I hunted in downpours saturday morning,wind,lightning,hail and if your in a blind looking out over an area surrounded by trees when all this calms down they hit the fields for sure. We had 8 males and at least 5 to 6 hens all around us but only 3 jakes got within range.
As far as calling goes once they get off the roost keep calling with loud yelps and clucks every 10 to 15 minutes,also some cutting hen calls once you get a gobble or see the toms coming your direction. I used a Knight & Hale Little Lier Box call and a Tech 3 Hunter Specialty mouth call alternating the two different sounding calls. The one strutter got within 100 or so yards but that was it,the Jakes got within 35 yards of my 3 decoys,1 jake and 2 hens. One Strutter got hened up so my youth hunter passed on the jakes because it was the first day of hunting in Indiana. They will come out in bad weather but you must find a field area with some forest close by where they are shielded a little from the wind. When heavy rain comes in they move to the cover but will come back out once again when it eases up.
We were in a blind so we had it pretty good even though the weather was real tough. Good luck and take care.