Weakened Irene still big threat

Weakened Irene remains big threat

The storm downshifts to a Category 1, but forecasters expect the worst is yet to come.  

 Entire East Coast on alert 

Also: 

• Hurricane Irene photos
• Visibility from space
• N.C. island evacuation

Irene forces evacuation of N.C. island

It won't be easy to get thousands off Ocracoke Island, which is in the crosshairs of a major hurricane.

Path 

Also: 

• Strengthens to Cat. 3
• 'Magic' date for storms
• Hunters keep close watch