关键词: 材性, 材性, 半同胞家系, 遗传变异规律, 遗传参数, 黧蒴栲

Abstract: In order to find out the spring blizzard weather forecast point in Weifang, improve the forecast accuracy and provide a more accurate high quality weather forecast service for local disaster prevention and mitigation work, based on all kinds of conventional data, NCEP reanalysis data and satellite data, the author analyzed comprehensively a blizzard fatality in early spring in Weifang. Results showed that heavy snowfall happened in the deep moist air flows and the thick wet layer; there were multiple upward movement centers, correspond to the activities of the mesoscale convective cloud in the large-scale ascending motion area; this was a convection snowfall. Middle troposphere was a temperature inversion or a small temperature decline rate one. The convective instability energy mainly concentrated in the bottom of the troposphere; satellite cloud image could well reflect the cause the movement and the development of small and medium scale system of the blizzard.