Tropical Storm Chalane
tropical cyclone in 2020
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. Despite conditions slowly becoming unfavorable, the system formed into a tropical depression on 23 December due to the presence of a Kelvin wave and an equatorial Rossby wave, as well as warm sea surface temperatures. The depression soon strengthened into Tropical Storm Chalane on the following day. Chalane made landfall on Madagascar on 26 December and weakened, before emerging into the Mozambique Channel a couple days later. Subsequently, Chalane restrengthened, before making landfall on Mozambique on 30 December. The system weakened as it moved inland, degenerating into a remnant low later that day. However, Chalane's remnants continued moving westward for another several days, emerging into the South Atlantic on 3 January, before dissipating later that day.
As Chalane strengthened, the coordinating of emergency supplies began in Madagascar, Mozambique, and Zimbabwe, and the Joint Typhoon Warning Center issued a Tropical Cyclone Formation Alert (TCFA). Late December 26, Chalane made landfall in Madagascar, causing flooding.
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