Consultation de l'archive EDWINA


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Informations générales

EDWINA  Cyclone tropical intense, saison 1992/1993

Le système EDWINA a été baptisé le 20.01.1993 à 06 UTC, il a atteint le stade de Cyclone tropical intense.
Le vent soutenu en mer a atteint 204 km/h avec des rafales atteignant 253 km/h.
Trois îles ont été touchées par ce système.



Identité du Système

Date de la cyclogénèse
16.01.1993 à 00 UTC
Zone de la cyclogénèse
Zone Australienne (90°/110°E)
Date du baptême
20.01.1993 à 06 UTC
Date de la dissipation
30.01.1993 à 00 UTC
Type de trajectoire
PERPENDICULAIRE
Durée de vie
14 Jours
Durée de vie au stade de Dvorak supérieur à 2,5/8,0
10 Jours
Durée de vie au stade tempête
84 Heures
Durée de vie au stade Cyclonique
132 Heures
Distance parcourue
4344 km
Vitesse moyenne de déplacement
19.0 km/h, 10 Kt
ZONE DE LA CYCLOLYSE
POLAIRE


Les différents stades atteints par EDWINA


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Stades atteints Date de l'évolution Mention  
Dépression tropicale
19.01.1993 à 12 UTC
L'intensité augmente
Tempête tropicale modérée
20.01.1993 à 00 UTC
L'intensité augmente
Forte tempête tropicale
22.01.1993 à 12 UTC
L'intensité augmente
Cyclone tropical
23.01.1993 à 09 UTC
L'intensité augmente
Cyclone tropical intense
25.01.1993 à 06 UTC
L'intensité augmente
Cyclone tropical
28.01.1993 à 00 UTC
L'intensité diminue
Dépression extra-tropicale
29.01.1993 à 00 UTC
Le système s'affaiblit rapidement dans la nuit du 28 au 29 suite à un cisaillement en altitude. Le 02 février le résidu du système est repris dans la circulation polaire en direction de la Nouvelle Amsterdam. L'intensité diminue


Valeurs maximales

Valeurs maximales atteintes par EDWINA, le 26 janvier 1993 à 06 UTC  
Intensité sur l'échelle de Dvorak (nombre Ci) 5,5+/8,0
Intensité sur la classification Australienne 4/5
Pression estimée au centre 932 mb
Vent moyen sur 10 mn (donnée Météo-France) 172 Km/h, 93 Kt
Vent moyen sur 1 mn (donnée Météo-France) 204 Km/h, 110 Kt
Vent moyen sur 1 mn (donnée JTWC) 204 Km/h, 110 Kt
Rafales 253 Km/h, 137 Kt
Vent moyen sur 1 mn (intensité atteinte la plus probable) 204 Km/h, 110 Kt


Tableau des impacts sur les îles


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Îles
Distance et intensité correspondante
Date
Alerte
Rodrigues 240 km au Nord-Ouest, au stade de cyclone tropical intense (stable) 26.01.1993 à 10 UTC non renseigné
Maurice 215 km à l'Est au stade de cyclone tropical intense (s'affaiblissant) 27.01.1993 à 06 UTC non renseigné
Réunion 390 km au Sud-Est, au stade de cyclone tropical intense (s'affaiblissant) 27.01.1993 à 15 UTC Alerte n°1 (Vigilance cyclonique)

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Cyclone dit "annulaire"

Quelques une des conditions associées avec un cyclone annulaire :

– une intensité de 85% ou plus par rapport à leur potentiel d’intensité maximum
– un faible cisaillement
– un vent froid à très haute altitude (au niveau de pression 200 hPa)
– une température de la mer constante comprise entre 24,5°C et 28,5°C
– un manque de “relative eddy flux convergence ” au niveau de pression 200 hPa


Conclusion

Edwina a vécu plus de 10 jours comme système tropical. Cette valeur constitue le record de longévité de la saison. Edwina et Jourdanne sont les 2 systèmes les plus puissants de cette saison.

A noter que du 19 au 21 janvier, ont coexisté sur la zone, trois systèmes dépressionnaires tropicaux. A savoir le cyclone Colina, et les tempêtes modérées Dessilia et Edwina.



Images du système


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Trajectoire d'Edwina
Source : Trajectoire provenant du site de Australia Severe Weather
Edwina le 24 janvier 1993 à 11:26 UTC - L’œil est parfaitement circulaire et pur, il a un diamètre de 80 km et la masse nuageuse 560 km. Le centre est positionné à 890 km de Port Mathurin (Rodrigues). Dans le mur de l’œil, les vents en mer sont estimés à 105 kt soit 195 km/h (sur 1 min) avec des rafales à 241 km/h
Source : Image Noaa 11, provenant de NOAA - NCDC
Le 25 janvier 1993 à 01:20 UTC. Cyclone tropical intense EDWINA
Source : Satellite à défilement NOAA 10, par Météo-France Réunion
Cyclone tropical intense Edwina - Le 26 janvier 1993 à 02:33 UTC - Traitement fausses couleurs - Dans le mur de l’œil, les vents en mer sont estimés à 100 kt soit 185 km/h (sur 1 min) avec des rafales à 230 km/h
Source : Image NOAA 10, provenant de Météo-France Réunion
Cyclone tropical intense Edwina - Le 26 janvier 1993 à 02:33 UTC - Dans le mur de l’œil, les vents en mer sont estimés à 100 kt soit 185 km/h (sur 1 min) avec des rafales à 230 km/h
Source : Image NOAA 10, provenant de Météo-France Réunion
Edwina le 27 janvier 1993 à 16:05 UTC - L'oeil a un diamètre très impressionnant et rarement observé dans le Sud-Ouest de l'océan Indien 150 km ! Il s'agit d'un cyclone dit annulaire
Source : Image Noaa 12, provenant de NOAA - NCDC
Edwina le 27 janvier 1993 à 16:05 UTC
Source :
Edwina le 27 janvier 1993 à 23:45 UTC - L'oeil a un diamètre très impressionnant et rarement observé dans le Sud-Ouest de l'océan Indien 160 km ! Il s'agit d'un cyclone dit annulaire
Source : Image Noaa 11, provenant de NOAA - NCDC
Edwina - Le 28 janvier 1993 à 01:46 UTC - Dans le mur de l’œil, les vents en mer sont estimés à 95 kt soit 176 km/h (sur 1 min) avec des rafales à 218 km/h
Source : Image NOAA 10, provenant de Météo-France Réunion
Edwina le 28 janvier 1993 à 15:42 UTC - Il s'agit toujours d'un cyclone tropical alors que la latitude 27,5°S est franchie (au Sud du tropique du Capricorne). Dans le mur de l’œil, les vents en mer sont estimés à 90 kt soit 167 km/h (sur 1 min) avec des rafales à 207 km/h
Source : Image Noaa 11, provenant de NOAA - NCDC

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