202 1 why does Xi' an like rain in September?
202 1 Why does Xi 'an like rain in September 1. subtropical high
In September, it rained for more than ten days in Xi 'an. Judging from the meteorological data over the years, it is normal for Xi to have more rain in September. In fact, the possibility of the next ten days and a half months is relatively high.
Xi is a warm temperate semi-humid continental monsoon climate with moderate rainfall and four distinct seasons. Winter is cold, windy and foggy, with little rain and snow; Spring is warm, dry, windy and changeable; Summer is hot and rainy, summer drought is prominent, thunderstorms and strong winds; It is cool in autumn. The annual precipitation is 500 ~ 750 mm, mainly concentrated in summer and autumn; Xi is located in the northwest of subtropical high for a long time in summer and autumn, and southwest wind and northeast wind prevail in winter.
In winter, the subtropical high occupies the Pacific Ocean in the northern hemisphere. As the direct point of the sun moves northward, the subtropical high gradually moves northward. The northwest edge of subtropical high is easy to combine with cold air to form precipitation. However, due to the influence of topography, subtropical high intensity and other factors, the spring precipitation is mainly concentrated in East China and South China, which also leads to the precipitation peak in Xi 'an around May. In summer, Xi is controlled by subtropical high, and there are many short-term rainstorms (large precipitation and short duration). When autumn comes, the northwest edge of the subtropical high passes through Xi 'an again when it retreats southward, which leads to continuous precipitation in Xi 'an in September (more precipitation and longer duration).
2. Global warming
The impact of global warming is complex. At present, the overall embodiment of rainfall is the northward movement of rainfall belt, but this northward movement is not just translation. Its scale and scope have local particularity. For example, with the global temperature rising gradually, the rainfall belt moved northward, and from the 1990s to the beginning of the new century, the precipitation in Shaanxi Province gradually decreased.
3. Geographical location
In fact, the Guanzhong basin where Xi 'an is located is not rich in water system, and the water area is relatively small, so it is difficult to form a large number of local thermal convection. In the south of the basin is the Qinling Mountains, which is the highest mountain range in the east. For Sichuan, the southwest airflow of the northwest Pacific subtropical high transports warm and humid air from the Indian Ocean to the Sichuan Basin, where it meets the cold air in the northern part of the Qinghai-Tibet Plateau, resulting in continuous autumn rains in western China in September and June at 5438+ 10. However, due to the existence of the Qinling Mountains, many warm and humid air currents form topographic precipitation during the climbing process on the south side of the Qinling Mountains, making it difficult to enter the Guanzhong Basin, which directly leads to two completely different dry and wet climates in Guanzhong and Hanzhong.
When is the rainy season in Xi 'an? The rainy season in Xi is July, August and September. There are two obvious precipitation peaks in Xi, which are in July and September. Xi The average precipitation in Miko Wu is 558 ~ 750 mm, increasing gradually from north to south. It changes every year.
In September, in the south of China, near the Tropic of Cancer, the temperature is far from dropping, and warm air is still hovering there, waiting for the cold current from the depths of Eurasia (Russian, Siberian) to drive them away.
Not only in southern China, but also in subtropical areas of South Asia and the Middle East (known as subtropical high), they are waiting for the same result. In addition, because the two subtropical highs are all along the coast, a lot of water vapor is also transpiration, but because of the hot weather, there is not much water vapor condensed into rain.
From September to June of 10, the subtropical high moved south and the rain belt returned to the west of China. It is said that there is rainy weather. This continuous autumn rain also has a scientific name, which is called "Autumn rain in western China" and "Autumn rain in Shaanxi". It is common in some areas of western China, and usually appears in Xi in September. Under the influence of the south subtropical high, the weather usually lasts about two to three weeks.
How to dry clothes faster in rainy days 1 Paper towel press
After washing clothes, no matter how you twist them, there will always be a lot of water on them. You can iron clothes with paper towels. Paper towels are very absorbent. Take more paper towels to dry the water on your clothes.
Wring out a towel.
We use a dry towel to help wring it out. First, wrap the wet clothes with a dry towel, and then twist them hard. At this time, the water on the clothes will be absorbed by the towel. It is best to choose a towel with strong water absorption.
3. Add dry towels and shake well.
We can also dry it with a washing machine. We can use the washing machine to spin dry once, and then put one or two dry towels on the second time, so that the clothes after spinning will be drier than usual.
4. Air dryer
If you want to wear it quickly after dehydration, you can only use a hair dryer to accelerate drying. After dehydration and towel drying before use, clothes only contain 10% to 20% moisture at most. It only takes more than ten minutes to dry clothes with a hair dryer.