Brief introduction and detailed information of rainfall

The annual rainfall in Huoshaoliao, south of Keelung at the northern end of Taiwan Province Province, China, is as high as 6557.8 mm from 1906 to 1944, and there was a record of 8409.0 mm in19/2 years. It is generally believed that this is the highest annual rainfall record in China. The main reason for the heavy rainfall in Huoshaoliao is that it is located on the northern slope of the central mountain range. In winter, there is a humid monsoon blowing from the East China Sea, and it will rain cats and dogs if the airflow rises slightly. Secondly, it is Pasigat in the lower reaches of Yarlung Zangbo River in the southeast of Xizang Autonomous Region, with an average rainfall of 4495mm in 30 years1931~1960. The following are: Dongxing, Taiwan Province Province, 2646.7mm；; Qiongzhong, 2340.9 mm; Yunnan Jinping, 2267.3 mm

The places with the least annual rainfall in China mostly appear in the western Xinjiang Uygur Autonomous Region and Qinghai Province. Among them, Turpan Basin in Xinjiang, Tarim Basin in Qinghai and Qaidam Basin are the driest areas in China, with annual rainfall generally below 25mm. For example, in Qiemo, south margin of Tarim Basin, the annual rainfall is 18.6 mm; Ruoqiang is17.4 mm; Turpan 16.4 mm; Cold Lake 17.6 mm in Tarim Basin, and Yiwu Naomao Lake (498.3 meters above sea level) near the border between China and Mongolia at the eastern end of Tianshan Mountain in Xinjiang has the least annual average rainfall, only12.0 mm. But this is not the place with the least rainfall at China Meteorological Station. The lowest rainfall is in Toksun (the altitude is less than 1 m) on the west side of Turpan Basin, with an average annual rainfall of only 6.9 mm. According to reports, in the barren Chaletag Desert in the south of Turpan Basin, it doesn't even rain all the year round in some years.

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Distribution according to meteorology, the so-called rainfall is the depth of rain falling to the water level (no leakage, evaporation, loss, etc. ) in a certain period of time. Measure with a rain gauge. In millimeters. When there is precipitation, the weather station measures it every 6 hours. So, how much water is there in a millimeter of rainfall? According to the calculation, a millimeter of rainfall is equivalent to an increase of 667 kilograms of water in an acre of land, which is equivalent to pouring 13 barrels of water.

The amount of water or water that falls in the form of rain in a certain period of time, usually measured in inches of water depth.

The meteorological term rainfall is calculated by rainfall, expressed by the depth of rainwater collected on a plane, with an accuracy of 0.25mm or 0.05438+0 inch. It is sometimes expressed in liters per square meter (1l m-2 =1mm). In meteorological statistics, rainfall can also be called rainfall, that is, the accumulated precipitation in a certain period of time, in which if the precipitation is less than 0. 1 mm, it is regarded as rain trace.

Represents the line between points with equal rainfall on the weather map. It represents the characteristics of rainfall distribution. According to the isohyet condition, the changes of rain area, rainfall gradient and rainstorm area can be analyzed.

Rainfall map The precipitation distribution map of a certain area in a given time period can be divided into years, seasons, months, ten days, days or specific time periods. Weather analysis uses a short period of time, such as a 24-hour rainfall map, to observe the movement and development of weather systems related to precipitation. Long-term weather forecasting and climate analysis use longer time periods, such as annual, seasonal, monthly or longer rainfall maps, to observe long-term weather changes and climate changes. In agrometeorological work, rainfall maps of some crops at certain growth and development stages are mainly used.

The rain level is divided into light rain, light rain, moderate rain, heavy rain and rainstorm. These grades are clearly defined.

Light rain: It means that the rainfall is less than 0. 1mm within 24 hours, commonly known as "Mao Mao rain".

Light rain: within 24 hours, the rainfall is 0. 1 to 10 mm, which can wet clothes. There was a little water on the road, and the mud was all wet, but there was no water.

Moderate rain: within 24 hours, the rainfall 10 to 25mm, the sound of rain can be heard, and there is a small amount of water in the depression.

Heavy rain: within 24 hours, the rainfall is 25 to 50 mm, the rain is fierce and the ditch flows rapidly.

Heavy rain: refers to a large amount of precipitation within 24 hours, with rainfall greater than 50 mm.

Heavy rain: within 24 hours, the rainfall reaches 100 mm or more.

Heavy rain: the rainfall exceeds 200mm in 24 hours.

Shower: This kind of rain will suddenly start and stop. The most urgent time of rainfall is very short, and the intensity changes dramatically.

Therefore, the name of the shower is determined by the nature of rainfall rather than precipitation, and the amount of decline may sometimes be small. Rain mainly comes from cumulonimbus clouds, sometimes accompanied by thunderstorms.