黑龙江春秋季中雨夹雪到暴雪天气形势分析

Analysis of Weather Conditions for Moderate Rain and Snow Mixed and Snowstorm in Heilongjiang Spring and Autumn

摘要: 通过液固混合态降雪过程中，产生纯降雨、雨夹雪、纯降雪的气温界限值，分析产生中雨夹雪以上降水量的天气形势特征，以期为预报雨夹雪、暴雪提供指标。采用2001—2018年3—4月、10—11月天气图、日降水量资料，对比得出了地面、925 hPa、850 hPa、700 hPa形成降雨、雨夹雪、降雪的最高气温上限界值、最低气温下限界值。用天气学方法分析得到4种环流形势能够在24 h产生降水（中雨夹雪、暴雪）量≥10 mm。

Abstract: Temperature thresholds of rain, rain and snow mixed and snow were analyzed based on the characteristics of weather situation. The synoptic maps and daily precipitation data during March-April, October-November from 2001 to 2018 were used.Results show the upper limit of maximum temperature and the lower limit of minimum temperature for producing rain, rain and snow mixed and snow at ground, 925 hPa, 850 hPa, 700 hPa heights. For the range of 700 hPa to 500 hPa, there were four synoptic circulation patterns. It could cause precipitation (moderate rain and snow mixed, snowstorm) of more than 10 mm in 24 hours.