Avalanche Forecast Sea to Sky
Sunday 10th February 2019
Strong outflow winds have produced stiff wind slabs. Lingering reactive wind slabs are most likely in wind-loaded areas: below ridgelines, under cornices, and around steep, unsupported features.
Moderate - Forecast snowfall amounts are uncertain on Tuesday
SUNDAY NIGHT: Cloudy with clear periods, possible isolated flurries, trace accumulation. Alpine temperatures near -13C. Ridgetop winds light from the east-southeast.MONDAY: Sunny with cloudy periods, isolated flurries with up to 5 cm accumulation. Alpine temperatures near -15C. Ridgetop winds moderate from the east.TUESDAY: Mix of sun and cloud with isolated flurries, trace to 10 cm accumulation. Alpine temperature near -11C. Ridgetop winds moderate from the northeast.WEDNESDAY: Sunny with some cloud. Alpine temperatures near -16C. Ridgetop winds light from the northeast.
A few small pockets (size 1) of wind slab have been reactive to skier traffic in immediate lee features. Otherwise, no new natural avalanches have been observed recently.
Heavy wind transport has produced a variety of wind affected surfaces including hard/soft wind slabs, sastrugi, and protected pockets of soft faceted snow. Most high north-northeasterly aspects are scoured and wind buffed, soft snow may still be found in sheltered areas and is more likely on south and west aspects. Widespread wind slabs have developed in the alpine and treeline with deeper deposits lower in start zones. Wind has affected all elevations including a surface wind skin at lower elevations.Due to scouring and wind-loading, anywhere from 0-80 cm of this wind-affected snow sits on a crust on all aspects below 2000m and solar aspects into the alpine. Current cold temperatures are promoting surface faceting and are breaking down the buried crust. In isolated and sheltered terrain at treeline and below, a layer of weak feathery surface hoar or sugary facets may be identified, but with little reactivity. The remainder of the snowpack is generally well-settled.
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Shifting winds and strong outflows have formed stiff pockets of wind slab at treeline and above. Deeper wind slab deposits may be found lower in start zones resulting from the recent intense wind event.
Be careful with wind loaded pockets, especially near ridge crests and roll-overs.Watch for whumpfing, hollow sounds, and shooting cracks.
Aspects: East, South East, South, South West, West.
Elevations: Alpine, Treeline.