The temperature in Changsha in July

Time: August 6, 2007 15: 39: 00 Reading Times:

Weather and Climate in July 2007 This month, the temperature is obviously high, and the precipitation is unusually low, which is the least annual value in more than 50 years. The light is too strong. There have been weather and climate events such as high temperature and heat damage, drought and thunderstorm. I. Overview of Meteorological Elements (see attached table for details) The average temperature of the four stations (the same below) is 30.5℃, which is 0.9℃ higher than last year; The temperature in the city is 30.0 (Ningxiang) ~ 30.9 (East of the city)℃, which is significantly higher than 1.4 ~ 1.9℃. Among them, the early temperature was abnormally high by 2.4 (Liuyang) ~ 3.6 (Ningxiang and Changsha)℃. Ningxiang Station broke the ten-day average temperature record since1971(31.4℃, 1978), and Chengdong Station and 200 1 (0) 0.8 (Liuyang) ~1. In the later period, Ningxiang was 0.4℃ lower, while others were 0.7 (Changsha and Chengdong) ~ 1.2 (Liuyang). The number of high temperature days ≥35℃ is 16 (Ningxiang) ~ 24 (East of the city) d, and Changsha Station is more than the annual average (10d)1day, and the monthly extreme maximum temperature is 38.7℃ (Liuyang and East of the city on the 30th). The average total precipitation is 4 1. 1mm, which is 20.4 (Liuyang) ~ 64.5 (Ningxiang) mm in the whole city, obviously less than 5 (Ningxiang) ~ 9 (Liuyang). The monthly precipitation in Liuyang is the same as the historical record 197 1 year. Less every ten days: there is no precipitation at each station in the first ten days; 3 (Ningxiang) to 7 (Liuyang) years; In the later period, Ningxiang was less than 20%, Chengdong and Changsha stations were less than 50%, and Liuyang had only 0. 1mm precipitation. The rainy season lasts from 3 days (Changsha Station, east of the city) to 7 days (Ningxiang), with 4 days less in Ningxiang and 7 days less in other stations. The average monthly sunshine hours are 272.2h, which is 259.7 (Ningxiang) ~296.0 (Liuyang) h in the whole city, 36 ~ 68 h in Changsha Station, Liuyang and the east of the city, and 6 h in Ningxiang. The distribution of stations and ten days is extremely uneven. In the early stage, Liuyang was generally above 16h, and other stations were slightly less, Ningxiang was below 14h, and other stations were relatively normal. The sunshine percentage is 6 1% (Ningxiang) ~70% (Liuyang). Two. Overview of weather and climate events 1. Main weather processes: in July, the subtropical high in the western Pacific was obviously strong, which affected our city and brought three high temperature and heat damage weather processes to our city; At the same time, due to the eastward movement of the upper trough and the shear in the middle and lower layers, two weak precipitation processes occurred. On June 5438+0, due to the aftermath of the westerly trough, there was weak precipitation in the central and western parts of our city; From 2 to 9, the subtropical high intensified its westward extension, and the first mild high temperature weather process occurred in our city, with the daily maximum temperature ≥35℃. 10 ~ 13, the subtropical high is slightly weakened, but the southwest wind is strong, the sunny and hot weather is slightly relieved, and there is no precipitation; On June 5438+04, due to the influence of low-level shear and weak cold air going south, moderate to heavy rain fell in our city, mainly in Ningxiang in the west. From June 5438+05 to June 5438+07, the subtropical high was stable and quiet, and the weather turned sunny and hot. The second high temperature heat damage began and lasted until the 22nd. Affected by the edge disturbance of subtropical high and weak cold air on the ground, the second rainfall occurred in the city from the afternoon of 22nd to 23rd, with moderate to heavy rain in the city and heavy rain at Ningxiang station. The maximum precipitation is 62.9mm in Weishan, Ningxiang, and the precipitation lasts until 25th. On 26th, the subtropical high intensified its westward extension, and the third high temperature and heat damage weather in our region began and lasted until the end of the month. 2. Main weather and climate events and their impacts In July, weather and climate events such as high temperature and heat damage, drought and thunderstorms occurred in the city. High-temperature heat damage: There were three mild high-temperature heat damage processes this month. In July, the number of days with the highest daily temperature ≥35℃ in the city ranged from 16 (Ningxiang) to 24 (East of the city), and Changsha Station was 6 days more than the same period of last year. Under the control of subtropical high from 2 to 9, there was a mild high temperature weather process in the city from 6 (Ningxiang) to 8 (Changsha, Chengdong), and the extreme maximum temperature in the region was 39.7℃, which appeared in Nantianping, Ningxiang at 7. 