Recently, heavy rainfall has continued in some parts of southern China, and some cities in Guangdong and Guangxi have experienced heavy rain to heavy rain and local heavy rain, resulting in multiple ponding in urban areas, multiple vehicles being flooded, and some pedestrians being trapped, which has caused serious impact on the safety of people's lives and property and normal travel. Since May, Lhasa has entered the flood season. The Lhasa Meteorological Station has predicted the precipitation in the flood season of 2024 in Lhasa, and reminded us to do a good job in disaster prevention and mitigation such as flood control and drainage.
In 2023, the total precipitation in Chengguan District of Lhasa will be 439.6 mm, which is normal compared with the same period of the year (469.3 mm); The total precipitation in the flood season (May to September) is 398.7 mm, which is normal compared with the same period of the year (446.8 mm). From the precipitation of eight heat island stations in Chengguan District, the total precipitation of each station is 312.3~463.6 mm.
According to the monthly precipitation statistical analysis of Chengguan District in Lhasa in 2023, the urban precipitation is mainly concentrated from June to August, 374.6 mm, accounting for 85% of the total annual precipitation. According to the analysis of seasonal precipitation distribution characteristics, the precipitation in winter 2023 (December 2023 February 2024) is 11mm, the precipitation in spring (March May) is 45mm, the precipitation in summer (June August) is 374.6mm, and the precipitation in autumn (September November) is 11.9mm. Compared with the same period of the normal year, the precipitation in spring, summer, autumn is less, and winter is more.
According to the prediction of Lhasa Meteorological Station, the total precipitation in Lhasa urban area will be slightly less and the temperature will be higher in the flood season (May to September) of 2024. In early summer (May to June), there is a period of high temperature and little rain in the city; There is a period of concentrated precipitation in midsummer (July August). The rainy season starts late. The specific forecast is as follows: the total precipitation in May is less, and the temperature is 1~2 ℃ higher; The total precipitation from June to August is relatively small, and the temperature is 1~2 ℃ higher; The precipitation in September is normal and slightly less, and the temperature is 1~2 ℃ higher.
The meteorological department gives suggestions on disaster prevention and mitigation. In early summer (May to June), there are periods of less rain in main agricultural areas, the temperature is high, and the probability of mild drought is high, so the irrigation work of non conservation irrigation land should be strengthened; It is necessary to do well in the prevention and control of diseases and pests in agricultural areas; At the same time, the fire risk level of forest and grassland is high, so fire prevention measures should be taken. The precipitation in midsummer (July August) is generally low. Based on the frequent occurrence of severe convective weather in flood season in Lhasa, it is necessary to prevent the adverse effects of secondary disasters such as torrential floods, landslides and debris flows that may be caused by strong precipitation and severe convective weather on major project construction, transportation, power supply and communication guarantee; It is necessary to strengthen flood control in small and medium-sized rivers and urban waterlogging prevention.
In addition, in the context of global warming, the weather and climate in Lhasa are complex and changeable, and prone to extreme weather. Lhasa Meteorological Station will closely monitor the weather and climate change in flood season, timely release monthly and quarterly rolling revised forecasts, and update services in real time. (Zhao Yue)
(Editor in charge: Dan Zengzhuo, Wu Yuren)
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