Avalanche safety
Avalanches are probably the most serious and deadly danger faced on VOC trips. Avalanhces kill about 10 people every year in Western Canada.
Why you need avalanche trainning
- In about 87% of avalanche fatalities, a member of the victim's party triggered the avalanche. It's not a matter of luck.
- For complete burial, survival rates are highly dependent on a quick rescue. Only members of the victim's party, with appropriate equipment and trainning, have a reasonable chance of getting the victim out alive. Mountain rescue and ski patrol are for body recovery only.
CAC Avalanche Bulletin
There are two levels of avalanche information bulletins published by the CAC. The Backcountry Avalanche Advisory is the most basic level, intended for people with no avalanche trainning. The Public Avalanche Forecast is next level of information, intended for people with basic avalanche trainning such as the RAC weekend avalanche course. The PAF contains a danger rating and a discussion of snowpack, weather and travel conditions.
BAA Danger Ratings
| Avalanche Conditions | Travel Advice | Guidance for Amateur Recreation |
|---|---|---|
 Good |
Normal Caution | Avalanches are infrequent but possible. Appropriate conditions for informed backcountry travel. |
 Serious |
Extra Caution | Avalanches will occur with human and other triggers. Avalanche training and experience are essential for safe backcountry travel. |
 Poor |
Not Recommended | Avalanches are occurring frequently. Inappropriate conditions for backcountry travel without extensive avalanche training and experience. |
 Variable |
Extra Caution | Conditions change from good with frozen snow to poor with melted snow. Avalanche training and experience are essential to monitor conditions for safe travel. |
International Danger Ratings
These danger ratings are used in the CAC Public Avalanche Forecast
| Danger Level and Color |
Probability and Trigger | Recommended Action |
|---|---|---|
| Low | Natural avalanches very unlikely. Human triggered avalanches unlikely. |
Travel is generally safe. Normal caution advised. |
| Moderate | Natural avalanches unlikely. Human triggered avalanches possible. |
Use caution in steeper terrain on certain aspects. |
| Considerable | Natural avalanches possible. Human triggered avalanches probable. |
Be increasingly cautious in steeper terrain. |
| High | Natural and human triggered avalanches likely. | Travel in avalanche terrain is not recommended. |
| Extreme | Widespread natural or human triggered avalanches certain. | Travel in avalanche terrain should be avoided and confined to low angle terrain, well away from avalanche path runouts. |
Terrain Ratings
Avalanche Terrain Exposure Scale (ATES) v.1/04
| Description | Class | Terrain Criteria |
|---|---|---|
| Simple | 1 | Exposure to long angle or primarily forested terrain. Some forest openings may involve the runout zones of infrequent avalanches. Many options to reduce or eliminate exposure. No glacier travel. |
| Challenging | 2 | Exposure to well defined avalanche paths, starting zones or terrain traps; options exist to reduce or eliminate exposure with careful routefinding. Glacier travel is straightforward but crevasse hazard may exist. |
| Complex | 3 | Exposure to multiple overlapping avalanche paths or large expanses of steep, open terrain; multiple avalanche starting zones or terrain traps below; minial options to reduce exposure. Complicated glacier travel with extensive crevasse bands or icefalls. |
The detailed technical criteria for Simple, Challenging and Complex ratings are available from the Parks Canada website
Field Observations
A professionally taught avalanche course can teach you how to make observations in the field to assess avalanche risk.