What is the concept of rainstorm and how old is it?

"Rainstorm" is what Taiwan Province Province said, which is similar to "Rainstorm" in Chinese mainland and one level higher than "Rainstorm".

Taiwan Province "central weather bureau" stipulates that the daily rainfall exceeds 130mm (mm) as heavy rain, the daily rainfall exceeds 200mm (mm) as heavy rain, and the daily rainfall exceeds 350mm (mm) as heavy rain.

Besides, Hong Kong also has this saying, but it is too big and not very close to Taiwan Province Province and the mainland.

According to the regulations of the Hong Kong Observatory, if the rainfall exceeds 70 mm per hour, it is a rainstorm, and the rainfall on that day exceeds 1680 mm.

(It is not difficult to understand that the geography and precipitation in the three places are different. More importantly, the meteorological departments of the three places are independent, so the usage is different and the standards are even different. )

For example, if the daily precipitation in Taipei exceeds 400, Taipei will not be flooded, while the daily precipitation in Beijing exceeds 350, resulting in the July 2 1 rainstorm accident.