ASMA  Tempête tropicale modérée, saison 2008/2009

Le système ASMA a été baptisé le 19.10.2008 à 18 UTC, il a atteint le stade de Tempête tropicale modérée.
Le vent soutenu en mer a atteint 93 km/h avec des rafales à 115 km/h.
Trois îles ont été touchées par ce système.


Asma - Le 19 octobre 2008 à 09:48 UTC - Asma qui est en cours d'intensification. Source : Image provenant de Jean-Paul HOARAU - jpghoarau@runnet.com

Les différents stades atteints par ASMA

Passez le pointeur de la souris sur le tableau pour afficher des détails le cas échéant.
: L'intensité augmente : L'intensité diminue
Stades atteints
Date de l'évolution
Zone perturbée
15.10.2008 à 18 UTC
L'intensité augmente
Perturbation tropicale
16.10.2008 à 06 UTC
L'intensité augmente
Dépression tropicale
19.10.2008 à 12 UTC
L'intensité augmente
Tempête tropicale modérée
19.10.2008 à 18 UTC
L'intensité augmente
Dépression tropicale
21.10.2008 à 00 UTC
L'intensité diminue
Perturbation tropicale
21.10.2008 à 12 UTC
L'intensité diminue
Zone perturbée
23.10.2008 à 12 UTC
L'intensité diminue

Valeurs maximales

Valeurs maximales atteintes par ASMA, le 20 octobre 2008 à 06 UTC  
Intensité sur l'échelle de Dvorak (nombre Ci) 3,0+/8,0
Intensité sur la classification Australienne 1/5
Pression estimée au centre 988 mb
Vent moyen sur 10 mn (donnée Météo-France) 83 Km/h, 45 Kt
Vent moyen sur 1 mn (donnée Météo-France) 93 Km/h, 50 Kt
Vent moyen sur 1 mn (donnée JTWC) 102 Km/h, 55 Kt
Vent moyen sur 1 mn (intensité atteinte la plus probable) 93 Km/h, 50 Kt
Rafales 115 Km/h, 62 Kt

 

Tableau des impacts sur les îles

Îles
Distance et intensité correspondante
Date
Alerte
Détails
Agalega 70 km au Sud, au stade de perturbation tropicale (s'affaiblissant) 21.10.2008 à 21 UTC Aucune Pas de détail
Les Glorieuses 10 km au Sud, au stade de dépression se comblant 23.10.2008 à 21 UTC Aucune Pas de détail
Les Comores et Mayotte Sur l'île de la Grande Comore, au stade de dépression se comblant 24.10.2008 à 15 UTC Vigilance cyclonique pour les Comores Pas de détail
 

Conclusion

La saison 2008/2009 commence donc en octobre. Asma baptisé le 19 octobre restera un système de faible intensité. Cette saison commençant légèrement plus tôt que la normale, sera-t-elle plus riche en systèmes baptisés que les saisons précédentes ? Rendez-vous vers le mois d'avril 2009...



On October 16, 2008, RSMC La Réunion designated an area of low pressure north-west of Diego Garcia as Tropical Disturbance 02.. Later that evening the Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert on the system. Later that evening the JTWC issued their first advisory and designated it as Tropical Cyclone 01S. Early the next day the disturbance intensified into a tropical depression.. Early on October 18, RSMC La Réunion downgraded the system to a tropical disturbance noting that the near gale-force winds that were near the center are now several hundred kilometers away from the center.. The next day RSMC Réunion re-upgraded the system to a tropical depression due to a slight decrease in vertical wind shear that had inhibited the disturbance and a slight re-location of the center. Later that day RSMC La Réunion upgraded the depression to a Moderate Tropical storm, so the Sub-Regional Tropical Cyclone Advisory Centre in Maurtius assigned the name Asma to the tropical storm. Early on October 20, Asma reached its peak intensity with winds of 85 km/h (50 mph) with a minimum pressure of 985 hPa (mbar). The storm featured good outflow and was situated over warm waters; however, moderate wind shear was forecast to prevent the cyclone from intensifying any further. Shortly after reaching peak intensity, the combination of cooler waters and higher wind shear caused the storm to weaken slightly. Continued weakening took place throughout the day as deep convection associated with Asma dissipated and the strongest winds were displaced from the center. By the morning of October 21, Asma was downgraded to a tropical depression as the low became further disorganized. Later that day, the depression degenerated to a tropical disturbance as only an exposed low remained. The final advisory was issued at 0600 UTC on October 22 as no redevelopment took place. However, only 12 hours after the final advisory was issued, the disturbance began to regenerate and La Réunion began issuing advisories on the regenerated system. The redevelopment was short lived and Asma dissipated less than 24 hours later.

Officials in Madagascar issued storm warnings as Tropical Storm Asma was forecast to make landfall in the northern portion of the island on October 23. Despite warnings, residents did not take precautions before the storm. Following the regeneration of Asma, the storm produced heavy rains over northern Madagascar which caused flooding in eight rural communities. One person was killed in Doany common rural district of Andapa. A total of 448 hectares of farmland were also inundated by floodwaters. Six oxen and 24 pigs were also killed and three bridges were damaged. Following the damages caused by the storm, officials provided first aid kits, nine tons of rice, 100 cartons of soap, 60 cartons of clothing, 120 mosquito nets, 20 bags of pulses and 30 tents to the affected population. The heavy rains were accompanied by winds gusting up to 70 km/h (43 mph). After brushing Madagascar, Asma brought unseasonable heavy rains to parts of Mozambique and Tanzania.

Votre experience avec ASMA

Vous avez vécu ASMA, racontez-nous comment vous l'avez vécu, témoignage, anecdotes...

Ajouter un message