Hurricanes that are strengthening with extraordinary rapidity

DECRYPTION – The effect of global warming could intensify the phenomenon.

Gusts of over 240 km / h (277 km / h measured at Port Fourchon), veritable walls of water pouring into the streets of New Orleans… Hurricane Ida, classified in category 4 on the scale of Saffir-Simpson which has 5, hit Louisiana head-on Sunday, sixteen years after Katrina. Its peculiarity is that it strengthened very quickly, drawing all its power from the warm waters of the Gulf of Mexico and catching the authorities by surprise. A phenomenon that tends to grow over the years, according to Régis Crépet, meteorologist at the Weather Channel *.

Of course, he recalls, hurricanes do not seem to be more numerous than before, at least as far as the North Atlantic is concerned: there were a lot of them in the 1970s and 1990s, the two record years being 2005. (with Katrina in particular) and 2020 which each recorded 28 phenomena. On the other hand,“For a decade, we have noticed that when they form, hurricanes grow in intensity with extraordinary rapidity,

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