After passing over Hainan, it intensified into a severe tropical storm and made landfall over the Red River Delta in Northern Vietnam late on July 27, and dissipated the next day.

[2][3] Mirinae was first noted as a tropical depression during July 25, as it moved off the west coast of Luzon into the South China Sea, about 300 km (185 mi) to the east of the Paracel Islands.

[5][6] Later that day the JTWC initiated advisories on the system and classified it as Tropical Depression 05W, as it moved north-westwards along the periphery of a subtropical ridge of high pressure.

[4][7] Mirinae subsequently weakened slightly as it made landfall later that day, near Wanning and crossed Hainan Island, before it re-intensified as it had moved into the Gulf of Tonkin.

[4][12] Tropical Storm Mirinae made landfall in Dongao Town, Wanning City at 22:20 p.m. on July 26,[8] packing winds of up to 100 km/h (62 mph) in Hainan.

[21] Mirinae's heavy rains brought in Northern and North–Central Vietnam, with rainfall from the storm exceeded 287 mm (11.3 in) in Tam Đảo District, Vĩnh Phúc Province.