Cyclone Freddy battered central Mozambique on Sunday after making landfall for a second time in a month.
The cyclone broke records for duration and strength of tropical storms in the southern hemisphere.
More than 171,000 people were affected after the cyclone swept through southern Mozambique last month, killing 27 people in Mozambique and Madagascar.
More than half a million people are at risk of being affected in Mozambique this time, according to the UN Office for the Coordination of Humanitarian Affairs (OCHA).
After passing by the port town of Quelimane, the storm was continuing on inland towards the southern tip of neighboring Malawi, satellite data showed.
Communications and electricity to Quelimane have been cut, making it difficult to assess the extent of the damage.
At least one person was killed there on Saturday when his house collapsed on him as the storm swept onshore, state TV reported.
Two weeks ago, 27 people died when the storm first made landfall, after first being spotted near Indonesia on Feb. 6.
After swirling for 35 days, Freddy is likely to have broken the record for the longest-lasting tropical cyclone, with the previous record held by a 31-day hurricane in 1994, according to the World Meteorological Organisation.
It has also set a record for the highest accumulated cyclone energy, a measure of the storm’s strength over time, of any southern hemisphere storm in history, according to the U.S. National Oceanic & Atmospheric Administration.
Climate change is making hurricanes stronger, scientists say.
Oceans absorb much of the heat from greenhouse gas emissions, and when warm seawater evaporates its heat energy is transferred to the atmosphere, fueling more destructive storms. (NAN)