This member of "the gang" would not hesitate to book since the big snowfall is going to send every flight that day to and from that "snowy region" FUBAR.

Everything will be so scrambled that what you book will be less important than the timing of your call for help. If your itinerary is not going to work, most other itins for that day you can choose even this far out will not work as well.

Also, regardless of the statement in one of the above posts, as a DM you should be able to get yourself protected on any flight that shows anything, even if they are overbooking you. If the weather conditions are such that you get stuck overnight in ATL, you will not be the only one who misses the meeting or has the first world problem of being stuck overnight on the way home.