Welcome to Journal of Agriculture,

Journal of Agriculture ›› 2016, Vol. 6 ›› Issue (1): 103-109.doi: 10.11923/j.issn.2095-4050.cjas15040011

Special Issue: 现代农业发展与乡村振兴 农业气象

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Analysis of an Agricultural Disaster Caused by Weather in Nansi Lake Area

  

  • Received:2015-04-16 Revised:2015-06-15 Accepted:2015-06-25 Online:2016-01-29 Published:2016-01-29

Abstract: The paper aims to improve severe weather forecasting and warning technology in the Nansi Lake area. The author analyzed an agricultural disaster caused by thunderstorm winds and hail in September 19, 2012 in Nansi Lake area which located in the southwestern Shandong Province. The results showed that the favorable condition for the occurrence of severe convective weather was the forward-tilling trough in which the dry and cold air was above the moist and warm air. The dry and cold intrusion which was behind the trough was the trigger mechanism of the strong convection. Strong wind convergence center easily triggered severe convective weather on the ground. A movement direction of the maximum center of K index was consistent with the direction of movement of heavy rainfall. The wind vertical shear of the direction and speed on troposphere were conducive to strong convective storm development. An appropriate height between 0℃ layer and -20℃ layer was conducive to the formation of hail. Composite reflectivity factor and echo tops had certain indication for the region of the hail.