The process of snowstorm responsible for complicated precipitation type and distribution from 20 to 21 January 2013 is examined using conventional observation,NCEP/NCAR and radar data by IM(Ingredients-Based Methodology).The results can be briefed as follows.To begin with cooperation of two high trough,low level shear,and surface front and reverse trough caused the snowstorm.In the second place,the snowstorm depended on four favorable ingredients,including plenty vapor from two southwestward and southeastward flows,strong vertical velocity by low level shear,optimal Precipitation efficiency with appropriate temperature (-15～-14℃) and low temperature.Meanwhile,low longitudinal shear attached importance on the second precipitation center.Besides,the heaviest snowfall occurred while southwest wind in mid-high level and southeast wind got most powerful.Last but not least,with regard to precipitation phase,because of difference of temperature advection in low troposphere,temperature in low level especially 1000hPa and surface is key factor.Temperature under 925 hPa must be analysized particularly when 2 m temperature is at about 1℃.And complex terrain can affect precipitation phase,too.
YANG Chengfang
,
ZHOU Xuesong
,
LI Jing
,
MENG Xiangui
. Study on Shear Snowstorm by Ingredients-Based Methodology[J]. Plateau Meteorology, 2015
, 34(5)
: 1402
-1413
.
DOI: 10.7522/j.issn.1000-0534.2014.00108
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