How Can I Support The Mount Shasta Avalanche Center? Become a Member! <--break-> We value our Members. The Mount Shasta Avalanche Center (MSAC) would not exist without the support of Members. We rely on annual membership donations to fund what we do. Please become a Member if having a professional avalanche advisory, real-time weather data, and free avalanche education, among many other things, make your Mount Shasta Area backcountry experience better.