Why did it rain continuously for more than a month this spring?

The situation is stable. Specifically, first, the south branch trough and the western Pacific subtropical high in the low latitude area are extremely active and stable, which is very conducive to the transportation of warm and humid air to the north; Second, the stable situation of two troughs and one ridge at high latitudes is very conducive to the accumulation of cold air and the southward movement. In this weather situation, cold and warm air frequently meet over our province, resulting in continuous rainy weather. Cold and warm air has the same strength and lasts for a long time. In layman's terms, it is the cold and warm air that keeps "fighting" in Hubei, resulting in continuous rain.

Will the continuous low temperature and rainy weather postpone spring this year? Du, a senior engineer of Wuhan Regional Climate Center, said that in climatology, the average daily temperature exceeds 10℃ for five consecutive days, which is called entering spring. The spring season in our province is March 1 1, and the earliest spring season in Wuhan is February 20+0997, and the latest is April 6. When to enter spring needs to be judged according to the weather trend in the later period.

The precipitation in several weather stations reached the highest level in history.

Liu Kequn, a senior engineer at Wuhan Regional Climate Center, said that the first feature of the recent climate is that the precipitation at several stations has reached the highest level in history. According to meteorological data, since the winter of 20 18, 12 and 1, there has been a rare continuous rainy weather in Hubei. As of February 20 19 and 17, the accumulated rainfall in eastern Hubei reached more than 200mm, of which Xianning reached 285.7mm, and the accumulated rainfall in counties and cities such as Hong 'an, Macheng and Yingshan 1 1 ranked second in history. The cumulative rainfall in Wuhan since 65438+February 1 is 1 87.3mm, ranking second in the same period in history, only lower than the historical rainfall of 210.7mm/location (1968 to 1969).

The second feature is that the sunshine hours are few, and the sunshine hours of most substations are the least in history. From 20 18 12 1 to 20 19 17, the average cumulative sunshine hours in Hubei Province are only 99 hours, which is 168.8 hours less than the historical period. Except for individual stations in western Hubei, the historical ranking of most parts of the province is reciprocal 1. The cumulative sunshine hours in Wuhan are 106.5 hours, and the average daily sunshine hours are only 1.3 hours, which is more than 70 hours less than the penultimate 180 hours in the same period in history (from 2009 to 20 10), which is the lowest in history. Due to insufficient sunshine, the high temperature can't go up, so the average temperature is low. Fortunately, the temperature performance this winter is relatively stable and extreme.

How to prevent continuous rainy weather? Liu Kequn pointed out that this kind of weather has a serious impact on greenhouse crops. At present, vegetable planting in spring is affected. Long-term high humidity and less sunshine reduce crop immunity, which is not good for crop root growth. It is necessary to strengthen pest control, clean ditches, reduce soil moisture and maintain soil fertility.

He Mingqiong, chief meteorological service officer of the Provincial Meteorological Service Center, reminded travelers to pay attention to driving safety and plan driving routes in advance. In addition, continuous rainfall and staged low temperature will increase the power load, and some power lines in western mountainous areas and Xianning mountainous areas will fall down due to wire icing, so attention should be paid to power safety.