Also during the month was a rare subtropical storm in the South Atlantic named Mani, although it drifted well away from land. Overall, there were 22 named storms in the basin in 2020, which was slightly below the norm of 27. The season's first cyclone developed on May 16, and activity was unprecedented after Arthur formed, with an additional off-season storm forming having been named Tropical Storm Bertha. In the Australian region, one low formed which started the 2020–21 Australian region cyclone season which crossed the South-West Indian Ocean basin and intensified into a cyclone which was later named Bongoyo. The system reached its peak intensity with winds of 35 mph (55 km/h) and a pressure of 1008 mbar (29.77 inHg) around 00:00 UTC on August 1. A near-concurrent pass from another satellite showed lower winds and the higher winds were determined to be rain-inflated, and given the conflicting data the NHC determined the system to have not become a tropical storm. Its unusual rapid intensification over cool sea surface temperatures and moderate wind shear was unprecedented by forecasters and was also the farthest east any tropical cyclone had rapidly intensified this late in an Atlantic hurricane season. The North Atlantic mainly contributed to most development in the month and continued its record breaking season with the development of Hurricanes Nana, Paulette, Sally, and Teddy, and (Sub)Tropical Storms Omar, Rene, Vicky, Wilfred, Alpha, and Beta. As 2020 began, sea surface temperatures were above normal in the eastern Pacific Ocean near the equator, which had the potential to develop into El Niño conditions. [81][82] In coastal South Carolina, there was localized flash flooding,[80][83] and one person drowned due to rip currents at Myrtle Beach. [178] The warning was discontinued at 21:00 UTC on September 8. In the North Indian Ocean the season resumed activity with Gati forming off the coast of Somalia in the Arabian Sea which explosively intensifying into a Category 3 equivalent tropical cyclone, becoming the strongest tropical cyclone to ever make landfall in Somalia. Operationally, it was not named until 16:00 UTC, when a hurricane hunter aircraft investigating the storm found a well-defined low-level circulation (LLC), allowing the NHC to name the system Nana. [106], Although the system moved westward across the Cabo Verde Islands, little rainfall was recorded as the disturbance had a limited amount of convection. [290], As Epsilon began moving away from Bermuda on October 23, the tropical storm warning was cancelled. August concluded with a tropical depression which intensified into Tropical Storm Omar on September 1. Residents at risk were evacuated. After fifteen years, the 2020 Atlantic hurricane season has surpassed record high activity in terms of named storms. Nana quickly weakened, falling to a tropical depression at 18:00 UTC. Afterwards, a record-breaking ten storms developed in the month of September. The floods killed one person in Praia on September 12. The season concluded on November 19 with the dissipation of Tropical Storm Polo, which briefly existed for around 2 days prior. Location: Puducherry, Tamil Nadu. Featuring only seventeen tropical storms (sixteen received names), four hurricanes, and three major hurricanes, the 2020 Pacific hurricane season was the least active season in exactly a decade. Very dry air from the Saharan Air Layer prevented further intensification, while westerly to northwesterly wind shear increased to about 23 mph (37 km/h) by September 19. [151] The storm produced heavy downpours upon Puerto Rico and Hispaniola. [262] By 15:20 UTC on October 6, a Hurricane Hunters reconnaissance aircraft found that the system had continued to rapidly intensify into a Category 4 major hurricane with maximum sustained winds near 130 mph (210 km/h). It became the least active season since the 2016–17 season with only three systems intensified further into severe tropical cyclones, and three systems made landfall within the region at tropical cyclone intensity. It is only calculated for full advisories on specific tropical and subtropical systems reaching or exceeding wind speeds of 39 mph (63 km/h). NOAA (Hurricane Research Division). It went on to strengthen into a super cyclonic storm, being designated Super Cyclonic Storm Amphan, and make landfall in India three days later, becoming the costliest storm ever recorded in the basin. August saw the formations of tropical storms Josephine and Kyle, and hurricanes Laura and Marco. Use of this naming protocol had only happened once before, in 2005. 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