Published: Aug 24, 2011 1:10 PM EDT
Updated: Jun 27, 2012 9:38 PM EDT

MIAMI (AP) - Hurricane Irene has strengthened to a major Category 3 storm as it heads toward the East Coast.
 
The U.S. National Hurricane Center in Miami says Irene's maximum sustained winds have increased Wednesday to near 115 mph  with additional strengthening forecast during the next day or so.
 
Meanwhile, evacuations have begun on a tiny barrier island off North Carolina early Wednesday in a test of whether people in the crosshairs of the first serious hurricane along the East Coast in years will heed orders to get out of the way.
 
Irene is centered about 335 miles  southeast of Nassau in the Bahamas and is moving west-northwest near 9 mph.