The-Cyclone-Freddy-in-The-Southwest-Indian-Ocean-(2022-2023-Cyclone-Season)

Abstract

Fanja-Tahina-RALINIRINA

The-conditions-for-the-formation-of-cyclones-formulated-by- Palmen,-cited-by-G.-Donque,-are-present-in-the-southwest- Indian-Ocean.-The-first-frequent-formation-area-is-in-the-center- of-the-Indian-Ocean,-at-the-level-of-Agalega-and-near-Diego- Garcia.-These-cyclones-move-from-east-to-west-and-cross- the-extreme-north-of-the-island-to-exit-into-the-Mozambique- Channel:-this-type-of-trajectory-represents-14%-of-the- trajectories-from-1959-89.-Cyclones-with-this-type-of-trajectory- appear-at-the-beginning-of-the-austral-summer:-from-October-to- December.-The-second-preferred-formation-area-in-the-Indian- Ocean-is-near-the-island-of-Tromelin,-where-cyclones-enter-the- east-coast-south-of-Toamasina.-In-this-case,-cyclones-can-climb- the-eastern-slope,-cross-the-Highlands-south-of-Antananarivo,- and-exit-the-island-between-Morondava-and-Toliara.-This-type- of-trajectory-represents-12%-of-the-trajectories-from-1959-89.- A-third-type-of-trajectory-was-observed-entering-Madagascar- at-Mananjary-to-exit-near-Faux-Cap.-They-represent-9%-of- cyclones-from-1959-89,-and-a-fourth-type-of-trajectory-only- concerns-the-east-coast-of-Madagascar,-where-cyclones-run- along-the-eastern-slope-to-exit-on-the-side-of-Farafangana- (9%)-or-by-taking-a-maritime-trajectory-off-the-east-coast- (22%).-Currently,-the-first-type-of-trajectory-remains-the-most- important.-Out-of-24-cyclones-born-in-the-Indian-Ocean,- 7/24-have-this-first-type-of-trajectory.-The-second-type-has- occurred-only-twice,-2/24,-the-third-type-only-once,-1/24-in-20- years.-However,-the-fourth-type-of-trajectory-is-still-the-most- followed-by-cyclones,-with-a-frequency-of-7/24.

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