Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Dec 2nd, 2017–Dec 3rd, 2017

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

Regions

Mt Hood.

Isolated and stubborn pockets of wind slab may be encountered on Saturday near ridges. Early season terrain hazards still exist, such as poorly covered rocks, vegetation and creeks, particularly at lower elevations.

Detailed Forecast

Generally light showers Saturday morning should transition to more widespread shower activity in the afternoon and increase further Saturday night. See the NWAC mountain weather forecast tab for more details. 

Isolated and stubborn pockets of wind slab may be encountered on Saturday near ridges.  

Early season terrain hazards still exist, such as poorly covered rocks, vegetation and creeks, particularly at lower elevations.

Snowpack Discussion

Warm, wet weather before Thanksgiving caused wet snow and glide avalanches in the Washington Cascades as well as significant snowpack consolidation. There are no snowpack concerns below the Thanksgiving crust and in general new snow received post-Thanksgiving has reportedly bonded well throughout the range. 

During the week, a series of frontal systems have generally produced light amounts of new snow for the Mt. Hood area at generally moderate snow levels. 

Observations

On Wednesday, a professional ski patroller from Mt Hood Meadows toured to about 6600 feet, finding about 8-12" of recent storm snow well bonded to the crust from last week. Storm snow was deepest on N-E facing terrain and no avalanches were noted. Some rollerballing was noted on steep solar terrain due to direct sun warming.   

On Friday, NWAC observer Laura Green reported no new avalanche or snowpack concerns near and below treeline, with possible isolated pockets of wind slab above treeline. Laura noted that despite moderate winds above treeline, there was not much available snow for transport. 

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.