Cyclone Bondo

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Map key
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

An area of convection, or thunderstorms, persisted west of Diego Garcia in the central Indian Ocean on 15 December. That day, the Météo-France meteorological office in Réunion (MFR) [nb 1] classified the weather disturbance as Tropical Disturbance 3. Over the next two days, the disturbance became more organized, with increasing convection over the center. This was due to the system moving into an area of lower wind shear. On 18 December, the MFR upgraded the system to Moderate Tropical Storm Bondo. On the same day, the Joint Typhoon Warning Center (JTWC) [nb 2] began issuing advisories on Bondo, designating it Tropical Cyclone 05S. [2] [3] [4]

Steered by a ridge to the south, Bondo moved westward into an area conducive for strengthening, including low wind shear, warm waters of around 29 °C (84 °F), and favorable outflow. Within 18 hours of being named, Bondo intensified to tropical cyclone status, or the equivalent of a minimal hurricane, and continued to rapidly intensify. Late on 19 December, the JTWC estimated peak 1-minute winds of 250 km/h (155 mph). Early on 20 December, the MFR estimated peak 10-minute winds of 205 km/h (125 mph), making Bondo an intense tropical cyclone. At 02:30 UTC that day, Bondo passed about 20 km (12 mi) south of Agaléga, one of the Outer Islands of Mauritius. Despite the close approach at peak intensity, the cyclone's small size spared the strongest winds from affecting the island. [2] [3] [5]

Increasing wind shear and an eyewall replacement cycle caused Bondo to weaken, beginning on 20 December. On the same day, the track shifted to the west-northwest. [3] [5] On 21 December, Bondo passed over Providence Atoll and Farquhar Atoll, part of the Outer Islands of Seychelles. It was the most intense tropical cyclone in several decades to strike that part of the Seychelles. [6] On 22 December, Bondo weakened to a moderate tropical storm as its track shifted to the southwest. The storm re-intensified due to warmer waters, regaining tropical cyclone intensity late on 23 December near the northern tip of Madagascar. On the next day, the JTWC estimated a secondary peak intensity of 215 km/h (135 mph), while the MFR estimated a secondary peak of 140 km/h (85 mph). Land interaction and drier air caused the storm to weaken slightly. Around 12:00 UTC on 25 December, Bondo made landfall in northwestern Madagascar near Mahajanga as a severe tropical storm. The storm weakened to a tropical disturbance while continuing southward through the country. On 26 December, Bondo emerged into the Mozambique Channel. The MFR continued tracking the disturbance for two more days, by which point Bondo was located off the southwest coast of Madagascar. [2] [3] [5]

Preparations and impact

Cyclone Bondo nearing landfall in Madagascar on 25 December Cyclone Bondo 25 dec 2006 0655Z.jpg
Cyclone Bondo nearing landfall in Madagascar on 25 December

Cyclone Bondo first affected the small island of Agaléga. The Mauritius Meteorological Service warned for the potential of storm surge, high winds, and heavy rainfall. While passing nearby, wind gusts did not exceed 100 km/h (62 mph). However, rainfall from the storm occurred on Agaléga, reaching about 287 mm (11.3 in) over 24 hours. [5]

Due to its proximity to the equator, the Farquhar Atoll is rarely affected by tropical cyclones. [5] Bondo was the first cyclone to affect Farquhar since Tropical Storm Honorine in 1974. [7] The MFR described Bondo as "shaking the immemorial peacefulness of the islets of the Farquhar Archipelago and wreaking havoc on the northernmost ones." [8] On 21 December, officials in Seychelles evacuated 35 of its 43 residents. The remaining eight stayed on Providence Atoll in a concrete bunker, unable to be evacuated due to limited time and resources. [9] [6] Bondo destroyed most of the buildings and about 60% of the coconut trees on Providence, decimating the island's copra industry. The island's human population was evacuated following the storm and not returned, due to the inability for emergency evacuations. [10] The storm killed native pigs, birds, hens, and cats on Providence, while also wrecking vegetation. [11] The cyclone also produced 1.8 m (5.9 ft) tides higher than normal in the Inner Islands of Seychelles, along with 3 m (9.8 ft) waves. Rough seas caused flooding, beach erosion, and coastal damage on Mahé, Praslin, and La Digue. One person was injured on Mahé. [6]

