 You need evacuation at high levels, but it doesn't last for very long. It's a day or two. So you'll have 150 to 160 knot hurricane for three or four days. Then you'll lose the evacuation aloft. It'll weaken. It'll run into shearing then. You can't have shear into a hurricane where the winds eat it up because then you can't form a concentric closed eye. The center of the storm will be removed