Avalanche Forecast

Moderate -

SUNDAY NIGHT: Clear with a few clouds, moderate northeast wind, alpine temperatures drop to -18 C.MONDAY: Mix of sun and cloud with some isolated flurries possible later in the day, possible accumulations of 5 cm, moderate northeast wind, alpine high temperatures around -15 C.TUESDAY: Mix of sun and cloud, moderate northeast wind, alpine high temperatures around -18 C.WEDNESDAY: Cloudy with scattered flurries and localized accumulations of 5 cm, moderate southeast wind, alpine high temperatures around -12 C.

On Saturday, a few small (size 1-1.5) human triggered slab and loose dry avalanches were reported. One large (size 2.5) naturally triggered persistent slab avalanche was observed on a south aspect near Paulson Summit.On Friday, numerous small (size 1) storm slab avalanches were triggered by riders in steep terrain.Human triggered avalanches were reported everyday between February 12 and 20. Although most avalanches were small (size 1-1.5), some had impressive propagation on buried weak layers (see some examples here and here). Last Tuesday, a notable size 3 persistent slab avalanche occurred on an east aspect at 2000 m. This avalanche was triggered by explosives and failed on the persistent weak layer that was buried on February 7th.

The latest storm brought 15-25 cm of low density snow that now covers variable wind slabs at higher elevations and sun crusts on south-facing slopes. Fresh wind slabs may be forming in exposed terrain.A weak layer of surface hoar (feathery crystals) and a crust that was buried on February 7th is now 30-50 cm deep. This layer has been reactive, and has produced avalanches as large as size 3. Two other surface hoar layers are buried 50 to 80 cm deep the snowpack (referred to as the February 1st and mid-January layers). Although they have not been reactive recently, they are still being monitored by professionals. The lower snowpack is considered generally strong.