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).

On 19 December, RSMC La Réunion began monitoring a zone of disturbed weather situated approximately 830 km (520 mi) southwest of Diego Garcia.

[10] Convective activity remained disorganized while the center accelerated west up to landfall on 26 December at 18:00 UTC in Mahavelona, Madagascar.

[18] Chalane degenerated into a remnant low later that day over Zimbabwe, as all thunderstorm activity had ceased, and the MRF issued their final advisory on the storm.

[19] However, Chalane's remnants continued westward over the next several days,[20] emerging into the South Atlantic on 3 January, before dissipating shortly afterward.

Meanwhile, the Department of Climate Change and Meteorological services warned that Chalane could bring strong winds, heavy rainfall, and flooding in Malawi.

[25] As if the region was not already critically devastated by Cyclone Idai in 2019 with thousands displaced from their homes, Chalane made landfall early in the morning on 30 December, with maximum sustained winds of 45 knots (83 km/h; 52 mph).

[27] According to preliminary reports by the National Institute for Disaster Management (INGC), In Sofala Province, at least 10,930 people (2,186 families) have been affected by Chalane.

In Manica Province, 345 people (69 families) were affected, and 68 houses and makeshifts shelters and 13 classrooms were destroyed, while 11 health units were damaged.

Chalane made landfall in the Fenoarivo Atsinanana District late 26 December, with maximum wind gusts of between 40 and 50 km/h (25 and 31 mph).

[33] When tropical storm warnings where put in place, school reopenings were further delayed by both the inhibiting weather produced by Chalane, and a spike in COVID-19 cases.

[35] When Chalane finally made impact in the evening of 30 December as a tropical depression, heavy rains and bursts of strong winds were felt in Chimanimani East in Manicaland Province, with some roofs of houses blown off, as well electricity and cellular network disruptions.

[36] The remnants of Chalane and a low pressure system caused heavy rain and thunderstorms across the entirety of the country on 2 January.