After several days of mostly clear skies and a springtime melt-freeze regime, we have very warm temperatures and cloud cover that has moved in overnight. Ridgetop temperatures are reading between 30 and 32F this morning and cloud cover has likely limited the amount of surface re-freeze. What this means is an increase in wet avalanche potential as daytime warming does not have to soften surface crusts before destabilizing the snowpack. This also is how our springtime “shed cycle” begins; the shed cycle is when we see large natural wet avalanches as the snowpack melts away and sluffs off the mountainsides. Will this week’s warming initiate a true shed cycle? It’s too soon to say, but we need to keep the idea in mind as there is still plenty of snow at the higher elevations that has yet to transition into a summer snowpack. Watching for recent wet avalanche activity throughout the next several weeks should be on our minds.
WET LOOSE AVALANCHES:
If you are headed out today, paying attention to the amount of overnight re-freeze on Southerly aspects will be key. If the snow is unsupportable and saturated – stay off of steep slopes as large wet loose avalanches are possible. On Northerly aspects, watch for the soft settled powder to become damp, or even wet. If this occurs, damp and wet sluffs will be possible on steep Northerly slopes.
Cornices could start calving with the warm temperatures this week. As always, steering clear of these from both above and below is wise. Cornice crevasses are also showing up along ridgelines; this is where the cornice pulls away from the underlying terrain or snow.
Photo below is of a cornice crevasse from the CFR ridge on Tincan this weekend.
Yesterday was yet another inviting and mostly sunny day in the backcountry. Ridgetop winds were light from the East and temperatures warm, near 30F on the ridgelines and mid 40’s F at 1,000′.
Today, we have cloud cover and very WARM air being ushered in as large low pressure system spins in the Gulf. We are too far North of the system for precipitation but we should see overcast skies and season high temperatures in the 34-38F range on the ridgelines. Ridgetop winds are expected to be light to moderate, 10-20mph, from the North and East.
For Monday, intermittent cloud cover, warm temperatures and light precipitation is expected. Accumulations look to be only 1-3″ at the upper elevations with a rain/snow line ~1,500′. Ridgetop winds are expected to be from the North as West as the low-pressure in the Gulf moves off to the Southeast and a wrap-around flow pattern sets up.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||41||0||0||70|
|Summit Lake (1400′)||40||0||0||13|
|Alyeska Mid (1700′)||42||0||0||43|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||32||n/a||11||29|
|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.