When the rain starts on a highest level Turkeys will head to openings such as fields. They do not like the woods as their one defence that they have (Hearing) is now not a option for them because of the noise in the woods.

Turkeys are a lot like us, If we stand in the rain for a time period , we get to a point that we don't want to be there. If we get in a very noisy room and can not hear what people are saying , we simply stop talking or move to another room that we can hear better.
The same applies with turkeys , they can not hear hear well and the drops of rain sound like the tail gate of dump trucks slamming after dumping a load.

They need to head to clearings such as fields to us the other defence they have and that is Eye sight. They can also hear a little better in fields.

They are not going to head to a feild they are not use to , so they will travel to places that they have been before. This is why your scouting comes into effect. The places you have seen sign before the rain are places to spend the rainy days...BT