Avalanche Forecast
Avalanche Bulletin - Little Yoho
Solar heating over the last two days resulted in a widespread avalanche cycle up to sz 3 with some events running full path. Windslabs in the alpine and loose wet avalanches at lower elevations will remain a concern into the weekend.
Avalanche Problem 1: Loose Wet
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
Travel and Terrain Advice
- Use extra caution on slopes if the snow is moist or wet.
Avalanche Problem 2: Wind Slabs
What Elevation?
Which Slopes?
Chances of Avalanches?
Expected Size?
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 wind slabs producing large results Wednesday during control work
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 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 today produced mainly windlslabs 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
While skies do not look as clear for Friday, freezing levels are forecast to be a bit higher and some sunny periods should be expected. West winds will be increasing in the alpine through Friday into the strong range for Saturday as a pacific system brings up to 8cm of snow with a freezing level around 2000m.
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While only smaller loose wet events were starting at upper elevations Thursday, all avalanches entrained mass just above treeline and quickly gained size.