Kamisy reached winds of 170 km/h (105 mph) before making landfall in extreme northern Madagascar near Diego Suarez.

After emerging into the Indian Ocean off the east coast of Madagascar, the system reintensified into a moderate tropical storm before dissipating on 16 April.

In northern Madagascar, Kamisy produced wind gusts of 250 km/h (155 mph), which destroyed 80% of the city of Diego Suarez.

In western Madagascar, the cyclone dropped 232.2 mm (9.14 in) of rainfall in 24 hours in Majunga, which damaged rice fields in the region after causing widespread river flooding.

In addition to the impact to Madagascar, one death and severe damage was reported in the Comoro Islands, where all of the banana crop was destroyed.

On 3 April, the system was assigned a Dvorak rating of T2.0[1] and was respectively upgraded into a moderate tropical storm by the Météo-France office on Reunion (MFR).

[nb 1] The storm initially tracked west-southwest, but after briefly weakening into a tropical depression, Kamisy began to turn west.

Early on 7 April, however, Kamisy was upgraded into a severe tropical storm[3] as it had earned a rating of T4.0 on the Dvorak scale.

However, the afternoon to storm emerged into the extreme northern Mozambique Channel, where it passed near Mayotte, with little change in strength.

After sharply turning south-southwest, Kamisy briefly regained tropical cyclone intensity, but resumed weakening as it approached the coast.

[15] After making its first landfall, the storm struck Mayotte, in the Comoros island group, where severe damage was recorded.

[24] Two French rescue mission, including one from Reunion, provided victims with food and medical assistance to Madagascar and Mayotte.

[7] Additionally, the head of Minister of State, Foreign and Commonwealth Office intended to focus on the reconstruction of bridges and roads.

[27] A private consulting company was later hired to conduct a post-storm assessment; a training program was subsequently launched, which had a budget of $3.5 million.

[11] Sailors from the US Navy's warship USS Hector, were diverted to assist in the relief effort in Diego-Suarez, between April 23 and May 1, 1984.

[25][28][29] The warship was the first American naval vessel to visit the port after Madagascar's Government banned the superpowers including France and the United States from using it during the 1970s and were awarded two Humanitarian Service Medals.

[25][28][29] Amongst other assistance provided they restored the roof and power to the ports hospital and repaired the leprosarium at Befaria, near Diego-Suarez.