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December 4. 2100 UTC — Zone of disturbed weather 06 moves into the South-West Indian Ocean. [16] December 6. 0000 UTC — RSMC La Réunion reports that Zone of Disturbed Weather 06 has intensified into a tropical disturbance. [16] December 7. 0000 UTC — The JTWC designates Tropical Disturbance 06 as Tropical Storm 03S. [17]
On December 16, a complex of disturbed weather near Indonesia was designated as a tropical low by the Australian Bureau of Meteorology. [33] In an area of only moderate inhibiting atmospheric conditions, the low was able to steadily intensify, reaching tropical cyclone status on December 18 as it tracked southwestward. [ 34 ]
The 2019–20 South-West Indian Ocean cyclone season was a slightly above-average season in tropical cyclone and subtropical cyclone formation west of 90°E.The season officially began on 15 November, however, the formation of the first system—Zone of Disturbed Weather 01—occurred on 22 July 2019, well before the official start of the season.
Severe Tropical Storm Chalane was the first of three consecutive tropical cyclones that struck Mozambique in the 2020-21 South-West Indian Ocean cyclone season.As the fourth tropical depression, third named storm, and second severe tropical storm of the season, Chalane developed out of a zone of disturbed weather which was first monitored RSMC La Réunion on 19 December.
Tropical Cyclone Belna was a strong tropical cyclone that made landfall over northwestern Madagascar in December 2019, becoming the first to do so since Hellen in 2014.Belna's precursor—an initially broad trough of low pressure west of Seychelles—was formally designated as a zone of disturbed weather on 2 December during a favourable period for tropical cyclogenesis in the Indian Ocean.
The same Zone of Disturbed Weather which exited on 20 December, again re-entered on 28 December, following with another Zone of Disturbed Weather, designated 06. On 1 January, 06 intensified into Tropical Storm Danilo. It became the second longest system and dissipated on 12 January.
On December 14, the system moved far enough from Madagascar that it re-intensified into a moderate tropical storm near Juan de Nova Island; this island recorded wind gusts of 112 km/h (70 mph) and 289 mm (11.4 in) of rainfall during the passage. As Cela moved southward, its convective structure organized further, developing an eye in the center.
Soon after, the MFR recognized the circulation as a zone of disturbed weather. [124] Soon afterwards, the MMS received the name Ialy after the agency upgraded the system into a tropical storm. The JTWC then also recognised the system as a cyclone, issuing warnings on it as Tropical Cyclone 24S. [125]