When is Huangmei season?

Question 1: When is the Huangmei season? Huangmei season: In May, plums in the south of the Yangtze River turn yellow and mature, which often becomes "plum rain season" when it rains repeatedly, so the plum rain season in the south of the Yangtze River is called "Huangmei season". Guests from Zhao Shixiu.

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(Song) Zhao Shixiu

It rains at home on Huangmei Arc Festival, and frogs are everywhere in the grass pond.

Didn't come in the middle of the night, knocked on the chess pieces and dropped the snuff.

Question 2: When is Huangmei season? Will the temperature drop? Huangmei season refers to the natural climate phenomenon of continuous rainy weather from mid-late June to early July every year, also known as "Meiyu season".

In rainy season, the air humidity is high, the temperature is high, and clothes are easy to get moldy. Some people call it "moldy rain".

Question 3: When did Shanghai Huangmei season come to the middle and lower reaches of the Yangtze River in China? Usually the rainy season is from mid-June to early July every year. In the past few days, the sky has been gloomy and the precipitation has been constant, sometimes big and sometimes small. Therefore, there is a popular proverb in southern China: When the rain hits Huangmei's head, there will be no sun for forty-five days. Continuous rain, high temperature and high humidity are the main characteristics of plum rain.

Very different from the climate in the same latitude area, Meiyu refers to the weather and climate phenomenon that occurs in a certain area and a certain season. It is found that Eurasia is between 20 N and 40 N, which is alternately controlled by subtropical high and westerly belt. The west coast of the mainland is controlled by the downdraft on the east side of the subtropical south pressure in summer, with sunny weather, partly cloudy and dry climate; In winter, under the influence of westerlies, warm and humid air is brought from the Atlantic Ocean, resulting in more precipitation and a mild and rainy climate. That is, subtropical climate, dry in summer and humid in winter.

The east coast of the mainland is controlled by the west side of subtropical high in summer, and the downward flow is dry, but it absorbs a lot of water vapor from the warm and humid sea surface, bringing abundant precipitation and producing a subtropical humid climate. Due to the strong contrast between land and sea, a unique monsoon climate has formed here, which is characterized by rainy summer and dry winter, with rainfall concentrated in summer, which is just the opposite of the Mediterranean climate.

If compared with the east coast of Britain at the same latitude, it is also very different. There will be no rainy weather for a long time before and after the summer monsoon in the mid-latitude zone of the east coast of the United States, and people do not feel the feeling of sultry weather for a long time, so it is difficult to appear moldy. It can be seen that the precipitation season at the same latitude varies greatly. So there are only Huangmei in the middle and lower reaches of the Yangtze River in China, starting from the area east of Yichang and 29-33 degrees north latitude, as well as the southeast of Japan and the southernmost tip of the Korean Peninsula. In other words, Meiyu is a unique weather and climate phenomenon in East Asia and the middle and lower reaches of the Yangtze River in China.

Question 4: When does Huangmei season start and end? Meiyu-A continuous rainy period from the Yangtze River valley in China to southern Japan in early summer. Because the plum is yellow and ripe, it is named.

Meiyu is produced in the front area of the western Pacific subtropical high edge (called Meiyu front), which is the product of the interaction between polar air mass and subtropical air mass. The location and stability of the Meiyu belt are closely related to the location and intensity of the subtropical high (the ridge line is generally stable between 20 and 25 north latitude), and also related to the circulation situation that the westerly belt is not conducive to the cold air moving south to the Yangtze River basin. At the beginning of June every year, when the atmospheric circulation situation is greatly adjusted, the ridge line of the western Pacific subtropical high jumps to the north of 20 north latitude, and people begin to blossom. When the ridge line of the western Pacific subtropical high jumps further northward and crosses 25 north latitude, the meiyu period ends and the Yangtze River basin enters the summer drought period.

