Hurricane Maria took forecasters by surprise earlier this week with how quickly it strengthened. In little more than 24 hours, it transformed from a tropical storm to a Category 5 hurricane. It struck the small islands of Guadeloupe and Dominica in full fury on Monday. On Dominica, reports indicated at least 15 people had died and 90 percent of buildings were damaged. After battering St. Croix, one of the U.S. Virgin Islands, Maria reached Puerto Rico as a Category 4 hurricane. It was one of the strongest hurricanes to ever hit the island.
Hurricanes are powerful storms that draw energy from warm ocean waters. They are ranked in categories from 1 to 5 based on wind speed. Category 1 is the weakest, with steady winds of 74 to 95 miles per hour. Category 5 is the strongest, with winds reaching 157 miles per hour or higher.
This year’s hurricane season, which typically lasts from June to November, is already one of the most active on record. So far, 2017 has seen seven hurricanes of Category 3 or higher.