Now, as Isaac moves north from Louisiana, it could affect other parts of the country, and we'll be following that story as it develops.
The other big story we have been following this week is the Republican National Convention in Tampa, Florida. Today is the final day, and it's an important one for GOP presidential nominee Mitt Romney. He'll officially accept the nomination this evening. Yesterday, Romney took a break from the hubbub of the convention to do a little campaigning elsewhere. NPR's Ari Shapiro reports on his getaway.
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It is the wind that defines the strength of a hurricane. The storm is not a hurricane at all until the wind reaches 74 miles per hour. Hurricane Isaac's sustained winds were not much beyond that, so it was a Category 1 storm, not two, three, four or five. But if the winds define a hurricane, it's the water that can do the most damage.
Just to keep us up to date here on Hurricane Isaac, it's become a tropical storm and forecasters expect to downgrade it to a tropical depression by this evening. That is small comfort, though, to people facing the storm's strong winds and heavy rains. States as far north as Ohio could feel Isaac's effects.