NEW : Ana is 40 mph east of Virgin Islands , moving west at 17mph . Puerto Rico , Virgin Islands advised to monitor storm 's progress . Storm has maximum sustained winds of 17mph , hurricane center says .
NEW : Ana is 730 miles east of Leeward Islands , moving west at 17mph . Virgin Islands , Puerto Rico advised to monitor storm 's progress . Storm has maximum sustained winds of 40 mph , hurricane center says .