EG,
I've seen them continue to march around and gobble/strut when it's raining and or snowing.
But when it's dumping like we had last Thursday I beleive they simply fly up in a tree to wait it out. There were a number of birds in our area and they didn't say a peep til late the next afternoon. It had been warm and dry for nearly a month....then a 40 degree drop in temp and snow........It stalled out the process temporarily.
Tomorrow a.m. my 11 year old daughter will hopefully have the opportunity to put the wood to a long beard. We set up a blind last night and had 3 very nice gobblers marching around within 100 yards of the blind location.
Pictures and stories to follow.
WD