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Name Duration Peak intensity Areas affected Damage (Deaths Refs Wind speed Pressure Felicity: 13 – 20 December 1989: 140 km/h (85 mph) 970 hPa (28.64 inHg)
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.
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.
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]
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.
The National Weather Service advised that people "should delay all travel if possible. If travel is absolutely necessary, drive with extreme caution and be prepared for sudden changes in visibility.
The 2024–25 South-West Indian Ocean cyclone season is the current annual cycle of tropical cyclone and subtropical cyclone formation in the South-West Indian Ocean. It began on 15 November 2024, and will end on 30 April 2025, with the exception for Mauritius and the Seychelles, for which it will end on 15 May 2025.
"Many areas across the northern tier will start the month of December with temperatures well below historical averages," AccuWeather Lead Long-Range Expert Paul Pastelok said Dec. 1 marks the beginn