Cyclone Idai was bringing more floodwater and destruction to areas of Mozambique and Malawi where scores of people have already been killed and tens of thousands displaced by floods over the past few weeks.
The Southern African country is prone to cyclones.
Mozambique cabinet spokesperson Ana Comoana said the "government has decreed a red alert due to the continuing rains and the approach of the tropical cyclone Idai, expected to reach the country between Thursday to Friday". More than a million people have already been directly affected by the disaster.
AccuWeather South Africa reported that the most dire situation for Beira would unfold if Idai makes landfall just to the north of the city, resulting in the highest amount of water piling up around the mouth of the Pungwe River.
Flooding in Malawi and Mozambique had affected almost 843,000 people and caused at least 60 deaths as of 11 March, according to preliminary reports from the respective Governments.
Cyclone Idai makes landfall in Mozambique.
In neighbouring Malawi, floods have left over 230 000 people without shelter and affected around 739 000 people, according to the UN.
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Matabeleland is a region which covers a considerable part of the south western plateau of Zimbabwe.
Government emergency services had yet to give an update but the South African Weather Service (SAWS) said the cyclone was moving inland, northwest of Beira.
According to the Mozambican Master Plan for Disaster Risk Reduction 2017-2030, the Mozambique National Institute for Disaster Management argues that over the last 20 years, the country has experienced increasing high intensity and frequency of extreme weather events.
News24 reported that Tropical Storm Dineo with winds in excess of 166km/h hit Mozambique in February 2018.
Idai slammed onshore with destructive winds and flooding rain in the vicinity of Beira.
"A team of 15 rescuers, including rescue technicians, advanced life support paramedics, and lifeguards, are on their way with six 4×4 vehicles, boats, and jet skis to assist the community".