 Okay, got you. So like an EF-0 is like a weak, low speed, and then EF-5 is the most severe? Yes, you have that exactly right. Okay. So when the characters are describing the conditions for tornadoes in the movie, they use a lot of words like wind shear, updraft, mesocyclone, things that I was kind of Googling after I saw the movie. Can you describe the ingredients that make up a tornado and maybe define some of those words for us along the way?