Purcells

Watch for wind slabs immediately lee of ridge crest, pay attention to cornices and remember that we're still dealing with a persistent slab problem. Choose well-supported lines and travel early to take advantage of the overnight re-freeze.

Temperatures are expected to be slightly cooler Wednesday as we move into a pattern across the province that remains quite "winter-like." WEDNESDAY: Scattered cloud cover with potential for some clearing in the afternoon, freezing level beginning around 1400 m rising to about 1900 m, light west/southwest wind, 1 to 4 mm of precipitation possible. THURSDAY: Broken cloud cover, freezing level beginning around 700 m rising to about 1600 m, light south/southwest wind, 1 to 3 mm of precipitation possible.FRIDAY: A few clouds, freezing level beginning around 500 m rising to about 2000 m, light west/southwest wind, no significant precipitation expected.

Moderate - Timing or intensity of solar radiation is uncertain on Wednesday

On Monday intense wind loading produced wind slab avalanches to size 2 on north facing terrain around 2400 m. Solar radiation (direct sun) also produced natural storm slab and loose wet avalanches to size 2.5 on on a variety of aspects between 1700 and 2600 m. We received the following information second hand, and all the details may not be accurate, if you have additional information, we would love to hear from you. On Sunday six riders were involved in an avalanche up Doctor Creek. One was stuck, the second went to help and also got stuck, the third rode up the slope to help and triggered an avalanche that buried the three, "up to their faces." The riders credit airbag packs with saving their lives and although one sled was wrecked, the group was able to extricate themselves. The slope was reportedly north facing and failed as a wet slab.

Recent wind and cold snow have formed wind slabs 10 to 50 cm in depth in the alpine that sit on a mix of crusts and surface hoar. Test profiles show resistent planar failures at this interface. In wind sheltered terrain Saturday's new snow rests on a surface crust that exists on all aspects aside from true north below 2000 m. This crust extends up to around 2400 m on south facing slopes. The mid-March Persistent Weak Layer (PWL) is now 40 to 90 cm below the surface. This layer is composed of a crust on all aspects at low elevations. At upper elevations the layer presents as a crust on solar aspects (south and west) and buried surface hoar on polar aspects (north and east). The likelihood of triggering a deeper persistent slab avalanche is steadily decreasing but the consequence of doing so remains high. Persistent slab avalanche activity on polar (north and east) aspects has dramatically decreased and solar (south and west) aspects are expected to be the most suspect over the next few days.Deeper persistent weak layers from January and December are still being reported by professional observers, but are generally considered dormant.