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A tropical cyclone is the generic term for a warm-cored, non-frontal synoptic-scale low-pressure system over tropical or subtropical waters around the world. [4] [5] The systems generally have a well-defined center which is surrounded by deep atmospheric convection and a closed wind circulation at the surface. [4]
Atlantic tropical and subtropical cyclones that reach tropical storm intensity are named from a predetermined list. On average, 14 named storms occur each season, with an average of 7 becoming hurricanes and 3 becoming major hurricanes, Category 3 or higher on the Saffir–Simpson scale .
As of September 2021, there have been 88 tropical cyclones in the off-season, with the most recent being Tropical Storm Ana in May 2021. The first tropical cyclone of the 1938 Atlantic hurricane season, which formed on January 3, became the earliest-forming tropical storm, as post-hurricane reanalysis concluded about the storm in December 2012 ...
Tropical cyclones are characterised by very high wind speeds, heavy rainfall, and storm surges - short-term rises to sea-levels. This often causes widespread damage and flooding. Hurricanes can be ...
The mean tropical year is approximately 365 days, 5 hours, 48 minutes, 45 seconds. An equivalent, more descriptive, definition is "The natural basis for computing passing tropical years is the mean longitude of the Sun reckoned from the precessionally moving equinox (the dynamical equinox or equinox of date).
Due to the number of powerful hurricanes, including long-lived storms like Ernesto and Kirk, the ACE for the 2024 season is 161.6, higher than any of the past three hurricane seasons.
Upper cyclones and the upper troughs that trail tropical cyclones can cause additional outflow channels and aid in their intensification. Developing tropical disturbances can help create or deepen upper troughs or upper lows in their wake due to the outflow jet emanating from the developing tropical disturbance/cyclone. [57] [58]
This is the first time in 27 years that not a single named tropical storm has developed in the basin between Aug. 21 and Sept. 2. ... awareness of its imminent impacts due to heavy rain along the ...
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