Believe it or not, these clouds do not indicate severe storms. Instead, they indicate sustained rain or snow (in this case, rain). These are nimbostratus clouds, as opposed to the cumulonimbus clouds that bring chaos and scary stuff.
What is your theory? I don't have a dog in the hunt about this, but I was just wondering with 30 or more Bigfoot sightings every year how come no one ever bags one? That is the one thing that makes me doubt. I read the sightings which are full of tales of people fleeing in terror, but almost no one ever opens fire. What do you guys think?