Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Regions
Glacier.
Today is a great day to ride/ski fresh, deep snow in the trees.Avoid exposing yourself to avalanche terrain.
Weather Forecast
Walking through the 20cm at Rogers Pass parking lot with your favorite pair of Nike shoes would unenjoyable this morning.Today will bring periods of light snow flurries with sunny breaks, temps ranging from -7 to -11 and 15-30km/hr winds from the southwest. Thursday will be mainly sunny with another pulse of snow arriving early Friday morning.
Snowpack Summary
30cm in the past 24hrs brings our weekly snowfall to 110cm with a height of settled snow of 330cm at 1900m. Moderate southwest winds have redistributed new snow into pockets of wind slab in the alpine and exposed treeline areas. Persistent weak layers are now buried 150-200cm and a sun crust on steep solar aspects is down 20-40cm.
Avalanche Summary
Numerous new avalanches observed this morning while driving the highway corridor to work up to size 3.0.Two days ago a group ascending MacDonald West Shoulder #4 remotely trigger a size 3.0 into NRC Gully from 10m away, the dust cloud settled within a few hundred meters of the highway. Thankfully no one was involved in the avalanche.
Confidence
Problems
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.
Persistent Slabs
Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.
Cornices
Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.