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本文根据沈阳农学院气象站的观测资料,分析了1982年4月8日出现的一次大风降雪天气。并结合天气图,研究了产生此次天气过程的原因。这是一次中等强度的冷空气活动,是西风带的短波活动,是高空槽线过境直接造成的。当高空槽线经过本站时,700巴毫高度上的强偏北气流引起动量下传造成地面风速增大,因而造成大风降雪天气。4月份正是我省备耕春播大忙时节,准确掌握并预报这种类型的天气过程对于确定作物安全播种期,保证全苗是很有意义的。
Based on the observation data from the Shenyang Agricultural College Weather Station, this paper analyzes a gale snowfall on April 8, 1982. Combined with the weather map, we studied the reasons for the weather process. This is a medium-intensity cold air activity, which is a shortwave activity of the westerly belt and is a direct result of the transit of the upper trough line. As the upper trough line passes through this site, a strong northerly airstream at a height of 700 bar will cause the wind speed to increase due to momentum transfer, which will result in windy and snowy weather. April is the busiest season for the preparation of spring planting in our province. Accurately grasping and forecasting this type of weather process is of great significance in determining the planting security of crops and ensuring the whole seedlings.