List of South Atlantic tropical and subtropical cyclones
Open-knowledge reference entry
This article documents all South Atlantic tropical cyclones that have been recorded. Tropical cyclone formation is rare in the South Atlantic due to multiple limiting factors, such as relatively low sea surface temperatures, strong wind shear typically being present across the basin, and a lack of disturbances from the intertropical convergence zone that could form into tropical cyclones. Due to this sheer rarity, South Atlantic tropical cyclones weren’t recorded until the 1970s, as weather and satellite technology at the time weren't advanced enough to detect the majority of these systems. Since 2011, South Atlantic tropical cyclones have been assigned names from a list of names provided by the Brazilian Navy.
Summary
Pre–2000
According to a presentation at the Sixth WMO International Workshop on Tropical Cyclones (IWTC-VI), satellite imagery from January 1970 showed that a system with an eyewall had developed behind a cold front and that the system needed further analysis to determine if it was tropical or subtropical.
On 27 March 1974, a weak area of low pressure that had originated over the Amazon River started to intensify further. Over the next 48 hours the system quickly developed further and was classified as subtropical, as it developed a banding structure and deep convection near its warm core. On 29 March, a north-westerly flow encroached on the systems environment, which caused the system to rapidly move towards 40S and the cold waters that were present to the south of 40°S.
On April 10, 1991, a low-pressure system formed off the coast of Angola, which developed into a tropical depression on the 11th. By the morning of April 12, the cyclone had intensified into a tropical storm, reaching its peak intensity on the 13th. On the 15th, it weakened to a tropical depression, which eventually weakened to a remnant low and dissipated on the 16th.
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This entry incorporates text from “List of South Atlantic tropical and subtropical cyclones” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.