 Hurricane Beryl has become the first Atlantic storm ever to reach the powerful Category 4 in June. And as NPR's Rebecca Herscher reports, the storm gained strength extremely fast. Beryl threatens to bring dangerous wind and flooding to Barbados and the Windward Islands, forecasters warn. Category 4 storms have winds of 130 miles an hour or more, which can rip the roof off many buildings. The storm gained strength very quickly. In less than two days, its maximum wind speed increased by about 75 miles per hour.