1999-00 South-West Indian Ocean cyclone season
Encyclopedia
The 1999-00 South-West Indian Ocean tropical cyclone season was an event in the annual cycle of tropical cyclone
Tropical cyclone
A tropical cyclone is a storm system characterized by a large low-pressure center and numerous thunderstorms that produce strong winds and heavy rain. Tropical cyclones strengthen when water evaporated from the ocean is released as the saturated air rises, resulting in condensation of water vapor...

 formation and ran from November 1, 1999 to April 30, 2000 in the South-West Indian Ocean, with the exception of Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...

 and the Seychelles
Seychelles
Seychelles , officially the Republic of Seychelles , is an island country spanning an archipelago of 115 islands in the Indian Ocean, some east of mainland Africa, northeast of the island of Madagascar....

, for which it ran until May 15.

Cyclone Leon-Eline
Cyclone Leon-Eline
Cyclone Leon–Eline was a long-lived Indian Ocean tropical cyclone which traversed almost the entire Indian ocean and made devastating strikes on Madagascar, Mozambique and South Africa, and had less serious effects in Zimbabwe where it eventually died out....

 was one of the most notable storms of the season, existing for 22 days while transversing the whole southern Indian Ocean, and causing severe flooding in South Africa
South Africa
The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

, Mozambique
Mozambique
Mozambique, officially the Republic of Mozambique , is a country in southeastern Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west and Swaziland and South Africa to the southwest...

 and Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

.

Severe Tropical Storm Astride

On December 24, 1999, a low formed about 240 nmi (444.5 km) southeast of Diego Garcia
Diego Garcia
Diego Garcia is a tropical, footprint-shaped coral atoll located south of the equator in the central Indian Ocean at 7 degrees, 26 minutes south latitude. It is part of the British Indian Ocean Territory [BIOT] and is positioned at 72°23' east longitude....

 and moved westward. The disturbance was upgraded to tropical depression status on December 25, 1800 hours (UTC), and upgraded to moderate tropical storm intensity on December 26 and named Astride. It moved to the west south-west and reached severe tropical storm intensity on December 27 0000 (UTC) with 10-min MSW near 50 knots (98 km/h), located 190 nmi (351.9 km) north-east of St. Brandon. Astride slowed its forward motion while intensifying (JTWC estimated 1-min winds of 65 kt). Astride began to slowly weaken from early December 28. On December 30 Astride intensified and was upgraded again to severe tropical storm intensity while moving to the west north-west, but downgraded again to moderate storm intensity at 1800 (UTC) on the same day. Astride made landfall between 1800 (UTC) on December 31 and 0000 (UTC) on January 1, 2000 30 nmi (55.6 km) northeast of Vohemar, Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

. It moved into the Mozambique Channel
Mozambique Channel
The Mozambique Channel is a portion of the Indian Ocean located between the island nation of Madagascar and southeast Africa, primarily the country of Mozambique. It was a World War II clashpoint during the Battle of Madagascar...

 and intensified briefly, but weakened again, and made another landfall near Mogincual, Mozambique
Mozambique
Mozambique, officially the Republic of Mozambique , is a country in southeastern Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west and Swaziland and South Africa to the southwest...

 at 0000 (UTC) on January 3.

Tropical Cyclone Babiola

An area of convection formed 130 nmi (240.8 km) south south-east of Diego Garcia
Diego Garcia
Diego Garcia is a tropical, footprint-shaped coral atoll located south of the equator in the central Indian Ocean at 7 degrees, 26 minutes south latitude. It is part of the British Indian Ocean Territory [BIOT] and is positioned at 72°23' east longitude....

. It moved eastward, then moved southwest and strengthened. MFR upgraded to a depression on the 6th at 0000 (UTC) and upgraded to Moderate Tropical Storm Babiola at 0600 (UTC) on the same day. It continued to move south-west, then accelerated more to the west southwest while reaching cyclone strength on January 7 at 1200 (UTC), centred 575 nmi (1,064.9 km) south of Diego Garcia. Babiola reached peak intensity late on January 9 and a ragged eye appeared 20 nmi (37 km) in diameter. JTWC estimated 1-min winds of 90 knots (176.4 km/h), and MFR estimated 10-min winds of 80 knots (156.8 km/h) and a minimum central pressure of 954 mbar. Babiola moved southward on the 10th and began to weaken and became elongated. It continued to weaken on the 11th while moving to the south south-east and becoming extra-tropical. JTWC issued its last warning on January 12 at 0600 (UTC). No damage was reported.

