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Understand avalanches and travel safely through them.
Forest Service National Avalanche Center
Avalanche Awareness Website
A great introduction to understanding avalanches and traveling safely through avalanche terrain. Contains lots of great videos.
www.fsavalanche.org

American Institute for Avalanche Research and Education
AIARE multi-day avalanche courses form a unified training program, Level 1 through Level 3, that focus on decision-making and risk management in avalanche terrain. A 1-2 hour Avalanche Awareness course is also available. Courses are taught by "course providers" throughout the country. Be aware that not all the courses offered by the providers are at the AIARE standard.
www.avtraining.org
www.avtraining-admin.org/courseprov.cfm for a list of providers

Avalanche Danger Scale
www.avalanche-center.org/Education/danger/usdanger.php

California Avalanche and Weather
Contains links to other centers
www.avalanche-center.org/Bulletins/Calif

Sierra Avalanche Center Advisory
Tahoe National Forest
http://www.sierraavalanchecenter.org/advisory.php

Mt. Shasta Avalanche Center Advisory
http://www.shastaavalanche.org/advisories/advisories/avalanche-advisory

Eastern Avalanche Center
www.esavalanche.org

Avalanche.org
Includes links for many areas and other information
www.avalanche.org

National Avalanche Center
Includes links to many areas and other information
www.avalanche.org/~nac

Worldwide Avalanche Bulletins
www.avalanche-center.org/Bulletins