Notice A lot of electrical activity closer to the ground (a sign of of stress in the ground below) along with the lightning in the sky. This area is not far from the crayton boundry where earth quake activity or the force of the ones that occurs on the cost push east along the boundry. This type of discharge maybe what is resulting in the sounds to some extent, but even so the pressure in the ground is unnatural. The gates of hell maybe readying that time for when they fully open up.
Researching “crayton boundary”...