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Hurricane Maria

Category 5 Atlantic hurricane in 2017

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This infrared composite representation of Hurricane Maria was captured during the night of September 19, 2017, at 10:38 P.M. Puerto Rico Local Time (02:38 UTC on September 20), employing the Moderate
NASA Worldview · Public domain

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Through Atmospheric pressure and Convection

Maria developed from a tropical wave on September 16 east of the Lesser Antilles. Steady strengthening and organization took place initially, until favorable conditions enabled it to undergo explosive intensification on the afternoon of September 18, achieving Category 5 strength just before making landfall on the island of Dominica that night. After crossing the island and weakening slightly, Maria re-intensified and achieved its peak intensity with maximum sustained winds of 175 mph (280 km/h) and a pressure of 908 mbar (hPa; 26.81 inHg). On September 20, an eyewall replacement cycle weakened Maria to a high-end Category 4 hurricane by the time it struck Puerto Rico. The hurricane re-emerged weaker from land interaction, but quickly restrengthened back into a major hurricane again the following day. Passing north of the Bahamas, Maria remained a powerful hurricane over the following week as it slowly paralleled the East Coast of the United States, gradually weakening over time as conditions became less favorable. Maria then stalled and swung eastward over the open Atlantic, becoming extratropical on September 30 before dissipating by October 2.

Maria brought catastrophic devastation to the entirety of Dominica, destroying housing stock and infrastructure beyond repair, and practically eradicating the island's lush vegetation. The neighboring islands of Guadeloupe and Martinique endured widespread flooding, damaged roofs, and uprooted trees. Puerto Rico suffered catastrophic damage and a major humanitarian crisis; most of the island's population suffered from flooding and a lack of resources, compounded by a slow relief process. The storm caused the worst electrical blackout in US history, which persisted for several months. Maria also landed in the northeast Caribbean during relief efforts from another Category 5 hurricane, Irma, which crossed the region two weeks prior. The total death toll is 3,059: an estimated 2,975 in Puerto Rico, 65 in Dominica, 5 in the Dominican Republic, 4 in Guadeloupe, 4 in the contiguous United States, 3 in the United States Virgin Islands, and 3 in Haiti. Maria was the deadliest hurricane in Dominica since the 1834 Padre Ruíz hurricane and the deadliest in Puerto Rico since the 1899 San Ciriaco hurricane. This makes it the deadliest named Atlantic hurricane of the 21st century to date. The name Maria was later retired following the 2017 season.

Meteorological history

Maria originated from a tropical wave that left the western coast of Africa on September 12. Gradual organization occurred as it progressed westward across the tropical Atlantic under the influence of a mid-level ridge that was located to the system's north, and by 12:00 UTC on September 16, it had developed into Tropical Depression Fifteen, as deep convection consolidated and developed into curved bands wrapping into an increasingly defined center of circulation. At that time, it was located about 665 mi (1,070 km) east of Barbados. Favorable conditions along the system's path consisting of warm sea surface temperatures of 29 °C (84 °F), low wind shear, and abundant moisture aloft allowed the disturbance to consolidate and become Tropical Storm Maria 6 hours later, after satellite images had indicated that the low-level circulation of the wave had become well-defined.

Maria gradually strengthened, and by late on September 17, although the center had temporarily become exposed, a convective burst over the center enabled it to become a hurricane. Shortly afterward, explosive intensification occurred, with Maria nearly doubling its winds from 85 mph (140 km/h)—a Category 1 hurricane, to 165 mph (270 km/h)—a Category 5 hurricane, in just 24 hours, by which time it was located just 15 mi (24 km) east-southeast of Dominica late on September 18; the rate of intensification that occurred has been exceeded only a few times in the Atlantic since records began. Maria made landfall in Dominica at 01:15 UTC on September 19, becoming the first Category 5 hurricane on record to strike the island nation.

Entering the Caribbean Sea, Maria weakened slightly to a Category 4 hurricane due to land interaction with the island of Dominica, however it quickly restrengthened to a Category 5 hurricane and attained its peak intensity with winds of 175 mph (280 km/h) and a pressure of 908 mbar (hPa; 26.81 inHg) at 03:00 UTC on September 20 while southeast of Puerto Rico; this ranks it as the twelfth-most intense Atlantic hurricane since reliable records began. An eyewall replacement cycle caused Maria weaken to Category 4 strength before it made landfall near Yabucoa, Puerto Rico at 10:15 UTC (6:15 am local time) that day with winds of 155 mph (250 km/h)—the most intense to strike on the island since the 1928 San Felipe Segundo hurricane. Maria weakened significantly while traversing Puerto Rico, but was able to restrengthen to a major hurricane once it emerged over the Atlantic later that afternoon, eventually attaining a secondary peak intensity with winds of 125 mph (201 km/h) on September 22, while north of Hispaniola.

Maria then began fluctuating in intensity for the next few days as the eye periodically appeared and disappeared, while slowly nearing the East Coast of the United States, although southwesterly wind shear gradually weakened the hurricane. By September 25, it passed over cooler sea surface temperatures that had been left behind by Hurricane Jose a week prior, causing its inner core to collapse and the structure of the storm to change significantly. On September 28, a trough that was beginning to emerge off the Northeastern United States swung Maria eastward out to sea, while also weakening to a tropical storm. Periodic bursts of convection near the center managed to maintain Maria's intensity as it accelerated east-northeast across the northern Atlantic Ocean, but interaction with an encroaching frontal zone ultimately resulted in the storm becoming an extratropical cyclone on September 30, which continued east-northeastward, before dissipating on October 2.

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