 Severe Tropical Storm Domoina in 1984 caused 100 year floods in South Africa and record rainfall in Swaziland . The fourth named storm of the season , Domoina developed on January 16 off the northeast coast of Madagascar . With a ridge to the north , the storm tracked generally westward and later southwestward . On January 21 , Domoina struck eastern Madagascar , the third storm in six weeks to affect the nation ; collectively , the storms caused 42 deaths and $ 25 million in damage ( 1984 USD ) . After crossing the country , Domoina strengthened in the Mozambique Channel to peak 10 minute sustained winds of 95 km / h ( 60 mph ) . On January 28 , the storm made landfall in southern Mozambique , and slowly weakened over land . Domoina crossed into Swaziland and later eastern South Africa before dissipating on February 2 . 
