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Tuesday, 29 December 2020, 16:30 UTC

Cyclone track and SST, 29.12., 06 UTC
Data Source: CIMSS
Satellite image, 29.12., 06 UTC
Data Source: CIMSS
Total precipitation amount, 30.12., 18 Z
Data Source: Wetterzentrale
Wind shear and steering flow, 29.12., 09 UTC
Data Source: CIMSS

Tropical Cyclone
South Indian Ocean

Issued: Tuesday, 29 December 2020, 16:30 UTC

Tropical storm Chalene will reach the coast of central Mozambique at Tueday evening. Wind speeds up to 120 km/h and 24 hours precipitation amounts over 150 mm are expected! This will cause intense floodings and landslides in the highly vulnerable area!


A tropical storm with the name Chalene was formed in the last 18 hours in the South Indian Ocean between Madagascar and south east Africa. After Chalene passed the landmass of Madagascar they developed from a tropical disturbance to a tropical storm. The high sea surface temperature above 29C was the main factor for the intensification period. The storm will move towards south east Africa and will make landfall in Mosambique near Beira at the late evening with only small intensity changes. An inhibiting factor for a stronger intensity is the moderate vertical wind shear in combination with relative dry conditions in the midlevel, which weaken the strong updrafts in the convective bands of the cyclone. Nevertheless they will affect the highly vulnerable central parts of Mosambique with wind speeds up to 120 km/h and strong precipitation. Precipitation amounts above 150 mm in 24 hours will lead to severe floodings and landslides especially in the mountain region to the west!

Issued: December 29, 2020, 16:30 UTC

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