Intense Tropical Cyclone Connie

An area of convection appeared on January 24. It quickly strengthened to tropical storm status on the 25th at 1800 (UTC) and was named Connie. The storm moved northward a bit, but remained quasi-stationary about 380 nmi (703.8 km) north north-west of Mauritius. MFR upgraded Connie to cyclone status with 80 knots (156.8 km/h) winds. Connie strengthened rapidly and on January 27, a well-defined eye 15 nmi (27.8 km) wide was located 235 nmi (435.2 km) northwest of Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...

. JTWC estimated 1-min winds of 115 knots (225.4 km/h), and MFR estimated 10-min winds of 100 knots (196 km/h) and a minimum central pressure of 928 mbar on January 28. Connie moved to the south west which carried it 100 nmi (185.2 km) west of Réunion
Réunion
Réunion is a French island with a population of about 800,000 located in the Indian Ocean, east of Madagascar, about south west of Mauritius, the nearest island.Administratively, Réunion is one of the overseas departments of France...

 and began weakening. Connie recurved to the south south-east on the 30th. On the 31st Connie held on its intensity of 55 knots (107.8 km/h), then rapidly weakened on February 1 and was taking on extratropical characteristics while moving south-eastward.

Connie affected the islands of Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...

 and Réunion, dumping rainfall up to 200 mm. In Mauritius, this provided some relief for the drought-stricken island, but was still not enough. Connie was responsible for two deaths in Reunion. One hundred homes were destroyed with at least 600 people homeless.

Moderate Tropical Storm Damienne

On January 31, 2000 a low formed in the central south Indian Ocean about 300 nmi (555.6 km) south-east of Diego Garcia
Diego Garcia
Diego Garcia is a tropical, footprint-shaped coral atoll located south of the equator in the central Indian Ocean at 7 degrees, 26 minutes south latitude. It is part of the British Indian Ocean Territory [BIOT] and is positioned at 72°23' east longitude....

. On February 1 the storm reached tropical storm strength and was named Damienne. It moved southward with 1-min winds estimated at 45 knots (88.2 km/h) by JTWC, and 10-min winds of 40 knots (78.4 km/h) estimated by MFR. Although forecast to strengthen, the storm did not last long and it quickly dissipated on February 2 while moving south-westward.

Intense Tropical Cyclone Leon-Eline

Cyclone Leon, which had developed in Perth's warning area, crossed 90°E
90th meridian east
The meridian 90° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole.The Ninety East Ridge is named after the meridian....

 on February 8 and was renamed Eline by the sub-regional tropical cyclone advisory centre in Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...

. Leon-Eline moved through the southern Indian Ocean towards Africa and drenched South Africa
South Africa
The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

, Mozambique
Mozambique
Mozambique, officially the Republic of Mozambique , is a country in southeastern Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west and Swaziland and South Africa to the southwest...

 and Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

 with heavy rains and gusty winds, causing severe damage. It dissipated over the African mainland on February 23, after causing over 1,000 fatalaties.

Severe Tropical Storm Felicia

A low formed on February 17 near 13˚S, 81˚E. It was classified a tropical storm br MFR on the 20th at 0000 (UTC) while located 500 nmi (926 km) south southeast of Diego Garcia
Diego Garcia
Diego Garcia is a tropical, footprint-shaped coral atoll located south of the equator in the central Indian Ocean at 7 degrees, 26 minutes south latitude. It is part of the British Indian Ocean Territory [BIOT] and is positioned at 72°23' east longitude....

 and was named Felicia. It moved west southwestward which later became south westward. It was temporarily downgraded to a depression at 1800 (UTC), but upgraded again 12 hours later. On February 23, it reached its peak intensity. JTWC estimated 1-min winds of 50 knots (98 km/h), but MFR estimated 10-min winds of 60 knots (117.6 km/h). Felicia continued to move to the south southwest, but it weakened rapidly thereafter. MFR issued its final warning on February 24 at 0600 (UTC) as it transitioned into an extratropical low, located 665 nm south south-east of Rodrigues Island.

