Amber Rainstorm Warning Signal issued at 7.40pm, risk of flooding in Sai Kung District (Updated: 7.45pm)

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4th May 2024 – 9Hong Kong) At 7.40am, the Hong Kong Observatory issued a Special Announcement stating that an Amber Rainstorm Warning Signal has been raised, indicating the occurrence or expected occurrence of heavy rain exceeding 30 millimetres per hour across Hong Kong, leading to potential flooding in low-lying and poorly drained areas, urging individuals at risk to take necessary precautions.

The Sai Kung District has been particularly affected, with rainfall exceeding 70 millimetres per hour, a situation that could potentially lead to serious flooding. The intensity of the downpour was even more pronounced in Tseung Kwan O, where more than 100 millimetres of rain was recorded within just one hour, ending at 5.40am this morning.

In response to the escalating situation, the Hong Kong Observatory has extended a thunderstorm warning until 9am today, indicating the likelihood of a few more thunderstorms occurring across Hong Kong. These storms are part of a larger pattern of showers and thunderstorms driven by an upper-air disturbance near the Pearl River Estuary.

Moreover, the weather is being influenced by a fresh to strong easterly airstream along the coast of Guangdong, which is expected to persist through the day. This condition contributes to the unsettled weather pattern that is forecasted to affect southern China over the weekend, including Hong Kong.

Today’s specific forecast for Hong Kong calls for mainly cloudy skies with frequent showers and some thunderstorms. The showers are expected to be heavy at times, with a peak temperature around 26 degrees Celsius. Winds will range from moderate to fresh, originating from the east to southeast, and may strengthen, particularly offshore.

Looking ahead, the weather outlook for Sunday in Hong Kong includes occasional showers and a few thunderstorms initially. However, conditions are set to improve with hotter temperatures and sunny intervals expected in the following days.

The region’s weather early next week will see an influence from an anticyclone aloft, promising hotter and brighter days, particularly along the coast of Guangdong. By Wednesday, another surge of the easterly airstream is anticipated to affect the southern coast of China, bringing additional showers and windier conditions along the coastal areas.

Source: Hong Kong Observatory