If you carry metal weapons during thunder and lightening storms in Zelda: Breath of the Wild then they will start to spark and before long lightning will strike you causing damage. You can 'REMOVE' the items to stay safe, however if you want to know what weapons you can use using Thunderstorms just check the items screen.
All items that can be struck by lightning will show an animated lightning graphic overlay, the ones that are safe to use don't have the lightening animations.
All items that can be struck by lightning will show an animated lightning graphic overlay, the ones that are safe to use don't have the lightening animations.