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Avalanche Forecast

Archived

Feb 10th, 2019–Feb 11th, 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 and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Mt Hood.

Very dangerous avalanche conditions are developing at Mt. Hood as heavy snowfall combined with strong to extreme winds produce very large and reactive slab avalanches. The slab is developing above weak old snow sitting on a strong crust. Avoid all terrain where avalanches start, stop, or run!

Discussion

Snow and Avalanche Discussion

A one-two punch of storm systems will impact the Mt. Hood area through the end of the day on Monday, bringing high snow loading rates and tremendous wind transport to form deep slabs and wind drifts. Very dangerous avalanche conditions will develop from late Sunday night and increasing throughout the day on Monday. Safe travel may be found only in non-avalanche terrain and in lower-angle old growth trees.

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.

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.