The next few days represent an ideal time to monitor migration by counting birds crossing in front of the moon. The same will be true a (lunar) month from now. Unfortunately we need a wind shift in order to get things going. Patience is required, however, a single bird per minute is evidence of a big movement, so you might see one in 10 minutes as things are tonight. Counts can be converted to some quantitative measure of migration such as birds per mile of front per hour, and can actually be compared to radar reflectivity in dBz.