Meiyu in Meiyu season

Meiyu refers to a period of continuous rainy weather from mid-June to mid-July and early summer. The middle and lower reaches of the Yangtze River in China refer to the range of 28 d 34 N east of Yichang or the narrow area from Jianghuai Valley to southern Japan. During this period, due to the monsoon adjustment of atmospheric circulation, the warm and humid airflow from the ocean and the cold air from north to south continue to meet in the Jianghuai Basin, forming an east-west quasi-static front, commonly known as Meiyu Front, which makes the rain continuous and the rainstorm concentrated. It is called "Meiyu" or "Meiyu weather" because it is in the yellow ripening period of plums in the south of the Yangtze River. Because of the high temperature and humidity at this time, clothes are prone to mildew, also known as "mildew rain".

During the meiyu period, a stable and lasting rain belt was maintained from Jianghuai Valley to southern Japan. The distribution of rainstorm in rain belt is uneven, and there are often multiple rainstorm centers. The rainstorm intensity of Meiyu front is generally much smaller than that of typhoon, but the flood disaster area caused by Meiyu front is generally larger than that of typhoon because of its long duration and wide rainstorm range. For example, 199 1 and 1999, the rainy season in the Jianghuai basin lasted for two months, and heavy rains and serious floods occurred in the lower reaches of the Yangtze River, Taihu Lake and Huaihe River, which is rare in history. Taihu Lake, Lixia River, Chuhe River and Qinhuai River all have the highest water levels in history.

The atmospheric circulation conditions that form the Meiyu front rainstorm generally include:

(1) There are blocking high pressure or stable high pressure ridges in the middle troposphere at high latitudes in Asia, and the atmospheric circulation is relatively stable and rarely changes;

(2) The westerly circulation in the mid-latitude area is flat, and frequent short-wave activities provide cold air conditions for the Jianghuai area;

(3) The western Pacific subtropical high has an obvious process of extending westward and jumping northward. The ridge line of the 500 HPA subtropical high is stable between 20 and 25 degrees north latitude, and the warm and humid air flow is transported from the edge of the subtropical high to the Jianghuai basin.

Under this circulation condition, Meiyu front lingers in Jianghuai basin, often accompanied by southwest vortex and shear line. Mesoscale systems such as frontal cyclones are very active on the Meiyu front. This not only maintains the continuous precipitation during the Meiyu period, but also provides abundant water vapor for the rainstorm. Meiyu front rainstorm is a special weather in a specific area formed by the interaction of circulation systems of different scales.

Due to the variability of atmospheric circulation, the "in" and "out" dates of Meiyu are different every year, and the difference between morning and evening can reach more than 40 days. In some years, the Meiyu front is particularly active, and heavy rains are frequent, causing floods. Sometimes the plum rain front is not obvious, and there will be a phenomenon of "less plum" or "empty plum". For example, in 1954, 199 1 year, and 1999, the meiyu period was particularly long, and there was a lot of precipitation, which caused floods in the Jianghuai basin. However, in 1994, the compensation was less, which made the Jianghuai area look unusually dry. In other years, the Meiyu belt will move northward and then return to the Jianghuai basin to maintain relative stability, which is customarily called "inverted Huangmei". For example, Huangmei in August of 1980 has a great influence on agricultural production in various parts of Zhejiang. This abnormal situation in meiyu period is often related to the abnormal change of global atmospheric circulation.

Under normal circumstances, after the first ten days of July, the meiyu in Jianghuai Basin ended from south to north, the frontal rain belt moved to North China, and the Jianghuai Basin entered the summer drought weather with high temperature and little rain.

Question 5: How is the Huangmei season defined? The rainy season has begun

Also known as "entering the mold" and "entering the plum blossom". Refers to the day when the rainy season begins.

According to the principle of combining circulation conditions with regional precipitation, from late May to early July, the ground peak activity is frequent within the range of 29-33 north latitude, with six rainy days for two consecutive periods. At the same time, referring to the lower reaches of the Yangtze River, the average temperature of each station is basically stable above 22℃, which is the start date of entering Mei. In the time curve of rainy days, rainfall, cloud cover and other climatic factors in early summer, there are also days (days) that suddenly increase (that is, there is a turning point) as the average weather (day) field of plum blossoms.

