i want to start with you kevin trenberth. maybe you can help people understand the basics. cyclone, hurricane, typhoon. what's the difference if any. >> just the region they occur. they're really the same phenomenon. the typhoon is in the pacific northwest, the cyclone is sort of australia and india, the bay of bengal and hurricanes are in the atlantic. >> ifill: think of this one, haiyan, what how is it worse and what causes it to be this intense? >> we don't often see storms get this strong. i mean the top winds of 190-195 miles per hour have only been four or five storms over the ocean reach that intensity. when it hit land at 190-195 we never seen that before. they extreak the energy out of the ocean. they convert the heat to the energy of their winds. the waters to the east of the philippines have the largest area of deep warm waters than any place on the planet. >> ifill: so kevin trenberth this is unique, this kind of force, this kind of impact to this area of the world. >> that's certainly the warmest area in the global ocean. and al so it's been warming up at the g