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Weather forecast of Henan in May 1 Day

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Last year, affected by La Nina, extreme weather occurred frequently, and this year's weather changes are still fierce.

The most talked about recently is the May Day cooling.

Will May Day really cool down?

Since the Spring Festival this year, the weather has warmed up faster. After the end of April, the temperature rose obviously, and the highest temperature in some parts of the central and eastern regions even reached nearly 30 degrees, which made people feel that summer was coming.

However, at the end of April, when people were still immersed in this heat wave, according to the forecast of the meteorological department, a wave of cold air was coming, which quickly swept through most parts of the country, causing a large-scale and large-scale cooling and rainy weather during May Day.

Since the end of this month, many places in the north have ushered in a sharp cooling weather, and the 24-hour cooling rate has reached 10- 14 degrees.

Then the cold wave continued south. For example, according to the forecast of the Central Meteorological Observatory, the temperature in Changsha will drop from 25 degrees to 15 degrees during May Day, with a drop of 10 degrees.

It is raining harder.

According to the forecast, there will be heavy rain in Henan, Anhui, Zhejiang and other provinces 12 on April 24-27, and the rainfall in Henan and Shaanxi may be extreme or break the historical record.

On the other hand, some areas in eastern Inner Mongolia, southwestern Heilongjiang, northeastern Hebei, Shanghai, central and northern Hunan, and central and northern Zhejiang will have 8- 10 thunderstorm and hail weather, and some areas can even reach 12.

Combined with the weather forecast of May Day holiday, it seems that the great cooling during May Day holiday is a high probability event.

Will there be a "cold spring"?

As for "chilly spring", we have said it many times. The word "cold at the end of spring" originated from agriculture, which refers to the phenomenon that "it is warm before and then cold" during March to May every year in spring, and the temperature in the later period is obviously lower than normal.

From the trend of cooling and rainfall, it shows a continuous feature on the whole, so there may be a regional "late spring cold" phenomenon.

In particular, it needs to be collected about one month before the listing of new wheat. According to the news released by the National Bureau of Statistics, the growth of winter wheat has not reached the level of last year and the same period of last year, mainly because some major wheat-producing provinces were hit by heavy rain last winter, which led to a large area of late sowing in some producing areas. Recently, Henan and other major wheat producing areas have ushered in heavy rainfall, which requires strict wheat harvesting.

Ancestor proverbs are wise.

Although this sudden cooling rain was caught off guard, it was already anticipated in the proverbs of our ancestors.

There is a saying in agricultural proverbs that "autumn tiger comes in August and spring cold comes in March", which means that if the weather of "autumn tiger" appears in the autumn of August of the previous year, it is easy to appear in March of the following year.

Let's think back to last year. Last year, in August of the lunar calendar, the high temperature in most parts of southern China still lasted for more than 30 degrees, which can be described as a complete "autumn tiger".

Therefore, from this perspective, the probability of late spring cold this year is relatively large.

As the saying goes, "If you don't eat zongzi in May, you won't get cold clothes", which means that it won't be a real summer until after the Dragon Boat Festival. When the weather is really warm, the cold clothes can be put away.

Therefore, it is not surprising that there is a sudden cooling weather before the Dragon Boat Festival.

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