Hurricane Ernesto strengthens to Category 2 storm as it heads north towards Bermuda. The storm, with winds at 100 mph, has left hundreds of thousands without power in Puerto Rico. A hurricane warning is in effect for Bermuda, with Ernesto expected to bring heavy rain. The storm may reach Category 3 strength before weakening near Bermuda and is predicted to pass near Atlantic Canada. Thousands in Puerto Rico remain without power and water, with concerns about health issues.