Don't trust the online "flight status" sites, even the ones hosted by your airline. I just called the carrier I booked and was told flat-out that there will be no flights going into or out of Boston for most of the day tomorrow (possibly all of the day tomorrow). If you have a connection in any airport on the East coast, be sure to check whether it's even open. I note that JFK is now closed, which is an accomplishment.
I called the Boston Marriott and canceled my room reservation. It was made clear to me that they were dealing with a high volume of cancellations. Apparently you must cancel before 6pm tomorrow (Monday) to avoid charges. That seems reasonable enough.
If you make it to Boston, please feel free to share your observations here.