Avalanche Bulletin - South Columbia

Avalanche Bulletin - South Columbia

Date Issued:

Valid Until:

Forecaster:TRettie

Back off slopes if the surface is moist and limit exposure to slopes with cornices above.

Sun, 24 AprMon, 25 AprTue, 26 Apr
Alpine2 Moderate1 Low2 Moderate
Treeline2 Moderate1 Low1 Low
Below Treeline1 Low1 Low1 Low
Confidence: Moderate
  • The snowpack structure is generally well understood.

Travel and Terrain Advice

  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Avoid sun exposed slopes, especially if snow surface is moist or wet.
  • Carefully evaluate steep lines for wind slabs.

Cornice

Cornices may be weak and reactive to human triggers. Give them a wide berth when travelling on ridges. They are a significant hazard alone and may produce large slab avalanches as they fall onto the slope below. Cornice falls are more likely when the weather is sunny, warm, or windy.

Wet Loose

A above freezing layer at treeline could prevent overnight recovery. Wet loose avalanches could occur on all aspects and elevations except high north facing terrain.

Wind Slab

rider triggerable wind slab can still be found on high north facing terrain.

Forecast Details

Avalanche Summary

Natural wet loose avalanches up to size 2.5 have been observed on all aspects and elevations except high north facing terrain. We suspect that this kind of avalanche activity will continue due to warm temps and solar input.

Snowpack Summary

Dry snow and pockets of wind slab can still be found on high north facing terrain. Several crusts exist on solar aspects extending to mountain tops. Moist snow will likely be observed on solar aspects and at lower elevations.

Cornices are very large and exposure to slopes beneath them should be minimized, especially if the weather is sunny, warm, or windy. The snowpack deteriorates rapidly at lower elevations.

Weather Forecast

Saturday night: No new snow expected. Possibility of above freezing layer at treeline. Light southwest winds.

Sunday: A mix of sun and cloud with no new snow expected. Light to moderate south winds and freezing levels around 2300 m.

Monday: Cloudy with light flurries bringing trace amounts of new snow at higher elevations. Moderate south winds and freezing levels rising to 2300 m.

Tuesday: cloudy with 5 to 10 cm of new snow expected at higher elevations. Light to moderate southwest winds and freezing levels around 1800 m.

Source: avalanche.ca

Avalanche Bulletin - South Columbia