|Travel Advice||Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.||Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.||Dangerous avalanche conditions. Careful snowpack evaluation, cautious route-finding, and conservative decision-making essential.||Very dangerous avalanche conditions. Travel in avalanche terrain not recommended.||Extraordinarily dangerous avalanche conditions. Avoid all avalanche terrain.|
|Likelihood of Avalanches||Natural and human-triggered avalanches unlikely.||Natural avalanches unlikely; human-triggered avalanches possible.||Natural avalanches possible; human-triggered avalanches likely.||Natural avalanches likely; human-triggered avalanches very likely.||Natural and human-triggered avalanches certain.|
|Avalanche Size and Distribution||Small avalanches in isolated areas or extreme terrain.||Small avalanches in specific areas; or large avalanches in isolated areas.||Small avalanches in many areas; or large avalanches in specific areas; or very large avalanches in isolated areas.||Large avalanches in many areas; or very large avalanches in specific areas.||Very large avalanches in many areas.|
A slab 12-20” thick is sitting on a fragile layer of buried surface hoar. This persistent weak layer is widespread and has been found on all aspect above treeline throughout Turnagain Pass and Summit Lake. Over fifteen human triggered avalanches were reported throughout the weekend and three more occurred yesterday on Tincan. Luckily no one has been buried or injured. Click HERE for more details on these observations.
Note worthy things to keep in mind today:
Although many of these avalanches have been relatively small, don’t forget that BIGGER SLOPES WILL HAVE BIGGER CONSIQUENCES! As we move away from the weather events that caused this scary set-up, remember this type of avalanche problem will be slow to heal. The next few days of clear weather are going to be tough to resist the temptation to get into bigger terrain. Avoid high consequence terrain and keep your slope angles low. Cautious route-finding and conservative decision-making will be necessary!
This small avalanche was triggered remotely by two skiers putting in a skin track at 2200′ on a North aspect on Tincan yesterday.
Natural avalanche activity on the West face and South face of Lipps, as seen yesterday (Nov. 21) from the Johnson Pass Trailhead.
Yesterday skies were partly cloudy following a storm that left 5 € of new snow in Turnagain Pass and brought moderate Easterly winds with gust into the 40’s mph. By mid afternoon ridgetop winds began to decrease into the teens mph. Rain/snow line briefly reached 1200′ yesterday morning, but temperatures cooled as skies cleared late morning. In the upper elevations temperatures averaged in the mid 20Fs.
Overnight winds were light from the East. Temperatures were in the mid to low 20’s F with a slight inversion causing ridgetop temperatures to be warmer than at road level. No precipitation was recorded.
Today skies are expected to be mostly clear with light winds from the East. Daytime temperatures will be in the high 20s F and no precipitation is expected today. This pattern is expected to last through Thanksgiving day with our next chance for snow showers near the end of the week.
|Temp Avg (F)||Snow (in)||Water (in)||Snow Depth (in)|
|Center Ridge (1880′)||28||0||0||21|
|Summit Lake (1400′)||26||0||0||2|
|Alyeska Mid (1700′)||31||0||0||4|
|Temp Avg (F)||Wind Dir||Wind Avg (mph)||Wind Gust (mph)|
|Seattle Ridge (2400′)||26||n/a||n/a||n/a|
|11/27/23||Turnagain||Avalanche: Tincan Ridge||Schauer/ Stiassny Forecaster|
|11/26/23||Turnagain||Observation: Road report: Slide with dirt on Repeat offender||Anonymous|
|11/26/23||Turnagain||Observation: Pete’s North||Ben Sullender|
|11/25/23||Turnagain||Observation: Tincan trees||John Sykes Forecaster|
|11/21/23||Observation: Spokane Creek||John Sykes Forecaster|
|11/19/23||Turnagain||Observation: Magnum – PMS Bowl||Schauer/ Cullen/ Jonas Forecaster|
|11/19/23||Other Regions||Observation: Sunnyside/Penguin||Jose Ramos-Leon|
|11/19/23||Turnagain||Observation: Eddies||Andy Moderow|