Should I keep my mare in stall during lightning storm, or let her have turnout?

Both of my horses are brought in for storms-- they would probably be just fine in their pasture-but I am more comfortable if they are in. If they happen to get caught outside when no one is home they have been just fine. But if I can I make sure they are put in. I have a couple neighbors that help me if we are not home and I help them. .