The Community Snow Observations (CSO) project recruits community scientists to help collect snow depth observations -- anytime and anywhere, and submit via the mobile-sharing platform Snow Scope or desktop program Snow Pilot ( The geotagged CSO observations are used to validate snow remote sensing products and to correct Snow Water Equivalence (SWE) measures in hydrological models for this region. Near real-time modeling results for many mountain domains across the United States are displayed daily on It is extremely easy and quick to participate! All you need is: 1) A measurement tool (an avalanche probe, or a yard stick will do!) 2) Snow Scope app installed on your mobile phone (Android/iPhone) 3) Undisturbed snow Have fun, and play safe in the snow!