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Avalanche Forecast

Archived

Jan 1st, 2020–Jan 2nd, 2020

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Mt Hood.

Strong winds and new snow are building fresh wind slabs. These slabs may be poorly bonded to a saturated and frozen surface. Avoid steep lee slopes with freshly drifted snow. Evaluate the bond between new and old snow.

Discussion

New Year’s Day was a wet one on Mt Hood! Telemetry from the ski areas showed 4.0-4.5 inches of water in the last 24 hours! Most of that fell as rain or freezing rain Tuesday night and extended up to 7000’ or higher before cooling down and switching to snow Wednesday afternoon. 

 

At low elevations, a rain saturated and re-frozen snowpack will make travel conditions the biggest concern.

Snowpack Discussion

New Regional Synopsis coming soon. We update the Regional Synopsis every Thursday at 6 pm.

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.