(CAIBARIEN, Cuba) — A deadly Hurricane Irma scraped Cuba’s northern coast Friday on a course toward Florida, leaving in its wake a ravaged string of Caribbean resort islands strewn with splintered lumber, corrugated metal and broken concrete. The death toll stood at 21 and was expected to rise as rescuers reached some of the hardest-hit areas. And a new danger lay on the horizon to the east: Hurricane Jose, a Category 4 storm with 150 mph winds that could punish some of the devastated areas all over again this weekend. “I don’t think it takes a rocket scientist to know that further damage is imminent,” said Inspector Frankie Thomas of the Royal Police Force of Antigua and Barbuda. Irma weakened from a Category 5 to a still-fearsome Category 4 on Friday morning with winds of 155 mph (250 kph). The hurricane smashed homes, schools, stores, roads and boats on Wednesday and Thursday as it rolled over islands long known as turquoise-water playgrounds of the rich, including St.