 It's not true all the time, but often the strong, the significant or strong tornadoes tend to be larger. So the path width can be in half a mile or sometimes up more than that. So that's going to be one of the things that the survey teams assess is they will be measuring how large was the tornado as well as how strong the tornado was. So there were two high risk areas, one across Arkansas, Tennessee and Mississippi and then another one across Iowa and Illinois and this is used by the Storm Prediction Center to assess the risk of severe thunderstorms. So it's basically on a scale of zero to five and this is as high as the scale gets. It's not very common, this is the first time and I believe more than ten years that we've had two areas of high risk. That's very uncommon because typically the atmosphere likes to focus on one particular area but in this case today we had two areas of concern and a broad area of what's called a moderate risk which is four out of five on the scale. So this was a pretty widespread severe weather threat with a large area of concern for tornadoes. We have a powerful storm system moving across the Great Plains and it's drawing a lot of warm moist air from the Gulf of Mexico into a large portion of the Mississippi Valley all the way up into portions of Iowa, Illinois, Indiana, those areas. So that's the fuel we need for the thunderstorms. We also have a lot of wind energy which is what you need to generate the wind shear, the strong tornadoes that help create that wind shear. And then like I said you have this kind of powerful storm system that's helping to unite those two ingredients. These ingredients don't always come together so effectively and unfortunately they just have in this case. And this is a very favorable time to be here for that to happen.