Authorities urged thousands of residents in towns outside of New Orleans to flee their homes early Thursday as hurricane-turned-tropical storm Isaac continued to pound the Gulf Coast. More than two feet of rain is expected in some areas by the end of the week, which could cause serious flooding. Isaac, which mostly spared New Orleans, is believed to have triggered three tornadoes overnight in Mississippi and Alabama. And approximately 840,000 people in those states, in addition to Louisiana, Arkansas, and Texas, are without power. President Obama declared a federal emergency in parts of Louisiana and Mississippi late Wednesday.
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