Another site I like to look at is: http://www.wcc.nrcs.usda.gov/
There are certain places that have snow monitoring equipment and you can see what the depth is on any given day. Historical data is also available. There is one site in OR where on 5/1/12 the snow depth was 43". 3 weeks later, it was all gone. Plans are just that. Plans. Subject to change. Being retired means that I can go at the drop of a hat or change my plans at the last minute if the need arises.