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Danny Mok

This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing.
Hongkongers can expect unstable weather early next week with heavy showers and thunderstorms possible because of the emergence of a southwest monsoon.
The Observatory said on Thursday that showers would be heavy at times with squally thunderstorms early next week, under the influence of a broad low-pressure trough.
Showers are expected to persist into the middle to latter parts of next week, under the influence of a southerly airstream.
The forecaster said a dry easterly airstream was bringing generally fine weather to the coast of Guangdong province on Thursday.
Sunny periods are expected on Friday and Saturday, but more showers are forecast in the following few days. Temperatures will range between 24 and 29 degrees Celsius (84 degrees Fahrenheit).
The southwest monsoon in the South China Sea typically arrives around May 16 to 25. From a climatological perspective, the monsoon is an important part of seasonal variations. It marked the start of the rainy season, the Observatory said.
The basic driving force of the southwest monsoon is large-scale differential heating between land mass and the ocean.
Starting from April, as the Asian continent heats up faster than its neighbouring oceans, a low pressure centre forms.

Computer models predict that during the weekend, southwest winds in the lower levels of the South China Sea will gradually establish themselves.
The northern part of the South China Sea will also be gradually influenced by southerly wind, providing favourable thermal and moisture conditions for convection development along South China coastal areas and the northern part of the South China Sea.
The Observatory said that if other atmospheric conditions were suitable, there would be a chance of triggering heavy rainfall.


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Hong Kong weather

Hong Kong set for more unstable weather with heavy showers, thunderstorms forecast due to southwest monsoon

Hong Kong can expect some unsettled weather early next week. Photo: Sam Tsang

 A dry easterly airstream is bringing generally fine weather to the city. Photo: May Tse

Hong Kong hit by heavy rain and thunderstorms, with eastern areas bearing brunt of deluge

Residents have been told to brace for the change in weather. Photo: Sam Tsang

Why was Hong Kong pelted with torrential rain on Saturday and is global warming to blame?

Flooding along Tai Mong Tsai Road near Tai Wan Tsuen in Sai Kung. Photo: Handout

Staff of an AEON department store in Tseung Kwan O clean up from the heavy rain on Saturday. Photo: Yik Yeung-man

The red rainstorm warning was in effect from 8.55am to 3.50pm before being lowered to an amber signal. Photo: Xiaomei Chen

Scaffolding used for the bun tower scrambling festival collapsed at around 5pm in Cheung Chau. Facebook / @ Footprint of Cheung Chau

Residents don wet weather gear in Hung Hom. April was also wetter than normal, with the total rainfall exceeding the average value by 68 per cent. Photo: Jonathan Wong

Flooding in Qingyuan in Guangdong province. Photo: AFP

Weather

Hong Kong

Observatory says showers will be heavy at times with squally thunderstorms early next week
Southwest monsoon marks the start of rainy season, Observatory says


Observatory says showers will be heavy at times with squally thunderstorms early next week.


Hong Kong environmental issues

Extreme weather

Environment

Climate change

Hong Kong set for more unstable weather with heavy showers, thunderstorms forecast due to southwest monsoon

Observatory says showers will be heavy at times with squally thunderstorms early next week Southwest monsoon marks the start of rainy season, Observatory says

Observatory says showers will be heavy at times with squally thunderstorms early next week

Southwest monsoon marks the start of rainy season, Observatory says