Hurricane Irma has been upgraded to an "extremely dangerous" and "life-threatening" Category 5 storm this morning.The storm is packing sustained winds of 175 mph as it swirls across the Atlantic toward Puerto Rico and the British and U.S. Virgin Islands.Storm-force winds are forecast to begin impacting those areas tomorrow.The National Hurricane Center says it's still too early to tell if Irma will strike the continental United States; however, the Florida Keys and peninsula could feel some impacts later this week.