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Avalanche Forecast

Archived

Feb 11th, 2019–Feb 12th, 2019

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Mt Hood.

Continued heavy snow, wind and warming will tip the balance and lead to surprising and life-threatening avalanches. With very dangerous avalanche conditions, traveling in avalanche terrain is not recommended. Put extra space between where you travel and any terrain where avalanches could start or run to overhead slopes.

Discussion

Snow and Avalanche Discussion

2-3 feet of storm snow has already fallen as of Monday afternoon. An additional 1-2 feet of denser heavily wind affected snow overnight and Tuesday will tip the balance and create very dangerous avalanche conditions.  Safe travel may be found only in non-avalanche terrain and lower-angle slopes well away from where avalanches start, run or stop.

Professions triggered 1-2’ wind slabs with slope cuts on west through southwest slopes in the White River Canyon at 5500 to 6500 ft on Sunday afternoon.

White-out conditions Monday prohibited views of avalanche control results in higher terrain. 

Snowpack Discussion

New Regional Synopsis Coming Soon

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.