|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|
Today’s advisory is going to start with a little good news/bad news. The bad news first- it looks like it is going to rain all the way up to ridgetops today. The good news? Although freezing rain may do some serious damage to riding and skiing conditions, we are not expecting enough water to increase the avalanche danger. The mountains around Girdwood are expected to get 0.25″ water, while Turnagain Pass receives closer to 0.1″.
Our primary avalanche concern is the lingering possibility of triggering a large avalanche on weak, faceted snow buried 2-5′ deep. This layer is showing signs of gaining strength, but still should be approached with caution. The most likely places to trigger an avalanche on a deep persistent weak layer will be areas with a thinner snowpack. We’ve noticed a trend of lower snow depths towards the south end of Turnagain pass down to the Summit Lake area, making these zones the most suspect. While slightly less likely, you may also be able to trigger something big if you find a thin spot on a slope in the northern half of the advisory area too. These monsters are notoriously difficult to predict due in part to their lack of direct feedback prior to avalanching. This means our typical warning signs like shooting cracks, collapsing, and poor stability test results rarely show up when dealing with our current setup, despite potentially dangerous conditions. For now we are still avoiding big, steep slopes just because the consequences of triggering an avalanche on this deep persistent weak layer are too severe. This layer is slowly moving in the right direction, but it still needs time to heal before it should be trusted.
Loose Wet Avalanches: With today’s rain we may see some loose wet avalanches on steep slopes that have remained sheltered from this week’s wind events. These will be most likely at and below treeline. A loose wet avalanche occurring above 1500′ has the potential to trigger a larger avalanche on the deep persistent weak layers mentioned above.
Two graphics from the National Weather Service Anchorage office that we were not thrilled about seeing. Precip totals around 0.1″-0.25″ with warm temperatures mean we are expecting to see some rain today. Courtesy of NWS, 12.25.2021.
Yesterday: High temperatures were in the mid 20’s to low 30’s F under mostly cloudy skies. Winds were blowing 5-10 mph out of the south near Girdwood, the east on Seattle Ridge, and the west on Sunburst with no precipitation.
Today: Temperatures have been warming in the early morning and will continue to do so through the day. Weather stations are showing temps in the upper 20’s to low 30’s F as of 6:00 a.m., which are expected to rise into the mid to upper 30’s F. The Girdwood area may see around 0.25-0.3″ rain, while Turnagain Pass and Summit Lakes are expected to see closer to 0.1″. Rain level is expected to make it up to 7000′ during the day. Winds will be 5-10 mph out of the north near Girdwood, and out of the south at Turnagain Pass. Stronger southwesterly winds are expected around 15-20 mph with gusts of 40-50 mph near Summit Lakes.
Tomorrow: Temperatures are expected to drop just below freezing overnight before rising back into the mid 30’s F tomorrow. Cloud cover will break up slightly during the day. Westerly winds will blow 10-20 mph with gusts around 25 mph. No precipitation is expected tomorrow.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||26||0||0||68|
|Summit Lake (1400′)||20||0||0||22*|
|Alyeska Mid (1700′)||25||0||0||41|
*Estimate. Snow depth sensor currently not reporting.
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||23||E||4||13|
|11/28/22||Turnagain||Observation: Pastoral||Schauer/ Wadsworth Forecaster|
|11/26/22||Turnagain||Observation: Eddies||Schauer/ Cullen Forecaster|
|11/26/22||Turnagain||Observation: Eddies||Andy Moderow|
|11/26/22||Turnagain||Observation: Lipps||Big Ripper|
|11/25/22||Turnagain||Observation: Sunburst||Hannah Smith|
|11/25/22||Turnagain||Observation: Sunnyside / Seattle Ridge||Matti Silta|
|11/25/22||Turnagain||Observation: Sunburst||John Sykes|
|11/25/22||Turnagain||Observation: Tincan Trees||Andy Moderow|
|11/25/22||Turnagain||Observation: Tincan||Galen Hecht|
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.