What is the ruling on someone who yawns loudly with an open mouth?

It is disliked to intentionally yawn, and it is even more disliked during prayer. The yawner should cover their mouth and be careful not to make a sound. It is better to suppress the yawn as much as possible, based on the Prophet's (peace be upon him) saying: "Yawning is from Satan. So if one of you yawns, let him suppress it as much as he can, for if one of you says 'Haa', Satan laughs."