What caused the bad weather when the torrential rain raided Taiwan Province, making it difficult for citizens to push carts in the water?

It's raining hard and fast, and the instantaneous heavy rain in Taipei far exceeds the capacity of the sewer. Xinyi District, the golden zone of Taipei City, is almost submerged, and some places are even waist-deep. People are suffering at the risk of driving through the flood-stricken areas. Typhoon Caiyun is moving in the northeast of the South China Sea and approaching the southern coast of Taiwan Province. A large number of strong three-dimensional thunderstorm clouds have also appeared in eastern Guangdong, southern Fujian and northern Taiwan Province. The appearance of these thunderstorm clouds has brought strong thunderstorms to many places.

Especially in the northern part of Taiwan Province, the radar echo is generally dark red, which shows local strong convective activity and local short-term heavy rain. The rainstorm in Taiwan Province was only caused by the water vapor collected by the cold air in the East China Sea rising in front of the mountain in central Taiwan Province. It is essentially a rainstorm caused by cold air, while Meiyu is a continuous rainstorm caused by air masses with different dew points.

And this cold air is actually the cold air that used to cool down East China and other regions, even warm in spring. If the temperature in a certain area or place is normally distributed under the multi-year average condition, the probability of weather is the highest, the probability of hot and cold weather is small, and the probability of extremely cold or hot weather is small. However, affected by global warming, the average temperature in this area will increase, and the probability of high temperature weather will increase significantly. Rare extreme high temperature weather may also occur frequently, and extreme events such as high temperature heat waves will occur frequently. If the variance of temperature changes increases, extreme weather will appear more frequently.

the main physical conditions of rainstorm are rich and continuous water vapor, strong and persistent upward movement of airflow and unstable atmospheric structure. In particular, the favorable combination of topography will produce heavy rain. Cumulonimbus clouds often rain heavily. The condition for the formation of cumulonimbus clouds is that there should be enough water vapor in the atmosphere, and there is a strong upward movement to transport the water vapor rapidly upward. The water droplets in the cloud are constantly affected by the upward movement until the updraft can't support them, and they fall sharply to the ground. If the rainstorm continues, the safety of the hiding place should be assessed in time. Especially in areas prone to mudslides, please be vigilant and pay attention to external trends so as to change shelters at any time.