It's not like a blow hole or a geyser. It's an very small cave in the rocks. It's probably most active when the tide is coming in. There is no timing really - just the surging of the water. The water rushes into the "cave" hits the stone wall and splashes out with a roar that sounds like thunder. I've seen people stop and look to the sky trying to see where the storm is.
Thanks for checking out Thunder Hole, gang! I do want to point out, this is NOT my photo. My photo looked so calm and peaceful, I wanted you all to know what it CAN look like!
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