American Avalanche Association - The American Avalanche Association (AAA) is comprised of a collective group of dedicated professionals engaged in the study, forecasting, control and mitigation of snow avalanches.
Avalanche.org - is the central location for all things avalanche in the United States
Canadian Avalanche Association (CAA) - Operates the Canadian Avalanche Centre (CACentre) in interior British Columbia, at the heart of avalanche country. Best all-round site for info in Canada.
Northwest Weather & Avalanche Centre (NWAC) - The Northwest Weather and Avalanche Center (NWAC) promotes safety by helping reduce the impacts of avalanches and adverse mountain weather on recreation, industry and transportation in Washington, and northern Oregon through data collection, mountain weather and avalanche forecasting and education.