Wind slabs formed during Friday, 3/29’s 8-10” of snow were still releasing yesterday. These were in the foot deep category and on all aspects above treeline. A few observed were: one natural that occurred on the east face of Seattle Ridge and one on the southerly tip of Tincan Proper. Check the obs page for a few more details from other observers. The sun and warm temperatures likely played a role in increasing the instability of the slabs.
Today I’m expecting these to be harder to trigger but still the primary concern due to their slab nature. The snowpack is quite variable currently with wind slabs sitting on crusts on south, east and westerly aspects (some of which have facets surrounding them) and on old wind crust/slabs on northerly aspects. Quick hand pits looking for easy shears between snow layers in the top 12-18” of the pack is one good tool to suss out any slab that has yet to heal.
Wet point release and damp point release avalanches should be expected today on south, east and westerly facing slopes approaching 40 degrees and steeper. Watch for rollerballing in the surface snow and be suspect of areas and aspects where the snow surface is warm and gloppy.
Cornices. Warm temperature are known for contributing to the failure of cornices. A good thing to keep in mind when planning your route.
Yesterday’s warmup affected the south, west and easterly aspects as well as below treeline locations. These areas that became damp or wet yesterday are likely undergoing a superficial refreeze now but should moisten through the day. Upper northerly aspects sport variable wind affected, but dry, snow.
It was a WARM day yesterday with temperatures reaching the 40deg mark at sea level and 30F at 3,000′. Skies were partly cloudy with a few flurries (drizzle below 1500′) late in the day. Winds were light from the east (5mph gusting 15mph). The last measurable snowfall was 8-10 € on Friday 3/29.
This morning we are looking at mostly cloudy skies, fog and temperatures around freezing (32F) at 1,000′ and ~20F on the ridgelines. Temperatures should rise to the upper 30’s at 1000′ and upper 20’s at 3,500′. A chance for an inch of snow is on the radar (drizzle below 1000′) as instability showers are over the region. Winds are from the east currently, 10mph gusting ~15mph, and should remain today. I’m hoping the cloud cover will burn off a bit for the CORN HARVEST so cross your fingers.
Monday, and through the early part of this week, it looks as though a high pressure ridge will build over western Alaska. This should bring us light northerly wind and mostly clear skies.
Fitz will issue the next advisory tomorrow morning, April 1st.
|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.