In northern Madagascar, Cyclone Bondo produced gusty winds and heavy rainfall. Eleven people were killed as a result of Bondo and another was reported as missing. A total of 20,001 people were left homeless. [12] One of the fatalities took place in Mahajanga after a wall collapsed on a man. Another fatality occurred offshore after a man went missing while taking his family canoeing. Roughly 300 people were affected in the city of Mahajanga alone. [13] The city recorded 179 mm (7.0 in) of rainfall in 24 hours, as well as peak wind gusts of 155 km/h (96 mph). [8] Bondo knocked out the power, water, and phone service in Mahajanga, [14] hampering rescue efforts. [15]

Aftermath

In the Seychelles, officials reinforced buildings to withstand future storm damage, following Cyclone Bondo. The improvements failed to withstand the winds from a stronger storm, Cyclone Fantala, which affected the same group of islands in 2016. [16]

In conjunction with the International Red Cross, rescue teams in Madagascar were deployed to the hardest hit regions on 27 December. These teams traveled by road to the region while a third team was set to arrive by helicopter several days later. [15] Bondo was the first in a series of six storms to affect Madagascar in the 2006-07 season, followed by Severe Tropical Storm Clovis, which struck southeastern Madagascar in January; Cyclones Favio and Gamede, which brushed the island in February, Indlala in March, and Jaya in April. [17] In late-February, 2007, the Government of Norway provided $800,000 in relief funds for the combined effects of Cyclones Bondo, Favio and Clovis. [18] On 15 March, the United Nations announced a funding program after three other storms had struck Madagascar. The goal was to provide roughly $9 million to about 300,000 of the millions of affected population. However, upon the announcement, only $3 million of this fund had been allocated. [19] Following the widespread damage from Cyclone Indlala in March, 2007, the Government of Madagascar launched an appeal to the United Nations for $246 million in relief funds for damage wrought by all five cyclones. [20] The appeal ultimately raised 76% of its target, which was spent on food, shelter, and other emergency items. [21]

See also

Notes

  1. Météo-France's meteorological office in Réunion (MFR) is the official Regional Specialized Meteorological Center for the South-West Indian Ocean, tracking all tropical cyclones from the east coast of Africa to 90° E. [1]
  2. The Joint Typhoon Warning Center (JTWC) is a joint United States NavyUnited States Air Force task force that issues advisories for storms in the basin.

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<span class="mw-page-title-main">Cyclone Hary</span> South-West Indian cyclone in 2002

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<span class="mw-page-title-main">Cyclone Alibera</span> South-West Indian tropical cyclone in 1989

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<span class="mw-page-title-main">2015–16 South-West Indian Ocean cyclone season</span> Cyclone season in the Southwest Indian Ocean

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<span class="mw-page-title-main">Cyclone Fantala</span> South-West Indian Ocean cyclone in 2016

Very Intense Tropical Cyclone Fantala was the most intense tropical cyclone recorded in the South-West Indian Ocean in terms of sustained winds. Part of the 2015–16 cyclone season, Fantala formed on 11 April to the south of Diego Garcia, an island in the central Indian Ocean. With a ridge to the south, the storm moved westward for several days while gaining strength, aided by warm waters and decreasing wind shear. Late on 17 April, the Météo-France office on Réunion (MFR) estimated peak 10-minute winds of 250 km/h (155 mph), making Fantala the strongest tropical cyclone of the basin in terms of 10-minute sustained winds. The Joint Typhoon Warning Center (JTWC) estimated peak 1-minute winds of 285 km/h (180 mph), equivalent to Category 5 intensity on the Saffir-Simpson scale, also the strongest on record in the South-West Indian Ocean, in terms of maximum sustained wind speed. Early on 18 April, Fantala reached its peak intensity, with a minimum central pressure of 910 millibars (27 inHg).

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Intense Tropical Cyclone Bondo
Cyclone Bondo 20 dec 2006 0635Z.jpg
Intense Tropical Cyclone Bondo on 20 December
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