Traditionally, in China, the judgment of plum entry and plum exit is based on the combination of solar terms and branches. According to the calendar, the first third day after mango seeds is plum blossom, and the first last day in Xia Hou is plum blossom. If the weather on the awning day is C, it is designated as entering the plum blossom, and if it is not in the shallow summer, it is designated as leaving the plum blossom.

In ancient China, there were several rules for entering Mei. In trivial records, "(Min people) entered Mei on Geng Day in Xia Hou." "Shenshu Jing": "After the awn is planted, it will enter the plum in three days." "Jiangnan Record": "Plant mangoes in May, and meet your wife and enter Mei." "Tian Wu Jia Xing": "The rain after the awn seed is Huang Meiyu", and the awn seed is considered as plum blossom. There are two reasons for the above differences: first, regional differences; Second, the date of entering Mei for many years often changes. At present, in the almanac of our country, the saying of Shenshu Jing is adopted. In the weather analysis and forecast, it often refers to the day when the weather situation turns to Meiyu situation.

For example, on June 6, 2006, mango seeds will enter Mei on the same day. July 17 coincides with a weekend after the intense summer heat, so the plum blossom date in 2006 is July 17. Huangmeitian ***42 days.

Question 6: When is the rainy season in Huangmei? Meiyu is a unique weather and climate phenomenon in the middle and lower reaches of the Yangtze River in early summer. From the middle and late June to the early summer of July every year, the middle and lower reaches of the Yangtze River (or Jianghuai Basin) often have a continuous rainy period, which is the result of the stagnation of the Yangtze River Basin during the northward movement of the main rain belt in eastern China. It is a rainfall process formed by the intersection of cold and warm air in the north. At this time, it is the mature period of plums in Jiangnan, so it is called "Meiyu". The ancient poem "It rains at home in Huangmei season and frogs fall into the grass pond" vividly depicts the natural scene of the local rainy season. Because of the high humidity and temperature in the rainy season, clothes are easy to get moldy, so it is also called "mildew rain". After the rainy season, midsummer followed.

Except China, there are plum rains in the southernmost part of South Korea and south-central Japan, but not in other parts of the world at the same latitude. Therefore, Meiyu is a unique weather and climate phenomenon in East Asia.

Meiyu area in China starts from Huaihe River in the north and ends in the middle of Fujian, Jiangxi and Hunan provinces in the south, roughly between 27-34 N east of East longitude 1 10, and the length of Meiyu period is the longest in the middle of Meiyu area. On average, Shanghai entered Mei on June 15, and blossomed on July 9, with a length of 25 days. Generally, there are only about 20 days near the north-south boundary line in Meiyu area. But this is the average climate, which may change greatly every year. For example, in the morning and evening, the plum blossom period can be 40 days apart, and the plum blossom period can be 45 days apart; The longest meiyu period can be as long as 60 days or even longer, and some years are even longer, while some years have basically no meiyu, which is called "empty plum". The year with the highest rainfall in Meiyu period is 1954, and the total rainfall in Meiyu period in that year is more than twice the average for many years.

Question 7: How long is the Huangmei season? In June and July every year, there is a long period of special hunger weather in the Yangtze River and Huaihe River basins in China: at this time, the rain is greatly increased, and sometimes it is sunny and rainy several times a day; The humidity in the air is greatly increased, and clothes are often moldy. This is the rainy season; There is also a saying among the people that it is rainy. "There is no Huangmei season in other places.

Question 8: What season is Huangmei? Huangmei season: In May, plums in the south of the Yangtze River turn yellow and mature, which often becomes "plum rain season" when it rains repeatedly, so the plum rain season in the south of the Yangtze River is called "Huangmei season". Guests from Zhao Shixiu.

make an appointment

(Song) Zhao Shixiu

Mei Huang Shi, every family was flooded by rain, and the pond was covered with green grass and frogs.

Didn't come in the middle of the night, knocked on the chess pieces and dropped the snuff.