|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.|
|Signal Word||Size (D scale)||Simple Descriptor|
|Small||1||Unlikely to bury a person|
|Large||2||Can bury a person|
|Very Large||3||Can destroy a house|
|Historic||4 & 5||Can destroy part or all of a village|
A widespread poor snowpack structure with a persistent slab problem and weak basal October facets (sugar snow) are the primary concern. This layer has already failed in previous storm cycles, and will again in the current storm cycle. Avalanches on this layer may take out the whole snowpack, sliding at or near the ground level.
Storm snow avalanches will also be a problem today on all aspects. These will be deeper and more dangerous at the mid to upper elevations with the added possibility of stepping down to the basal facets at the ground. At the lower elevations, these will be shallower, and possible to human trigger.
Dry Loose avalanches are another concern on all aspects at all elevations on slopes 40 degrees and steeper. With significant amounts of dry new snow, you can expect dry loose “sluffs” to be abundant and sizeable.