Consultation de l'archive HANSELLA


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Informations générales

HANSELLA  Cyclone tropical, saison 1995/1996

Le système HANSELLA a été baptisé le 03.04.1996 à 06 UTC, il a atteint le stade de Cyclone tropical.
Le vent soutenu en mer a atteint 176 km/h avec des rafales atteignant 218 km/h.
Deux îles ont été touchées par ce système.



Identité du Système

Date de la cyclogénèse
02.04.1996 à 00 UTC
Zone de la cyclogénèse
Nord-Est du bassin (70°/90°E)
Date du baptême
03.04.1996 à 06 UTC
Date de la dissipation
11.04.1996 à 06 UTC
Type de trajectoire
FREEBOOTER
Durée de vie
9 Jours
Durée de vie au stade de Dvorak supérieur à 2,5/8,0
5 Jours
Durée de vie au stade tempête
69 Heures
Durée de vie au stade Cyclonique
36 Heures
Distance parcourue
2782 km
Vitesse moyenne de déplacement
13.0 km/h, 7 Kt
ZONE DE LA CYCLOLYSE
TROPICALE


Les différents stades atteints par HANSELLA


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Stades atteints Date de l'évolution Mention  
Perturbation tropicale
02.04.1996 à 00 UTC
L'intensité augmente
Dépression tropicale
04.04.1996 à 00 UTC
l'intensification réelle, commence ici. L'intensité augmente
Tempête tropicale modérée
04.04.1996 à 12 UTC
L'intensité augmente
Forte tempête tropicale
05.04.1996 à 12 UTC
L'intensité augmente
Cyclone tropical
06.04.1996 à 03 UTC
c'est au moment de son passage sur l'île Rodrigues, que Hansella a atteint le stade cyclonique ! L'intensité augmente
Forte tempête tropicale
07.04.1996 à 18 UTC
L'intensité diminue
Tempête tropicale modérée
08.04.1996 à 12 UTC
L'intensité diminue
Dépression tropicale
09.04.1996 à 00 UTC
la dépression fait route vers l'Ouest, et se comblera sur les côtes Réunionnaises, en y apportant des pluies bénéfiques. L'intensité diminue


Valeurs maximales

Valeurs maximales atteintes par HANSELLA, le 06 avril 1996 à 12 UTC  
Intensité sur l'échelle de Dvorak (nombre Ci) 5,0+/8,0
Intensité sur la classification Australienne 3/5
Pression estimée au centre 949 mb
Vent moyen sur 10 mn (donnée Météo-France) 120 Km/h, 65 Kt
Vent moyen sur 1 mn (donnée Météo-France) 139 Km/h, 75 Kt
Vent moyen sur 1 mn (donnée JTWC) 176 Km/h, 95 Kt
Rafales 218 Km/h, 118 Kt
Vent moyen sur 1 mn (intensité atteinte la plus probable) 176 Km/h, 95 Kt


Tableau des impacts sur les îles


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Îles
Distance et intensité correspondante
Date
Alerte
Rodrigues Sur l'île, au stade de cyclone tropical (s'intensifiant) 06.04.1996 à 03 UTC de classe 4 (maxi)
Réunion 10 km à l'Ouest, au stade perturbation tropicale (se comblant) 10.04.1996 à 22 UTC non renseigné
 

Conclusion

On peut dire que l'île Rodrigues depuis 2 ans à le mauvais œil ! En effet 8 systèmes ont intéressé l'île. Le centre du cyclone Hansella passe directement sur cette petite île de l'océan Indien ! Je rappel que l'île Rodrigues a une superficie de 109 km2 seulement ! Une tête d'épingle dans l'immensité de l'océan Indien qui quand à lui a une superficie de 75 millions de km2 ! Des rafales proches de 180 km/h sont ainsi mesurées. Cf aux images satellites où on voir l'île Rodriques dans l’œil du cyclone.



Images du système


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Trajectoire d'Hansella de type freebooter.
Source : Firinga le site
Hansella - Le 06 avril 1996 à 02 UTC - NOAA 12, image impressionnante et rarissime où l'île Rodrigues est dans l'œil du cyclone Hansella, qui atteint à ce moment le tout premier stade cyclonique
Source : Image provenant de Météo-France Réunion
Hansella - Le 06 avril 1996 à 02 UTC - NOAA 12, image impressionnante et rarissime où l'île Rodrigues est dans l'œil du cyclone Hansella, qui atteint à ce moment le tout premier stade cyclonique
Source : Image provenant de Météo-France Réunion
Hansella - Le 06 avril 1996 à 09:39 UTC - NOAA 14 - Hansella quelques heures après son passage sur l'île Rodrigues, Hansella s'éloigne au SE au maximum de son intensité. Constatez l'épanchement des cirrus au-dessus du Cyclone, traduisant la persistance de bonnes conditions divergences en altitude
Source : Image provenant de Météo-France Réunion

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