<Tr> <Td_colspan="2"> Part of the 2017 Atlantic hurricane season </Td> </Tr> <P> Hurricane Maria is regarded as the worst natural disaster on record in Dominica and Puerto Rico . The tenth-most intense Atlantic hurricane on record and the most intense tropical cyclone worldwide of 2017, Maria was the thirteenth named storm, eighth consecutive hurricane, fourth major hurricane, second Category 5 hurricane, and the deadliest storm of the hyperactive 2017 Atlantic hurricane season . At its peak, the hurricane caused catastrophic damage and numerous fatalities across the northeastern Caribbean, compounding recovery efforts in the areas of the Leeward Islands already struck by Hurricane Irma . Maria was the third consecutive major hurricane to threaten the Leeward Islands in two weeks, after Irma made landfall in several of the islands two weeks prior and Hurricane Jose passed dangerously close, bringing tropical storm force winds to Barbuda . Maria is also the third - costliest tropical cyclone on record with a total of roughly $100 billion in damages; only hurricanes Katrina (2005) and Harvey from earlier in the season inflicted more damage, respectively . </P> <P> Originating from a tropical wave, Maria became a tropical storm on September 16, east of the Lesser Antilles . Highly favorable environmental conditions allowed the storm to undergo explosive intensification as it approached the island arc . The hurricane reached Category 5 strength on September 18 just before making landfall on Dominica, becoming the first Category 5 hurricane on record to strike the island . After weakening slightly due to crossing Dominica, Maria achieved its peak intensity over the eastern Caribbean with maximum sustained winds of 175 mph (280 km / h) and a pressure of 908 mbar (hPa; 26.81 inHg), making it the tenth-most intense Atlantic hurricane on record . On September 20, an eyewall replacement cycle took place, weakening Maria to a high - end Category 4 hurricane by the time it struck Puerto Rico . Interaction with land further weakened the hurricane, though it regained some strength as it moved northeast of The Bahamas . Moving slowly to the north, Maria gradually degraded and weakened to a tropical storm on September 28 . Embedded in the westerlies, Maria accelerated toward the east and later east - northeast over the open Atlantic, becoming extratropical on September 30 and dissipating by October 3 . </P> <P> As of November 20, at least 547 people were killed by the hurricane: 499 in Puerto Rico, 31 in Dominica, 5 in the Dominican Republic, 4 in the contiguous United States, 3 in Haiti, 2 in Guadeloupe, and 3 in the United States Virgin Islands . Dozens of others, mostly in Dominica and Puerto Rico, are still missing . The death toll in Puerto Rico is believed to be far higher than the official toll of 58, with estimates of the actual loss of life ranging from 500 to more than 1,000 . Maria wrought catastrophic damage to the entirety of Dominica, which suffered an island - wide communication blackout . Much of the housing stock and infrastructure were left beyond repair, while the island's lush vegetation had been practically eradicated . The islands of Guadeloupe and Martinique endured widespread flooding, damaged roofs and uprooted trees . Puerto Rico suffered catastrophic damage, including destruction of its previously damaged electrical grid . For weeks in Maria's wake, most of the island's population suffered from flooding and lack of resources, compounded by the slow relief process . Total losses from the hurricane vary wildly but are estimated at upwards of $99.45 billion (2017 USD), mostly in Puerto Rico . </P>

When did hurricane maria occur in puerto rico