For the rainy days i like to just sit it out and hunt it like a regular day. Just pick a spot where you know turkey will be and sit it out. Dont be impatient and leave the spot to early just because of a little rain, because rain does not effect turkeys all that much, however they tend not to move as much in a thunderstorm. But if its just going to be raining then i would sit at my best spot and wait it out, but keep your calls dry and sit still because they tend to gobble less on rainy days and you never know when one will be on top of you in no time without you knowing it.