Severe Tropical Storm Gloria

An area of convection east of northern Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

 formed on February 27. MFR started issuing bulletins on February 28 at 0600 (UTC) when the system was located 600 nmi (1,111.2 km) east of northern Madagascar. It was upgraded to a depression on February 29 at 0000 (UTC) while moving westward, and started moving more northerly. The depression was upgraded to Tropical Storm Gloria on March 1 at 0600 (UTC) and turned to the south-west at 9 knots (17.6 km/h). Gloria's centre made landfall near Antsirabe, Madagascar around 1800 (UTC). JTWC's estimated 1-min average sustained winds was 65 knots (127.4 km/h), based on infrared imagery showing a 15 nmi (27.8 km) wide closed eye along the coast. MFR's estimated 10-min average wind speed was somewhat lower at 45 knots (88.2 km/h). On March 2 at 0600 (UTC), MFR issued its last warning. JTWC continued to monitor the system for the next three days as it drifted south-westward over Madagascar. JTWC was consistently forecasting re-intensification over the Mozambique Channel
Mozambique Channel
The Mozambique Channel is a portion of the Indian Ocean located between the island nation of Madagascar and southeast Africa, primarily the country of Mozambique. It was a World War II clashpoint during the Battle of Madagascar...

, but on March 5, the system weakened, and the final warning was written while over the Channel.

Tropical Storm Gloria brought heavy rainfall to northern Madagascar. Mananjary recorded 427 mm in a 48 hour period ending on March 5. The death toll was about 150. Andapa was the most affected city, with 40 people dead and 33 unaccounted for. Over 100 homes were destroyed in the city. The population was affected by an outbreak of cholera. The road linking this region to the capital was blocked, and this was expected to have a significant negative impact on the region's economy.

Tropical Depression 09

This system was classified as Tropical Cyclone 17S by the Joint Typhoon Warning Center.

Tropical Disturbance 11

The remnants of Severe Tropical Cyclone Norman were anticipated to move across 90°E, so Météo-France issued a few bulletins on the system. They assigned it the number 11.

Very Intense Tropical Cyclone Hudah

Cyclone Hudah was an intense and long-lived tropical cyclone that rampaged through the South Indian Ocean from March 24 to April 9, causing massive damage in Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

 and Mozambique
Mozambique
Mozambique, officially the Republic of Mozambique , is a country in southeastern Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west and Swaziland and South Africa to the southwest...

. Striking the area barely a month after Cyclone Leon-Eline roared through the two countries, the combination severely damaged the fragile economies of Mozambique
Mozambique
Mozambique, officially the Republic of Mozambique , is a country in southeastern Africa bordered by the Indian Ocean to the east, Tanzania to the north, Malawi and Zambia to the northwest, Zimbabwe to the west and Swaziland and South Africa to the southwest...

 and Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

.

Moderate Tropical Storm Innocente

An area of disturbance was located on April 9 between Cocos (Keeling) Islands
Cocos (Keeling) Islands
The Territory of the Cocos Islands, also called Cocos Islands and Keeling Islands, is a territory of Australia, located in the Indian Ocean, southwest of Christmas Island and approximately midway between Australia and Sri Lanka....

 and Christmas Island
Christmas Island
The Territory of Christmas Island is a territory of Australia in the Indian Ocean. It is located northwest of the Western Australian city of Perth, south of the Indonesian capital, Jakarta, and ENE of the Cocos Islands....

. It moved west for a few days. MFR began issuing bulletins, as the low crossed the 90 degree East longitude
Longitude
Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. It is an angular measurement, usually expressed in degrees, minutes and seconds, and denoted by the Greek letter lambda ....

 line on April 12 at 1800 (UTC). It still moved westward; on the 14th, it weakened, and the issuing of bulletins were temporarily stopped, however, they were re-instigated on the 15th, as it regenerated. JTWC began issuing warnings at 1800 (UTC) on the same day, while located 640 nmi (1,185.3 km) southeast of Diego Garcia
Diego Garcia
Diego Garcia is a tropical, footprint-shaped coral atoll located south of the equator in the central Indian Ocean at 7 degrees, 26 minutes south latitude. It is part of the British Indian Ocean Territory [BIOT] and is positioned at 72°23' east longitude....

