Tropical Cyclone Ava was a powerful and deadly tropical cyclone that severely impacted Madagascar in early January 2018. It was the first tropical cyclone of the 2017–18 South-West Indian Ocean cyclone season to make landfall and caused widespread destruction, heavy rainfall, and significant loss of life across the island.
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Tropical Cyclone Ava (2018)
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|An animation of Cyclone Ava in the Mozambique Channel.
]] Tropical Cyclone Ava was a powerful and deadly tropical cyclone that severely impacted Madagascar in early January 2018. It was the first tropical cyclone of the 2017–18 South-West Indian Ocean cyclone season to make landfall and caused widespread destruction, heavy rainfall, and significant loss of life across the island.
Meteorological History
Tropical Cyclone Ava originated from a persistent area of convection that formed south of the Chagos Archipelago on January 2, 2018. The system gradually organized as it tracked southwestward, fueled by favorable environmental conditions. The Joint Typhoon Warning Center (JTWC) issued a Tropical Cyclone Formation Alert on January 3, and later that day, Météo-France Réunion (MFR), the official regional specialized meteorological center, designated the system as Tropical Depression 04.As the depression continued to move southwest, it intensified rapidly. On January 4, it was upgraded to a Moderate Tropical Storm and named Ava. Conditions remained conducive for strengthening, and Ava soon reached the intensity of a Severe Tropical Storm, then a Tropical Cyclone on January 5, as it approached the eastern coast of Madagascar. Ava attained its peak intensity just prior to landfall, with MFR estimating 10-minute sustained winds of 140 km/h (85 mph) and a minimum central pressure of 960 hPa (28.35 inHg). The JTWC assessed Ava as a Category 2 equivalent on the Saffir-Simpson Hurricane Wind Scale (SSHS), with 1-minute sustained winds of 165 km/h (105 mph).
Ava made landfall near Fenoarivo Atsinanana (Fénérive Est) on Madagascar's east coast on January 5. The cyclone then tracked southward, roughly parallel to the eastern coastline, traversing the mountainous terrain of the island. This interaction with land caused Ava to weaken considerably. By January 6, it had emerged into the Indian Ocean off the southeastern coast as a weakening severe tropical storm. Ava then curved southeastward and subsequently eastward, continuing to weaken over cooler waters and in the presence of increased wind shear. It transitioned into a post-tropical depression on January 7, and its remnants dissipated shortly thereafter.
Impact
Tropical Cyclone Ava brought a devastating combination of strong winds, torrential rainfall, and storm surge to Madagascar, particularly affecting the eastern and central regions, including the capital Antananarivo.- Fatalities and Displacement: At least 51 people were confirmed dead due to Ava's impact, with many more injured. Over 54,000 people were displaced, seeking shelter in temporary evacuation centers.
- Infrastructure Damage: The cyclone caused extensive damage to infrastructure. Numerous roads and bridges were destroyed or rendered impassable by floodwaters and landslides, isolating several communities. Electricity supply was severely disrupted, with tens of thousands of households losing power. Communication networks were also affected.
- Flooding and Landslides: Prolonged and intense rainfall, estimated at over 200 mm (8 inches) in some areas, led to widespread flash flooding and destructive landslides. These events inundated homes, agricultural lands, and urban areas, particularly in low-lying regions and river basins. The capital city, Antananarivo, experienced significant flooding, leading to evacuations and property damage.
- Agricultural Losses: Madagascar's vital agricultural sector suffered substantial losses. Rice paddies, vanilla plantations, and other staple crops were submerged or destroyed, threatening food security in affected areas.
- Economic Impact: The total damage caused by Cyclone Ava was estimated to be in excess of US$100 million (2018 USD), severely impacting the local economy and hindering development efforts.
The nearby French overseas department of Réunion also experienced heavy rainfall and rough seas due to Ava's passage, leading to minor disruptions, but it avoided a direct hit and severe damage.