GASITAO  Cyclone tropical très intense, saison 1987/1988

Le système GASITAO a été baptisé le 16.03.1988 à 12 UTC, il a atteint le stade de Cyclone tropical très intense.
Le vent soutenu en mer a atteint 278 km/h avec des rafales atteignant 345 km/h.
Aucune île n'a été concernée par ce système.


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- Super cyclone Gasitao vu en IR par Noaa 10 le 18 mars 1988 à 15:18 UTC - Constatez la divergence qui est impressionnante, l'oeil de 30 km de diamètre est parfaitement circulaire et centrale dans la masse nuageuse compact. Un monstre de puissance ! Dans le mur de l'oeil, les vents en mer sont estimés à 140 kt soit 259 km/h (sur 1 min) avec des rafales à 322 km/h. Fort heureusement aucune terre habitée ne se trouve sur le chemin de ce météore. Source : Merci à Karl HOARAU pour l'image !

Les différents stades atteints par GASITAO

Passez le pointeur de la souris sur le tableau pour afficher des détails le cas échéant.
: L'intensité augmente : L'intensité diminue

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Stades atteints
Date de l'évolution
Perturbation tropicale
15.03.1988 à 12 UTC
L'intensité augmente
Dépression tropicale
16.03.1988 à 00 UTC
L'intensité augmente
Tempête tropicale modérée
16.03.1988 à 12 UTC
L'intensité augmente
Forte tempête tropicale
17.03.1988 à 06 UTC
L'intensité augmente
Cyclone tropical
17.03.1988 à 18 UTC
L'intensité augmente
Cyclone tropical intense
18.03.1988 à 06 UTC
L'intensité augmente
Cyclone tropical très intense
19.03.1988 à 00 UTC
L'intensité augmente
Cyclone tropical intense
19.03.1988 à 12 UTC
L'intensité diminue
Cyclone tropical
21.03.1988 à 00 UTC
L'intensité diminue
Forte tempête tropicale
22.03.1988 à 00 UTC
L'intensité diminue
Tempête tropicale modérée
22.03.1988 à 12 UTC
L'intensité diminue
Dépression tropicale
23.03.1988 à 06 UTC
L'intensité diminue
Dépression extra-tropicale
23.03.1988 à 18 UTC
L'intensité diminue

Valeurs maximales

Valeurs maximales atteintes par GASITAO, le 19 mars 1988 à 00 UTC  
Intensité sur l'échelle de Dvorak (nombre Ci) 7,5-/8,0
Intensité sur la classification Australienne 5/5
Pression estimée au centre 900 mb
Vent moyen sur 10 mn (donnée Météo-France) 170 Km/h, 92 Kt
Vent moyen sur 1 mn (donnée Météo-France) 195 Km/h, 105 Kt
Vent moyen sur 1 mn (donnée JTWC) 241 Km/h, 130 Kt
Rafales 345 Km/h, 186 Kt
Vent moyen sur 1 mn (intensité atteinte la plus probable) 278 Km/h, 150 Kt

 

 
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L'analyse par Karl HOARAU

   

Le cyclone Gasitao a atteint le 20ème parallèle sud au stade de cyclone très intense le 20 mars 1988 à 22h30 UTC loin à l'Est de Rodrigues vers 70°E.

Et pourtant la température de la mer était moins chaude que dans les parages des Mascareignes.

Sur l'image satellitaire en infrarouge, l'oeil reste chaud mais la masse nuageuse a un peu perdu de sa symétrie. La divergence a perdu aussi de sa superbe par rapport au maxi d'intensité 8 heures plus tôt vers 17.5°S.

Sur l'image en palette de Dvorak, les données satellitaires sont encore à 7.0 avec une ceinture White (en blanc, sommets nuageux plus froids que -70°C).

Gasitao reste le seul cyclone de cette partie de l'océan Indien à avoir atteint au moins 140 noeuds en franchissant 20°S depuis l'existence d'images en IR renforcé exploitables.

Source : Karl HOARAU

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