Purcells

New snow and wind will mean that storm slabs are to be expected, and will likely be reactive to human triggering, especially in wind loaded areas.

Moderate -

FRIDAY NIGHT - Flurries, 5-10 cm / southwest winds, 30-60 km/h / alpine low temperature near -5SATURDAY - Cloudy with sunny periods and scattered flurries, 3 cm / southwest winds 20-40 km/h / alpine high temperature near -5SUNDAY - Mainly cloudy with isolated flurries / southeast winds 10-15 km/h / alpine high temperature near -10MONDAY - Mainly cloudy / northeast winds, 10-15 km/h / alpine high temperature near -16

On Thursday, a few natural and human triggered avalanches to size 1.5 were reported on all aspects around treeline. These reportedly failed on the persistent weak layer that was buried in mid January.There is a great MIN report from January 22nd that shows a natural avalanche (size 3.5) in International Basin, on the deep persistent layer. Check it out here. While this is an old observation, it is relevant as this layer is still lurking, and may catch people off guard.

10-30 cm of new snow has fallen in the region since Thursday. This new snow sits wind slab, surface hoar (feathery crystals), facets (sugary snow) and a crust on sun-exposed slopes.  A persistent weak layer that was buried in mid January is now buried 20-50 cm. This layer consists primarily of surface hoar, however there is also a crust associated with it on sun-exposed slopes. This layer has been most reactive at treeline and below.The base of the snowpack has a deep persistent weak layer near the ground. This layer consists of facets over a crust. This weak interface continues to produce large and destructive avalanches that are sporadic in nature, and very difficult to predict.  This layer is most likely to be triggered from areas where the snowpack is shallow and weak. Rocky alpine bowls, ridge crests and rocky outcroppings are some examples of the kind of terrain to be wary of.