Avalanches are fast moving snow flows that primarily occur in mountainous regions. They are of particular concern for anyone who wants to venture in those areas. Parks will advise and place warning signs of areas of high risks. Obey the rules.
If you are venturing out into the mountains, be prepared by having the proper skills and equipment along with you. Obviously you should have a proper pre-trip plan before leaving which you leave with the appropriate people. Be careful to not provoke an avalanche. People actions are usually what cause an avalanche.
Here are some more links to help you to learn more about avalanches.
5. Wikipedia - Avalanches
The following information is from the Get Prepared site of the Government of Canada
Thousands of avalanches occur in Canada each year. They happen in all regions of Canada, but are more frequent in the mountains of British Columbia, Yukon and Alberta. Avalanches can be triggered by wind, rain, warming temperatures, snow and earthquakes. They can also be triggered by skiers, snowmobiles, hikers, vibrations from machinery or construction.
If you become caught in an avalanche, try to:
When the avalanche slows, attempt to:
When the avalanche stops, begin to: