In late April, especially since the 26th, extremely strong hot and dry air masses and warm and humid air currents have entered the mainland, creating a series of extreme high temperatures, heavy rains, strong winds, hail and even tornadoes. According to the latest news, the strong tornado in Zhongluotan Town, Baiyun District, Guangzhou on April 27 has caused many casualties and huge economic losses.
From the night of April 27 to the day of April 28, the extremely strong convection in Guangxi and Guangdong weakened slightly, but it was still very strong, and the eastern part of the Pearl River Delta and eastern Guangdong rainstormed like a note, with a wide range of heavy rain areas, and Shanwei National Station saw the first local heavy rain of the year, with more than 260 mm of rainfall in 24 hours. In addition, the warm and humid airflow moved north to the Yangtze River basin, and Hubei, Anhui, Jiangxi, Hunan, Jiangsu and other countries also experienced scattered heavy to heavy rain.
In the northward movement with the warm and humid air current, there are also dry and hot air masses. As we said in the last program, after the extreme high temperature on April 27, extreme high temperature occurred again in Hainan, western Guangdong, southwestern Guangxi and Yunnan dry and hot valley areas on April 28, among which Haikou issued the first red warning for high temperature since the implementation of the early warning system, the maximum temperature in Changjiang and other places exceeded 40 degrees again, and Yuanyang, Yunnan Province was 43.4 degrees, breaking the high temperature record in the mainland in April.
In addition, unconsciously, a strong cold air is sweeping Xinjiang, Shaanxi, Gansu, Ningbo, Inner Mongolia and northern Hebei, around April 26, including Urumqi, there was rain to snow and then rain in northern Xinjiang, Altai Mountains, Tianshan Mountains and alpine areas also had heavy snowfall to heavy snow. With the further eastward movement of cold air, from the night of April 27, there was a rare weather in central Inner Mongolia with moderate to heavy rain turning to heavy snow, and there was also snowfall and snow cover in the mountainous areas of northern Hebei.
Among them, the maximum precipitation in 24 hours in Inner Mongolia Zhenglanqi has exceeded 50 mm, of which the snowfall exceeds 30 mm, which is an out-and-out heavy snowstorm level. On April 28, there was a heavy snowstorm, extremely heavy rain, and high temperatures of more than 40 degrees on the mainland (Zhenglanqi in Inner Mongolia, Shanwei in Guangdong, and Changjiang in Hainan).
As soon as the confrontation between warm and cold air intensifies, the weather will also become intense. Before May Day, the main force of cold air will penetrate deep into the south and fight fiercely with the main force of warm and humid airflow. Therefore, from the afternoon of April 28 to April 30, the southern rainstorm, which has weakened slightly, will re-intensify and expand its scope. Heavy rain is not only limited to Guangdong, but also in Sichuan, Chongqing, Hubei, Hunan, Jiangxi, Zhejiang, Fujian, Guangxi, etc., and violent storms and even hail are also coming. Of course, the focus of heavy rain and strong convection is still Guangdong. Due to the strong cold and warm air this time, it is not ruled out that there will be thunderstorms and strong winds, hail and even tornadoes above 10 again, so please pay attention to safety.
From May 1 to May 2, as the cold air infiltrates into South China, the atmospheric energy in most parts of the southern part of the mainland will be greatly weakened, and the heavy rain and strong convection will be extinguished, but it will not end completely; from May 3, with the retreat of the cold air force, the subtropical high will move northward again with a strong warm and humid airflow, and a new round of heavy rain and strong convection will appear in the south until the end of the holiday
。 It can be said that during the entire May Day holiday, except for Yunnan, Hainan and other places, the south was generally rainy, of which the rain from May 1 to 2 was generally mild, and you can travel moderately; from the night of May 3, the rain increased again and became violent again, so you should try to avoid the rainstorm area. Yunnan, Hainan and the Leizhou Peninsula in Guangdong continue to be fine, but Hainan and other places are relatively hot, so they need sunscreen to prevent heatstroke; most of the northern parts are generally sunny, with occasional wind and sand showers, which are not very hot or cold, and are suitable for travel.