Hong Kong issued its highest storm warning on Sunday (July 20) as Typhoon Wipha, packing winds of more than 103 miles (167 kilometres) per hour, brought heavy rain and wind across the territory, forcing the cancellation of more than 200 flights.

A tropical storm is intensifying and is expected to reach typhoon strength before hitting southern China's coast on Sunday.

Severe Tropical Storm Wipha (formerly Crising) maintained its strength Saturday as it moved away from the Philippine landmass, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa).

The Hong Kong Observatory on Friday issued the Amber Rainstorm warning signal at 11.15am as tropical cyclone Wipha edges closer to Hong Kong.

Extremely hot weather is expected to persist due to the outer subsiding air of the tropical cyclone. The Labour Department has reminded employers and employees to take appropriate measures to prevent heat stroke.

Tropical storm Wipha is on course to enter within 800 kilometres of Macau tomorrow, with the signal no.1 alert to be issued.

The Hong Kong Observatory issued the Standby Signal No 1 at 2:20 am on Saturday, after Tropical Cyclone Wipha moved to within 800 kilometres of Hong