Actually, I think the storm was edging closer to the camera so it appeared to be getting more powerful, but was in fact just closer to the camera. But it is possible that there was an explosive updraft.
gosh I wish I wasn't at work during this....I live in Spearfish and the storm here was pretty much completely blocked out the sunlight and it looked like it was midnight outside.....You are very lucky my friend
Ah you can see the new updraft come up after the previous one. That’s cool. I don’t know exactly how one updraft dies and another pops back up but it does it.
