|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.
The top 2 feet of our snowpack is where the issues can be found. Depending on aspect the sun has had significant effect to most slopes – either directly on the surface or by creating a series of now buried crusts.
In general, the better snow can be found on non-south aspects that get less sun exposure. Watch out for shallow slabs like the ones that we’ve been seeing recently. Check out the observations page for some examples of what to look out for.
The avalanches we’ve been seeing have followed a consistent pattern. Size has been low volume, but they run surprisingly far for the amount of snow involved. Most aspects are affected, with south having more of a crust/facet issue and north having more of a wind slab issue.
Picture is from last weekend on the south face of Sunburst.
Shaded slopes still hold dry snow at higher elevations. Those areas are prone to loose snow sluffing by skier initiation. Just like the slab problem, the volume is relatively small but they can still travel good distances.
Wet avalanche problems will start soon. The current pattern of cold overnight temperatures has kept it from becoming an issue, but it’s only a matter of time. As always this time of year – think about heat induced avalanche activity in the afternoon when the surface crust melts and the snowpack loses strength.
Our stretch of sunny weather continues with freezing temperatures overnight and very little wind.
No snow or rain expected. Low temperature to 18 degrees, highs expected to reach the high 30s to low 40s at sea level. NE wind 0-10 mph, with some areas reaching higher speeds near Whittier and Seward.
The next advisory will be issued Saturday, April 20th.
|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