World News 8/25: Republican National Convention Preps for Isaac

The RNC start postponed due to severe weather heading for Florida.
3:00 | 08/25/12

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Transcript for World News 8/25: Republican National Convention Preps for Isaac
Good evening I'm David -- ABC news headquarters here in New York where we are following tropical storm Isaac tonight there is a state of emergency in Florida this evening. As the storm now heads its way leaving a trail of destruction behind this is a massive tropical storm 400 miles wide stretching across the Caribbean. Isaac battering Cuba and Haiti today Haiti getting the worst of it to -- mudslides and floods and killing at least three people. And by the time that monster storm reaches Florida it is expected to be a hurricane. So from Miami to Pensacola and of course in Tampa right there -- between the site of the Republican Convention. They are all getting ready and that changes under -- at the convention and we'll get to that in a moment but first ABC's whether editor Sam Champion standing by in Miami with the latest on the storms. -- and good evening. And good evening David are forecast models are -- tighter together so there's a little bit more certainty on what's gonna happen with this storm let's give you a little bit of a time line. As we show you all those models an agreement so by sunrise on Sunday we have tropical storm force winds in South Florida we believe we've got a category one -- hurricane that's moving through the keys the time we get this 5 or 7 o'clock in the morning. And then we believe the next what are the next important points will be. We've got may be a category two storm about a 175. Miles off the coast to tap out. This is capable of pushing a lot of water on that West Coast of Florida it drives by the entire western side delivering storm surge but also very heavy rain. And -- we think they'll be 48 inches of rain in the state of Florida almost -- the entire state of Florida with some pockets getting twelve inches of rain this -- the big storm. To watch David over the next few days. Millions getting ready for this Sam Champion tonight Sam thanks to you also getting ready to Republican Convention. Let's bring her senior political correspondent Jon Karl who has just in Tampa tonight and -- they've already talked about a significant change at least for Monday. -- big change David the commission was to kick off on Monday. Now they're gonna delay the start till Tuesday they'll -- -- -- on Monday but immediately going to recess. The big issue here David is some of these delegates are staying in hotels and how -- away and they -- want them battling torrential rains and high winds. Coming into the convention so now they're gonna delay -- all of the activity. And -- kick it off in a Tuesday four days of convention planning now we'll have to fit -- three days and we continue to. Follow -- security and also of course remembering an American icon as we mentioned earlier today in -- reporting astronaut Neil Armstrong the first man on the moon has died. He was honored for helping realize the dreams of a nation and take a look at this the cover of time magazine back in July 1969. Simply titled. Man on the moon as we remember an American hero tonight. I'm David -- ABC news headquarters here in New York thank you for watching -- Good Morning America first thing in the morning.

This transcript has been automatically generated and may not be 100% accurate.

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