Hurricane Irma is a Category 5 storm and a "dangerous major hurricane," according to the National Weather Service. Longtime observers have been shocked by its power and have warned that it could be one of the most infamous storms in Atlantic hurricane history. "Irma has me sick to my stomach," Eric Blake, a scientist at the National Hurricane Center, wrote in a Twitter message. "This hurricane is as serious as any I have seen. No hype, just the hard facts. Take every life saving precaution you can."