Entering the late autumn of November, the temperature in Hong Kong will drop slightly under cloudy and rainy weather. The Observatory predicts that the temperature will remain in the teens for three consecutive days starting from next Wednesday (30th), and the temperature in the first two days of December will be between 14 and 18 degrees Celsius Spend.
The scientific director of the Observatory wrote an article today (25th) that the weather next Thursday (December 1) and Friday (December 2) will be quite cool, but how much the minimum temperature can drop depends on the path of the cold air extending southward. Ensemble forecasting systems are still divided on this, with differences hovering between 9 and 17.5 degrees.
However, the southward intrusion of cold air has to "pass three barriers". When it reaches the northern part of Hong Kong, it still has to climb over the nearly 1,000-meter-high Tai Mo Shan before it can invade the urban area in the south. Once the extent of cold air intrusion changes slightly, the local temperature will drop accordingly. different.
Next Tuesday and three half-day drop of 12 degrees
Hong Kong has been cloudy and rainy in recent days, and the temperature has dropped to the low 20s. Today it is between 21 and 23 degrees.
On the footbridge of Wai Yip Street in Kowloon Bay, known as the "Chi Ming Bridge", some people put on thick coats, while others ran shirtless.
The Observatory pointed out that a broad cloud band will cover Guangdong in the next day or two.
The wind along the coast of Guangdong is weak at the beginning of next week, and the daytime is quite warm; however, a cold front is expected to cross South China later next Tuesday (29th) to Wednesday (30th) morning. Affected by the subsequent strong northeast monsoon, the south China coast The weather is noticeably cooler and windy.
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Next Tuesday and Wednesday will be a temperature watershed. The Observatory predicts that the highest temperature in the urban area will be 28 degrees next Tuesday, but the lowest temperature will be only 16 degrees next Wednesday, with a half-day drop of 12 degrees.
The cold front will cross southern China later next Tuesday to Wednesday morning
Ho Le-ping, Lai Sin-ki, and Deng Zhijie, scientific directors of the Observatory, wrote an article today "Cold fronts switch in and attack fiercely, and warm and humid air masses are defeated and leave the field!"
》, pointing out that Hong Kong has been cloudy with showers due to high-altitude disturbances in the past few days, and there will still be a few showers until Saturday and Sunday, while the wind along the coast of Guangdong is weak at the beginning of next week, mainly affected by warm and humid air masses. It is quite warm during the day, with one or two days in the morning and evening and a cold front will cross South China from late next Tuesday to Wednesday morning. The latest computer model forecast shows that the subsequent strong northeast monsoon will "sweep away" the original warm and humid air mass, and the temperature in the area will be significantly lower. down.
It is predicted that the probability of being as low as 9 degrees is as high as 20%
The article pointed out that according to the latest "Minimum Temperature Probability Forecast", the temperature in Hong Kong will drop significantly next Wednesday, and the weather will be quite cool on Thursday and Friday. There is still disagreement on this."
The chart shows a 40% to 50% chance of forecasting 13 to 17C, and a 10% to 20% chance of going as low as 9C or 16.5C.
When the cold wave hits Hong Kong, the last barrier in the urban area is Tai Mo Shan
The article quoted "Cold Wave Passes Three Passes" and pointed out that the cold air in Siberia needs the help of the westerly trough to pass the first "test" and expand southward; while the high-altitude disturbance generated by the south branch of the westerly trough can provide additional impetus to help accumulate in the The cold air from central China crossed the mountains in southern China (the second "test") and reached the coastal areas of Guangdong.
As the cold air arrives directly from the land, the local temperature will have a large drop; on the contrary, if there is no help from high-altitude disturbances, part of the cold air will bypass the mountains in South China and continue southward along the southeast coast of China. The nature tends to become relatively warmer, and the temperature drop in Hong Kong will be smaller.
When the cold air reaches the northern part of Hong Kong, it still has to cross the nearly 1,000-meter Tai Mo Shan to invade the urban area (the third "test"). Judging from the computer forecast model (Figure 1), the north-south temperature along the coast of Guangdong The difference is quite large. Whenever there is a slight change in the extent of cold air invasion to the south, the drop in local temperature will be different.
The Observatory reminds that weather changes may affect health, and the elderly and those with chronic diseases should pay more attention.
The Observatory predicts that the temperature will drop significantly next Wednesday, and the next two days will only be 14 degrees. There will be continuous rain and traffic｜The highest temperature today will be about 24 degrees and there will be rain for many days in a row. The Observatory expects a sharp drop of 11 degrees next Wednesday. Weather and traffic｜The highest temperature today is about 24 degrees. It is forecast to be cloudy and rainy for many days. The weather turns cold｜The Observatory predicts that the temperature will rise first and then drop. The temperature is about 24 degrees and the forecast is cloudy with showers and thunderstorms
