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Avalanche Forecast

Archived

Mar 23rd, 2025–Mar 24th, 2025

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Little Yoho.

A warm storm approaches from the west bringing new snow, rain, strong wind and rising freezing levels. The storm arrives Monday, and by Tuesday freezing levels will reach 2500 m and cause an avalanche cycle in the region.

Confidence

Low

Avalanche Summary

Very minimal observations over the past few days except around Mt Field but reports from guides working in the area indicate several large avalanches releasing in steep, wind loaded terrain (up to size 3).

Snowpack Summary

More new snow and even rain will add load to the snowpack and create new storm slabs for Monday and Tuesday. At treeline, 70-100 cm of snow overlies the Jan. 30 / Feb. 22 drought layers, which consist of 20-30 cm of weak faceted crystals. These layers have been reactive in tests and recent avalanches in adjacent areas. In this thicker, western, snowpack region, the facet/depth hoar basal layer is less prominent than it is east of the divide but likely exists in thin areas.

Weather Summary

Snow, warmth and rain are coming our way for most of this week. Expect treeline temperatures to reach 2000 m on Monday, 2400 m on Tuesday and even higher on Wednesday. Along with this comes a mix of snow and rain, with some weather models calling for about 15-30 cm of snow overnight into Monday and Tuesday with rain on Tuesday.

Terrain and Travel Advice

  • Make conservative terrain choices and avoid overhead hazard.
  • Be careful as you transition into wind-affected terrain.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.