Avalanche Forecast
Avalanche Bulletin - Little Yoho
A surge of moderate to strong SW wind today created fresh windslabs and have loaded cornices. Choose conservative terrain and minimize exposure to overhead hazard until the snow has a chance to bond.
Avalanche Problem 1: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- Use caution in lee areas in the alpine and treeline. Storm snow is forming touchy slabs.
Avalanche Problem 2: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
While it has been several days since there have been any confirmed events directly associated with the March 15 crust, other temperature crusts have now become buried in similar locations and are providing a good sliding layer for the new storm snow.
Travel and Terrain Advice
- Be cautious with convexities and steep slopes on solar aspects.
- The storm slab may be more sensitive to human triggering on solar aspects where it sits on a crust
Avalanche Problem 3: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Lower elevations may see loose wet avalanches start to occur later in the day with either temperature increases or with solar input as skies clear late Wednesday.
Travel and Terrain Advice
- Use extra caution on slopes if the snow is moist or wet.
Avalanche Summary
Touchy windslabs 10-40 cm thick developed Tuesday afternoon with moderate to strong SW wind. A few natural avalanches were observed and windslabs were reactive to ski cutting and explosive control.
Snowpack Summary
Up to 50 cm of storm snow near the divide affected by moderate SW winds Tuesday afternoon. Several buried temperature crusts exist to 2000m on all aspects and to ridge tops on solar slopes, including the Mar 15 sun crust down 35-50 cm in the alpine. Moist snow at lower elevations, with the entire snowpack becoming moist near valley bottom.
Weather Forecast
Temperatures will remain relatively cool, with cloudy skies and with freezing levels up to 1800m for Wednesday. Winds should diminish through the day as skies clear Wednesday evening and a high pressure builds in the region.
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20-50 cm of storm snow has fallen over the past few days with the greater amounts near the divide. Increased SW wind Tuesday afternoon loaded lee terrain creating reactive windslabs.