Plot whole

Nah. It's the cows.

Nah, it's a plot half.

True. These tornados held a grudge and were animalistic. Went after specific family members. Even hissed like a cat at times. Very scary.

I thought the guy from The Princess Bride was the bad guy.

No the real plot hole is how they portray the tornado and how the character survive what would have killed them. An F5 as they claim they are running from in the last part of the movie will literally remove everything from the group up. I've seen the aftermath of one and houses didn't leave any bit of the plumbing pipes or anything, it was nothing but a neighborhood of concrete slab foundations where houses once stood, as if someone had shaved the earth and just cut off everything. So when they strap themselves to some pipes the truth is those pipes would have been eliminated at the ground, not by the winds which in an F5 will be over 250 mph, but by the debris that is going to be moving at that same speed and pummeling everything in its path. They would be gone in real life... Of course there were several other huge mistakes they made along the way but the ending was just complete shit.