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"description": "After a long and meandering journey over Central America, across central Cuba, and through the Florida Keys, Eta, the 28th named storm and 12th hurricane of the 2020 Atlantic hurricane season, wound up nearly stationary as a moderate tropical storm in the southeastern Gulf of Mexico just north of the western tip of Cuba on the morning of November 10th. Before long however, a deep layer trough located over the western third of the US began to shift eastward, and by the afternoon of the 10th, it started to pull Eta back towards the north and the west coast of the Florida peninsula. As it did so, a combination of warm waters and northwesterly wind shear meant that Eta essentially maintained its intensity as a moderate tropical storm. But by the evening of the 10th, as the northwesterly wind shear abated, Eta began to strengthen, becoming a strong tropical storm overnight. At 7:35 a.m. EST on the morning of November 11, the National Hurricane Center (NHC) reported that Eta had once again become a hurricane.\r
\r
It was just after this time that the NASA / JAXA GPM Core Observatory satellite flew over Eta once again, after having observed the storm over Nicaragua on November 3 and the Florida Keys on November 8. The above animation shows yet another detailed look into Eta's precipitation courtesy of GPM, which overflew the storm at 9:11 a.m. EST (14:11 UTC) on November 11.
Rainfall rates derived from the GPM Microwave Imager (GMI) and Dual-frequency Precipitation Radar (DPR) show all of Eta’s heavy rainbands (in red and orange) wrapping around mainly the eastern and northern sides of the storm. Tall cloud towers associated with areas of deep convection (in blue), where the DPR detected frozen precipitation particles extending upward within these thunderstorms, are located north and east of the center. Eta’s overall asymmetric structure is consistent with a storm still in the process of maturing.
However, Eta would not be a hurricane for long, as dry air weakened Eta back to a tropical storm by the early afternoon. The combination of increasing wind shear, cooler waters and Eta’s close proximity to land meant that Eta made landfall as a moderate tropical storm with sustained winds reported at 50 mph by National Hurricane Center (NHC) when it crossed the Florida coast near Cedar Key around 4:00 a.m. EST on November 12.
At the time of GPM's overpass, Eta was a low-strength hurricane with maximum sustained winds reported at 75 mph by NHC.\r
GPM data is archived at https://pps.gsfc.nasa.gov/",
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The unusually high frequency and strength of these tropical storms were linked to favorable development conditions observed in the ocean and atmosphere between the Caribbean Sea and west coast of Africa where they form. Easterly winds blowing off the African continent seeded the Atlantic with a large number of proto-hurricanes—swirling air masses that grow over tropical waters. Ideal open ocean wind patterns on the surface and high above permitted storm clouds to easily mature into vigorous convective cells—the building blocks of hurricanes. Warmer ocean surface waters slightly above their 80 degrees Fahrenheit average further strengthened the storms and sent the spinning hurricanes into overdrive. 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