Isaac to Bring a Lot of Rainfall

Dr. Rick Knabb discusses the dangers of the storm barreling down on the Gulf Coast.
3:00 | 08/28/12

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Transcript for Isaac to Bring a Lot of Rainfall
And , for more, we're joined by dr. Rick nab. He's the director of the national hurricane center in miami. When you look at the most recent models, what does it tell you about the severity and the timing of isaac? One of the things that concerns me is not only is isaac getting stronger, slowly, we think it's going to become a hurricane today. Is that it's a large system. And the models show the forward speed slowing down. And that's not good. When a large system moves slowly, th means a lot of rainfall. So, as this moves onshore, it's going to bring tremendous amounts of rain. Maybe locally up to 20 inches. And a large tropical storm or hurricane, is far more able to produce a lot of storm surge, pushing the water into the area near the mississippi coast and southeast louisiana. Also, over to alabama and farther west of new orleans and louisiana. So, hopefully folks took their preparations yesterday very seriously. And are ready to stay off the roads and be out of flood zones today. As the storm moves ashore, perhaps, by tonight. And you still -- can you pinpoint any clearer right now? I know there's a lot of time before it makes landfall. But can you kind of narrow it down a little bit where you think it may come across. Our cone of uncertainty gets narrower as the center gets closer to the coastline. Still, at this moment, can't pinpoint exactly where the center is going to go. With a large system like isaac, the exact center location isn't as critical as if it were a small, defined eye. A lot of watter erwater is coming in. And a lot of water from the coast, and inland. Isaac is not just going to be a coastal event. River flooding and inland flooding for hundreds of miles. Dr. Knabb, I know you have a busy day ahead of you. Thank you for spending some time

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

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