No avalanche activity was seen or reported yesterday. The last known avalanche in our forecast zone was a natural 1-2′ slab Thursday on Raggedtop near Girdwood.
|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|
Although a potent weather system is entering central Alaska from the Bering today, we will be far enough to the south that it looks to just brush us by. Only a trace to 1″ of snow is expected by sunset (8:49pm!) with a chance for 2-4″ tomorrow. The mountains north of Girdwood may see larger amounts this evening through tomorrow (6-12″). Ridgetop winds will be on a slow rise from the south today and may hit averages near 20mph by 6pm and continue rising into tomorrow with averages near 30mph.
Until we receive enough snow/wind to create a new avalanche issue, we remain concerned with old buried weak layers in the top 3′ of the snowpack. These continue to show enough signs of instability that we can’t forget about them. Hence, there is still a chance a person could trigger a persistent slab avalanche. Here are some things to keep in mind:
Wind Slabs: With a bump in winds later today, watch for any snow that might get blown into small shallow wind slabs in the high terrain. With the winds from the south and surface crusts on south aspects, it might be difficult for the wind to pick up much snow. However, terrain channeling can cause winds to shift directions and so be sure to watch for any active loading.
Sluffs: As always, watch your sluff on steep slopes with soft surface snow (shaded aspects today).
Tincan seen from Seattle Ridge yesterday. It’s a bit difficult to see, but there are many recent tracks in the shade while the sunny slopes sport mostly older tracks. It’s that time of year that we are all playing the aspect. 4.2.21.
Snow pit on the east face of Seattle Ridge, just north of Repeat Offender slide path. Pit shows a thin weak layer of buried surface hoar and facets 16″ down that took a lot of force to fail, but when it did it propagated. This means the layer is difficult to trigger but could produce an avalanche if it failed. 4.2.21.
Yesterday: Sunny skies were over the region till around 4pm when high clouds began to filter in ahead of the next weather system. Ridgetop winds were light (5-10mph) from the west and southwest. Temperatures were in the 20’s at the mid elevations and teens in the higher elevations.
Today: Cloud cover overnight has keep valley bottoms in the 20’sF and cloudy skies will remain through the day. Light snowfall may begin this afternoon with 1-2″ of snow possible by Sunday morning. Ridgetop winds will remain southerly and pick up through the day from ~5mph to ~20mph by 6pm with stronger gusts. Temperatures should remain near the 20’sF at the mid elevations and the teens along the ridgelines.
Tomorrow: Light snowfall tomorrow may add another 1-2″ around Turnagain Pass and up to 6″ or more in the mountains north of Girdwood. This storm is favoring areas to the north and up to Hatcher Pass. Ridgetop winds will swing southeast and forecast to increase to 20-30mph. Temperatures will warm slightly but snow should fall close to sea level.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||24||0||0||110|
|Summit Lake (1400′)||20||0||0||49|
|Alyeska Mid (1700′)||24||0||0||116|
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||21||W>N||2||5|
|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|
|04/10/21||Turnagain||Observation: north sides||lance breeding|
|04/09/21||Turnagain||Observation: Girdwood to Turnagain Road Observations||W Wagner Forecaster|
|04/05/21||Turnagain||Avalanche: Resort bowl Seattle creek head wall||Clint Kyffin|
|04/04/21||Turnagain||Observation: Center Ridge||Andy Moderow|
|04/03/21||Turnagain||Observation: Repeat Offender – Seattle Ridge||Troy Tempel|
|04/02/21||Turnagain||Observation: Seattle Ridge||Wagner / Schauer Forecaster|
|04/01/21||Turnagain||Observation: Pete’s||Schauer/ Cullen 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.