Abstract:
There will be more extreme climatic phenomena in the years to come because of warming, in
fact, each year several extreme climatic phenomena affect the planet. they are more and more
violent. This research aims to determine the thresholds and alert levels for strong winds in Benin
Wind data and meteorological phenomena observations extracted from different sources on the
Cotonou (1981–2016) and Parakou (1981–2015) and Kandi (1970–1987) stations and the
economic and socio – anthropological data collected on different localities are used to establish
the thresholds and alert levels relating to the risk of strong wind in Benin.
Over the periods considered, it appears that the strong winds, mainly from the sector, are linked
to the passage of Meso-Scale Convective Systems (SCME) with speeds of up to 33 m: s-1 (118
km: h-1). They are often accompanied by moderate to heavy rainfall – thunderstorms. Their
annual frequency is low (less than 1%). The damage they cause includes ruffling buildings and
destroying crops. Their classification was the subject of a vigilance table indicating the
thresholds and alert levels selected. It locates extreme strong wind events leading to exceptional
damage at a speed threshold greater than 23 m: s-1 (82 km: h-1) with return periods greater than
5 years. Below this threshold are the manifestations of strong wind causing damage with medium
recurrence.
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