Avalanche Forecast
Avalanche Bulletin - Little Yoho
Expect a poor freeze below 2000m Saturday, and some new wind slabs up high. We will be switching to "spring conditions" over the next couple of days. The coming week looks to be a warm one.
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: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Sun likely will not be a major issue Saturday, but rain is possible at lower elevations. With a poor freeze, this could cause some natural activity in steep below treeline terrain.
Travel and Terrain Advice
- Use extra caution on slopes if the snow is moist or wet.
Avalanche Problem 3: Persistent Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
A few of the avalanches seen over the last two days were deeper than the rest. We suspect that the both facets and crust on the March 15 interface were to blame. Good to bear in mind for coming warm periods.
Travel and Terrain Advice
- Be cautious with convexities and steep slopes on solar aspects.
- Avoid shallow snowpack areas where triggering is more likely.
Avalanche Summary
Avalanche control yesterday produced mainly wind slabs in the sz 2 range 20-50cm deep with decent propagations up to 50m wide. Several of these events entrained more mass as they moist snow at lower elevations. Large loose wet avalanches were seen on both Mts Stephen and Field today to sz 3.
Snowpack Summary
Up to 50 cm of storm snow near the divide affected by strong SW winds Tuesday evening. 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
10-15cm is expected in Little Yoho Saturday with Strong SW winds with the potential for light rain at valley bottom. There will be a poor freeze below 2000m but temperatures should cool slightly in the afternoon with the passage of a cold front. A dramatic warmup is expected next week.
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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. New snow with strong winds will add to this problem in the short term.