16 ~ 22, the subtropical high once again controlled our area, and the city experienced sunny, hot and high temperature weather from 4 (Ningxiang) to 9 (Liuyang and Chengdong). The high temperature process in the east of the city and Liuyang lasted until the 24th, and all of them reached the weather standard of mild high temperature and heat damage except Ningxiang. A new round of sunny, hot and high temperature weather began on the 26th, which lasted until the end of the month. On the 30th, the monthly extreme maximum temperature in Chengdong and Liuyang reached 38.7℃. Drought: The total precipitation in June 5438+0-July this year was 40% less than the average precipitation in previous years, which was the smallest precipitation since June 5438+095 1 recorded, while the evaporation was more than normal 10%, and the average temperature in July was higher than normal 1.7 degrees. The comprehensive influence of many factors has led to the continuous escalation of drought in this city, and a large area of drought has appeared in four counties and five districts. The planned planting area of late rice in the city is 2.49 million mu, and 534,500 mu has been cultivated without water. Of the 6.5438+0.9955 million mu of late rice planted, 7.65438+0.75 million mu has been dehydrated, and 204,800 mu has been cultivated, and 6.5438+0.81.88 million mu is too white, which is 96,900 mu. 260,000 mu of cash crops were affected. There are 108 townships in the city suffering from different degrees of drought, 65438 villagers' groups 144 19000 people have difficulty in drinking water, and 23 township waterworks have difficulty in supplying water due to insufficient water sources. There are 2 17 small reservoirs in the city, 57,600 mountain ponds have dried up and 673 streams have been cut off. The water storage capacity of water conservancy projects in the city is 443 million cubic meters, less than the same period of last year 1 107 billion cubic meters, less than 30% of normal. Thunderstorm: Thunderstorm in July was basically the same as last month. There are 3 (east of the city) ~ 8 (Liuyang) d thunderstorm days in the city, including 2 thunderstorm days in the city. Third, the summary of climate impact In the first half of the year, sunny heat, high temperature and little rain were not conducive to the filling of double-cropping early rice, resulting in high temperature ripening, which was not conducive to the formation of early rice yield and the improvement of rice quality. At the same time, drought elephants began to rise and develop gradually. The weather in Chu Qing is not hot in the middle of the year, which is conducive to early rice ripening and harvesting, drying and returning to warehouse, and tobacco harvesting. However, due to the sunny and hot weather and lack of rain in the middle and late years, the drought is aggravated, especially in the high-lying areas, which leads to the late rice being unable to be ploughed and transplanted in time, which has a great impact on the late rice production. In the later period, the continuous sunny, hot, high temperature and little rain weather will reduce the soil water content, which will have a certain impact on the growth of vegetables (eggplant, spicy beans, etc.). ). It is sunny and hot with little rain, which makes the "second migration" of rice very serious, the insect population rises sharply, the epidemic of diseases accelerates, and the prevention and control of pests and diseases becomes very serious. Climate and urban living environment: the southerly winds are strong throughout the month, and the air quality remains excellent. Climate and fire risk: In July, it was hot and rainy, the whole city was dry and plants withered. High temperature, strong south wind and frequent forest fires. Due to the aging of electrical equipment, urban fires occur frequently. Iv. Climate and Suggestions for Next Month It is estimated that August will be an important period for flood control and drought relief, with high temperature and low precipitation. The continuous high temperature intensifies evaporation, which makes the drought worse. Therefore, it is necessary to attach importance to the water storage operation of reservoirs and seize the favorable opportunity to artificially increase rainfall. We should pay attention to prevent the adverse effects of high temperature weather, do a good job in heatstroke prevention and cooling, and also do a good job in preventing urban waterlogging caused by short-term heavy precipitation. Attached Table: Climatic data table of Changsha City in July 2007: factor temperature (℃), precipitation (mm), rainy days (d), sunshine (h), upper, middle and next month anomalies at the station, Changsha 31.8 30.5 30.2 30.81.9015.7 28.7 44-100.8 3 6548.3 Ningxiang 31.5 29.8 28.9 30.0/klc. 64.5-64.4.171004.3 70.6 84.8 259.76 6.0 Liuyang 30.429.6 30.23088888886

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