 Live from NPR News in Washington, I'm Nora Rahm. Hurricane Burl, the first hurricane of the season, has strengthened to a dangerous Category 4 storm. NPR's Amy Held reports it's getting stronger as it barrels towards the southeastern Caribbean islands, where it's expected to reach tomorrow. Barbados, St. Lucia, St. Vincent and the Grenadine Islands are among the places under hurricane warnings as the region begins to shut down and officials tell residents to take shelter.