dr. emanuel: it's a speed limit. no storm ever exceeds this limit and a very small percentage of them actually come right up to the limit. most of them fall far short. now, the computer models behaved in some ways very differently from real hurricanes in that they always spun up to their speed limit. narrator: essential to answering why the hurricanes in the models were behaving differently from real hurricanes is an understanding of how real hurricanes work. dr. emanuel: if you look at a photograph of a hurricane from space, what you see, of course, is this beautiful, white spiral mass of clouds. it's a little bit hard to tell but those clouds extend from very close to the ocean surface up about 10 miles high. and the ocean surface is at a pretty high temperature -- 25 to 30 degrees centigrade. but the tops of the clouds in a hurricane represent the temperature that you find in the upper part of the atmosphere. it's very, very cold. it's around -80 degrees centigrade. so the hurricane's operating across a rather spe

dr. ezekiel emanuel, with the university of pennsylvania, great to have you here. thank you so much. >> thank you for having me. >>> all right. there has been a bunch of news today, including some bold-faced, big-type headline news that has just broken tonight here in new york at the united nations and we've got a live report on that next. so please stay with us. [ male announcer ] when you have sinus pressure and pain, you feel...squeezed. congested. beat down. crushed. as if the weight of the world is resting on your face. but sudafed gives you maximum strength sinus pressure and pain relief. so you feel free. liberated. released. decongested. open for business. [ inhales, exhales ] [ male announcer ] powerful sinus relief from the #1 pharmacist recommended brand. sudafed. open up. >>> we have some significant news breaking late tonight here in new york, where the united nations is still meeting in its general assembly and where the obama administration appears to have achieved a big dploeptic breakthrough tonight. at least, that's how senior state department off

dr. ezekial emanuel, it's so good to have you on the program.hank you. >> thank you for having me. >>> israeli prime minister benjamin netanyahu sending a harsh warning this morning to president obama. don't trust iran. netanyahu is meeting with the president at the white house. he believes iran's outreach to the u.s. is a smoke screen to hide plans to use nuclear weapons. the two leaders also expected today to talk about syria's chemical weapons and the israeli/palestinian conflict. >>> to paul particulars now where "saturday night live" kicked off its 39th season poking fun at obama care. >> let me start by saying i am psyched for obama care. >> there you go. i love that enthusiasm. >> because now that i've got free health care, i can get sick all the time. whoo! free medicine, y'all. >> well, that's not really how it works. >> i've stopped washing my hands and i'm licking hella subway poles. thanks, president. >> and former white house press secretary ari fleischer launched a twitter attack with president obama kind of after the president sen

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