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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.
But now to Tampa, where this evening Mitt Romney will formally accept his party's nomination for president.
Last night, though, the stage belonged to vice presidential nominee Paul Ryan. In a campaign, it often falls to the running mate to be the attack dog and Ryan sounded up for the job. It was also a chance for the rising GOP star to defend his own ideas.
Turkey's foreign minister is in New York today. He's urging the United Nations to begin sheltering and protecting refugees inside Syria. It's a move that would almost certainly require international military involvement to safeguard an area inside the country. But Syrian President Bashar al-Assad says talk of a safe zone inside his country is not practical. NPR's Peter Kenyon has this report from Istanbul.