|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.
After 8 days of brilliant sunny skies and springtime temperatures, a few clouds and cooler air is slated to move in today. The decrease in temperature will limit wet avalanche activity on south facing slopes and avalanche danger has dropped to Normal Caution (LOW danger). Over the past week, avalanche activity has been related to afternoon warming on southerly facing slopes. This triggered a number of wet loose slides, a few moist slabs and a few glide avalanches. As the southerly slopes now sport a solid sun crust, which may not soften today, and wet avalanches are not expected, glide avalanches are the exception moving forward. Things to keep in mind if you are headed out today:
Glide avalanches on the lower portion of Raggedtop Mtn, releasing yesterday (3/1). Photo taken from Girdwood.
Recent wet loose avalanche activity in upper Glacier Creek / Girdwood Valley.
South of Turnagain – Summit Lake and Silvertip zones: For anyone traveling in this area note that a shallow snowpack with a generally poor structure exists. A variety of old weak layers (facets and buried surface hoar) sit in the mid and base of the snowpack. It is uncertain as to how reactive these layers are at this point and if they could produce a slab avalanche. We do know whumpfing has been observed in the Summit area and last Thursday’s (2/21) wind event triggered many large slab avalanches breaking in deeper weak layers. Assessing the slab as well as the weak layer will be important. Old wind slabs in steep terrain sitting on weak snow are the most suspect places to trigger an avalanche.
Yesterday: Sunny skies with light and variable winds were over the region. Temperatures climbed into the mid 30’sF along the high peaks and mid elevations, while valley bottoms reached 30F. Overnight, temperatures have only dropped to the teens at most low elevations while ridgetop temperatures have dropped to the teens as well – limiting the inversion.
Today: A few clouds are slated to move in today along with a chance for valley fog. The ridge of high pressure is weaker and that has decreased temperatures in the Alpine and increased them at sea level. Daytime highs should reach the mid 20’sF along ridgelines and the mid 30’sF in the low elevations. Ridgetop winds will be light from the east, 5-10mph.
Tomorrow: Mostly cloudy skies with a chance for a snow flurry or two will be over the area. No accumulation is expected. Mountian temperatures look to remain in the teens to 20’sF while ridgetop winds will be light from the east.
|Temp Avg (F)
|Snow Depth (in)
|Center Ridge (1880′)
|Summit Lake (1400′)
|Alyeska Mid (1700′)
|Temp Avg (F)
|Wind Avg (mph)
|Wind Gust (mph)
|Seattle Ridge (2400′)
|Avalanche: Base of Seattle Ridge
|Troy Tempel, Thomas Lees, .Josh Bollaert, Damian Naquin
|Observation: Lynx creek
|Observation: Tincan Trees
|Moderow / Clayton
|Observation: Turnagain (below the uptrack)
|Alaska Avalanche School Moto Level 2
|John Sykes Forecaster
|Observation: Tincan Backdoor, Center Ridge
|AAS Level 1 / R Sullivan
|Avalanche: Tincan Trees
|Schauer/ Moderow/ Stephenson Forecaster
|Schauer/ Moderow/ Clayton Forecaster