Typhoon Cempaka was a moderately-strong and fairly long-lived tropical cyclone that caused substantial damage in China and Vietnam toward the end of July 2021.

The storm subsequently initiated a counterclockwise loop, moving westward across southern China, and turning southward and emerging into the Gulf of Tonkin on July 23.

At 18:00 UTC on July 16, the Japan Meteorological Agency (JMA)[nb 1] started to monitor a tropical disturbance that formed in the South China Sea, west of the Philippines.

[2] Moving westward and later to the west-northwest, the system further intensified to a tropical depression and was designated as Invest 99W by the Joint Typhoon Warning Center (JTWC)[nb 2] two hours later, with its development chances being "low".

[6] By the next day, the JTWC had upgraded the system to a tropical depression, designating it as 10W, since it had an improved convective structure and had developed a defined low level circulation.

[10] At 21:00 UTC, the JTWC declared Cempaka to be a Category 1 typhoon, as it developed a 15 nmi (28 km; 17 mi) wide ragged eye.

Local authorities ordered the shutdown of 57 coastal tourist destinations, called back 36,280 fishing vessels and asked 16,243 fish-farming workers to be evacuated ashore, according to the provincial emergency management department.

[18] In Yangxi County, the local transportation bureau dispatched 325 staff and law enforcement personnel, inspected 120 vehicles to carry out typhoon rescue, road clearance and traffic diversion, and cleared more than 80 roadblocks.

3 alert, a 60-year old hiker was found dead following hours of long search and was discovered to have been swept away by flooding after reaching Hero Falls, the police said.

[23] The city of Lào Cai experienced torrential rains, submerging many roads, streets and caused hundreds of households to be flooded.