There's a lot of lightning in your area. http://en.blitzortung.org/live_lightning_maps.php
But this thunder is different, as it is the sound of lightning going from the sky to the atmosphere.
"ZetaTalk Response 6/12/2010: We have stated that static electricity will be generated by the friction of the charged tail of Planet X against the Earth during the last weeks, and that this will result in what the ancients described as trumpeting from the skies, a type of thunder when the lightning leaves the Earth's upper atmosphere on its way to Planet X. Except for the point where it leaves the Earth's upper atmosphere, or the point where it arrives at Planet X, this lightning moves silently and invisibly. But in the upper atmosphere of Earth would not take the form that traditional lightning passing from sky to Earth assumes. There, a sudden snaking down to Earth occurs, the pathway lit for a moment, followed by the thunderclap. Upper atmosphere lightning has less to interact with, no hydrogen or oxygen or other components to fuse or split, so it lacks the flash of light. But there is a point of connection where an electrical discharge is accumulating in Earth's upper atmosphere to a point in space which this discharge can use as a route for grounding on Planet X. When that connection is make, what is the appearance from Earth? As these clever scientists have shown, a laboratory plasma discharge takes the appearance of ancient petroglyphs, worldwide. This is not a clash of Venus or the Dark Twin that creates such displays, but rather the drama that close contact with Planet X during the last weeks presents."
http://zetatalk.com/newsletr/issue190.htm