Avalanche Forecast
Issued: Feb 17th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs.
ahanna,
Avalanche Canada
Be ready to step back from sun exposed slopes in the afternoon. Storm slabs may remain reactive in deep wind loaded pockets in the alpine and where it overlies a weak layer of surface hoar crystals at treeline and below.
Summary
Confidence
Moderate - Uncertainty is due to the timing or intensity of solar radiation and its effect on the snowpack.
Weather Forecast
Monday night: Scattered cloud. Light northwest wind. Freezing level valley bottom.
Tuesday: Mix of sun and cloud. Light southwest wind. Freezing level 700 m.
Wednesday: Sunny. Moderate to strong south wind. Freezing level 500 m.
Thursday: Mostly cloudy. Moderate southwest wind. Freezing level 500 m.
Avalanche Summary
Over the weekend, natural storm and wind slab avalanches size 2-2.5 were the story in the alpine. One size 3 was observed over the highway corridor and at least one size 2 storm slab was solar triggered. At treeline, human triggered storm slabs size 1-1.5 have been running on surface hoar 40 cm deep.
Snowpack Summary
40-60 cm of snow from the past week has seen some redistribution in exposed alpine areas, with soft wind slabs forming in immediate lees of ridge crests. At treeline and below, it may sit over patches of surface hoar in wind sheltered areas or crusts on solar aspects.
A thin layer of facets that formed during the January cold snap is now about 120-170 cm below the surface while an early season crust lingers at the base of the snowpack. These layers produced a few large natural avalanches in early February but have recently been unreactive.
Terrain and Travel
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- Be alert to conditions that change with elevation and wind exposure.
- Approach steep open slopes at and below treeline cautiously, buried surface hoar may exist.
- Avoid sun exposed slopes when the solar radiation is strong, especially if snow is moist or wet
Problems
Storm Slabs
40-60 cm of new snow has accumulated over the past week. In many areas the recent snow will be on a positive stabilizing trend, but human triggered avalanches remain a serious concern. Particularly on steep slopes where the new snow is settling over crust or surface hoar layers, as well as in exposed areas where much of this snow has been transported into thick wind slabs.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Feb 18th, 2020 5:00PM
