|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.
It has been over a week since the last observed avalanche activity within our advisory area. However, yesterday was the second day in a row that somebody sent us a photo of a very large avalanche just outside our zone. This one occurred at the back of the Twentymile drainage and was visible from the Seward Highway.
|Size (D scale)
|Unlikely to bury a person
|Can bury a person
|Can destroy a house
|4 & 5
|Can destroy part or all of a village
As this quiet stretch of weather continues, our main avalanche concern is the continued glide avalanche activity we’ve seen throughout the advisory area, all the way from Girdwood to Seward. We received multiple observations yesterday with people finding new glide cracks in surprising locations on Magnum, Cornbiscuit, Lipps, and Seattle Ridge. We’re continuing to see the alarming trend of glide cracks opening up and occasionally releasing in high-traffic areas, and that will continue to be a threat for now.
These avalanches can be easy to avoid if you are able to identify an active glide crack. We’ve received multiple recent reports of people being caught by surprise with fresh cracks opening up, so be sure to look carefully, and be aware that a slope you might have traveled safely on just a few days ago might be creeping down the side of the mountain today. Avoid spending time under glide cracks whenever possible, and consider alternate routes if your typical trail is exposed. If you can’t pick a better way through the terrain, travel quickly when you have to traverse under a glide crack and only expose one person at a time to the overhead hazard.
Yesterday: Skies were mostly cloudy with increasing cloud cover through the day. Some areas saw some light snowfall with no accumulation. Winds were light out of the northeast around 5 mph. High temperatures were in the single digits to low teens F, with lows in the single digits above and below 0 F.
Today: Skies should clear as winds switch back to the west/northwest today, although we might see some lingering valley clouds. Winds should stay light at around 5 mph with the exception of the Seward area which will likely see northwest winds around 15-25 mph. Temperatures will stay cold in the single digits F during the day today, dropping to the single digits below 0 F tonight. No precipitation is expected.
Tomorrow: Cold and clear weather continues tomorrow, with light northwesterly winds around 5-10 mph. Temperatures are expected to be in the single digits to low teens F during the day, dropping back into the low single digits F overnight. No precipitation is expected.
PRECIPITATION 24-hour data (6am – 6am)
|Temp Avg (F)
|Snow Depth (in)
|Center Ridge (1880′)
|Summit Lake (1400′)
|Alyeska Mid (1700′)
|Bear Valley – Portage (132′)
|Grouse Ck – Seward (700′)
RIDGETOP 24-hour data (6am – 6am)
|Temp Avg (F)
|Wind Avg (mph)
|Wind Gust (mph)
|Seattle Ridge (2400′)
|Observation: TinCan Backdoor/ Center Ridge
|AAS L1 Turnagain
|Avalanche: Lynx Creek
|Observation: Turnagain, Seattle, Mt Ascension
|Silverton Mountain Guides
|Observation: Tincan Trees
|Dalpes/Thamm/ Schauer Forecaster
|Observation: Seward Highway across from Johnson Pass TH
|Avalanche: Base of Seattle Ridge
|Troy Tempel, Thomas Lees, .Josh Bollaert, Damian Naquin
|Observation: Lynx creek
|Observation: Tincan Trees
|Moderow / Clayton