. At 1200 (UTC) on the April 16, MFR upgraded to Tropical Storm Innocente, but was downgraded back to a depression six hours later. On April 17 at 1800 (UTC), MFR upgraded to Tropical Storm Innocente again. It was still moving in a west south-westerly course and began to weaken. At 0000 (UTC) on the April 19, MFR downgraded it to a depression, and wrote their final warning six hours later, while located 400 nm east northeast of Rodrigues Island. The remnant low remained for several days, but failed to show any redevelopment.

Storm names

A tropical disturbance is named when it reaches moderate tropical storm strength. If a tropical disturbance reaches moderate tropical storm status west of 55°E
55th meridian east
The meridian 55° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Europe, Asia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole....

, then the Sub-regional Tropical Cyclone Advisory Centre in Madagascar
Madagascar
The Republic of Madagascar is an island country located in the Indian Ocean off the southeastern coast of Africa...

 assigns the appropriate name to the storm. If a tropical disturbance reaches moderate tropical storm status between 55°E
55th meridian east
The meridian 55° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Europe, Asia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole....

 and 90°E
90th meridian east
The meridian 90° east of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Asia, the Indian Ocean, the Southern Ocean, and Antarctica to the South Pole.The Ninety East Ridge is named after the meridian....

, then the Sub-regional Tropical Cyclone Advisory Centre in Mauritius
Mauritius
Mauritius , officially the Republic of Mauritius is an island nation off the southeast coast of the African continent in the southwest Indian Ocean, about east of Madagascar...

 assigns the appropriate name to the storm. A new annual list is used every year so no names are retired.
  • Astride
  • Babiola
  • Connie
  • Damienne
  • Eline
    Cyclone Leon-Eline
    Cyclone Leon–Eline was a long-lived Indian Ocean tropical cyclone which traversed almost the entire Indian ocean and made devastating strikes on Madagascar, Mozambique and South Africa, and had less serious effects in Zimbabwe where it eventually died out....

  • Felicia
  • Gloria
  • Hudah
  • Innocente

  • See also

    • List of Southern Hemisphere tropical cyclone seasons
    • Atlantic hurricane seasons: 1999
      1999 Atlantic hurricane season
      The 1999 Atlantic hurricane season officially began on June 1, 1999, and lasted until November 30, 1999. These dates conventionally delimit the period of each year when most tropical cyclones form in the Atlantic basin....

      , 2000
      2000 Atlantic hurricane season
      The 2000 Atlantic hurricane season was the first season without a tropical cyclone in July since 1987. The season officially began on June 1, 2000, and lasted until November 30, 2000. The June through November dates conventionally delimit the period of each year when most tropical cyclones form in...

    • Pacific hurricane seasons: 1999
      1999 Pacific hurricane season
      The 1999 Pacific hurricane season officially started on May 15, 1999 in the eastern Pacific, and on June 1, 1999 in the central Pacific, and lasted until November 30, 1999. These dates conventionally delimit the period of each year when most tropical cyclones form in the northeastern Pacific...

      , 2000
      2000 Pacific hurricane season
      The 2000 Pacific hurricane season was an event in tropical cyclone meteorology. There were few notable storms this year. Tropical Storms Miriam, Norman, and Rosa all made landfall in Mexico with minimal impact. Hurricane Daniel briefly threatened the U.S. state of Hawaii while weakening...

    • Pacific typhoon seasons: 1999
      1999 Pacific typhoon season
      The 1999 Pacific typhoon season has no official bounds; it ran year-round in 1999, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November...

      , 2000
      2000 Pacific typhoon season
      The 2000 Pacific typhoon season has no official bounds; it ran year-round in 2000, but most tropical cyclones tend to form in the northwestern Pacific Ocean between May and November...

    • North Indian Ocean cyclone seasons: 1999
      1999 North Indian Ocean cyclone season
      The 1999 North Indian Ocean cyclone season was an event in the annual cycle of tropical cyclone formation. The North Indian Ocean cyclone season has no official bounds, but cyclones tend to form between April and December, with peaks in May and November...

      , 2000
      2000 North Indian Ocean cyclone season
      The 2000 North Indian Ocean cyclone season had no bounds, but cyclones tend to form between April and December, with peaks in May and November. These dates conventionally delimit the period of each year when most tropical cyclones form in the northern Indian Ocean.-Season summary:Six tropical...


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