the wind. As winds blow the surface snow around, expect slabs to form on north and west aspects, particularly below ridges. Falling snow at mid and upper elevations will further add to building wind slabs as this storm intensifies through this afternoon and evening.
Cornices will continue to build and fail throughout this storm event. As always, limit your time spent underneath cornices and if travelling on a corniced ridge, when you think you are far enough back from the edge, it’s good practice to move back even further!
Depending on the timing of this storm, precipitation could add up to significant amounts by this afternoon/ evening where storm snow avalanches could be an issue. Yesterday Fitz and I found a couple of concerns on the surface in the form of a sun crust on southerly aspects at and above tree line (formed Tuesday) and very sporadic and pocketed surface hoar. Whether or not the surface hoar stays in tact, I suspect these mid-elevation southerly aspects could be some of the first avalanche producers as storm snow accumulates and forms a slab. If the bulk of precipitation does not come until later in the day or this evening as forecasted, storm snow avalanches will prove more of a concern on Friday.
Temperatures were mild and winds were calm as high clouds dominated our region yesterday in anticipation of our first real shot of moisture in seven days.
Today looks to be a bit more exciting in the weather department as a 956mb low southwest of Kodiak begins to impact our area. Winds have already begun their influence and will continue to blow from the southeast in the 55-75mph range today at upper elevations. The temperature will gradually increase throughout the day with rain being the predominant precipitation type at sea level by this afternoon. The snow line looks to be around 700ft today in the eastern Turnagain Arm area. This storm will start off windy with the bulk of precip coming later this afternoon and overnight.
We will likely continue to feel the effects of this storm tomorrow as it makes landfall and subsequently weakens. For the weekend, cloudy with a chance of precipitation looks to be the story as a series of weak lows progress across our region.
Fitz will issue the next advisory on Friday, March 8th.
|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: email@example.com
|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.