Alert level is 100CPM. Today we are at 81.4CPM and 74.9CPM, plus a steady return on the CDV (civil defense) beta counter.
This means small particles of radioactive material are indeed coming down in the precipitation. Past tests show around 30CPM in the same spot on a nice day with no precipitation.
Several past snow storms have produced similar results, from 80CPM to 110CPM !! Last year in 2012, did multiple tests of the snow showing alert levels were reached last year.