On the afternoon of July 4, according to the Fengyun-4 high-definition visible light satellite cloud map, Typhoon Airi gradually moved eastward on the East China Sea today, and has begun to approach the Japanese archipelago . Its peripheral circulation has begun to cause rainfall in Japan. In the central and eastern regions of my country, Typhoon Siam, which made landfall on July 2, is becoming more scattered today. This means that it has further weakened. The Central Meteorological Observatory announced today that it will stop numbering it.
Although Typhoon Siam has further dispersed, its impact has not completely ended. On today's satellite cloud image , you can still see that the spiral shape of Typhoon Siam is actually relatively intact, and sufficient water vapor is still there. Further follow Typhoon Siam as it moves northward. On satellite cloud images, a large number of vigorous convective clouds emerged within Typhoon Siam's circulation, which means that internal convection activities are still very strong.
corresponds to the emergence of a large number of convective clouds on the satellite cloud map. This evening, the central China radar puzzle shows that a large number of orange-red radar echoes have emerged in Hunan, Hubei, Jiangxi, Anhui, Henan and other places, and some areas also appear dark red. This is The remnants of Typhoon Siam are changing shape as they move northward. With the addition of mid-latitude inland air masses, Typhoon Siam is currently transforming from a tropical system to a temperate system, which we call "typhoon variability". During the process of typhoon degeneration, the warm and moist air carried by the typhoon body will collide fiercely with the completely different air mass , often causing shocking heavy rains. In history, typhoons that degenerated on land almost all caused severe heavy rain disasters. For example, Typhoon No.19711 was in Bohai, Typhoon Dawei in Liaoning in 2012 and Typhoon Wembia in Shandong in 2018.
However, compared with the large-scale heavy rainfall brought by the typhoon landing, the heavy rain during the transformation of the typhoon remnant vortex is a bit different. This feature is that the scope is not that large, but the intensity is sometimes very large, and even appears. Very severe single-point local heavy rain. The forecast from the Central Meteorological Observatory points out that from tonight to tomorrow, under the combined influence of the remnant vortex and wake of Typhoon Siam, there will be large areas of heavy rain in Huanghuai, Jianghan, Jiangnan, and South China, and the heavy rain area may be single-pointed. There may even be heavy rain in some areas.
From the current point of view, as the cyclone system after the degeneration of Typhoon Siamba continues to move northward, the huge rainfall belt caused by this cyclone system will run through the north and south of my country. In this rain belt, it is not ruled out that there can be extremely heavy rains in some places. . According to the precipitation forecast of the Central Meteorological Observatory, not only the heavy rain caused by the remnants of Typhoon Siam will fall to Henan and Shandong, but it may also cross the Bohai Sea and enter the northeastern plains of from July 6 to July 7, in central Liaoning and western Jilin. There are heavy rains in some areas.
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