Diagnostic Analysis of a Strong Cold Wave Over Henan Province in April 2006
Abstract：By using 1 ° × 1 ° NCAR/NCEP reanalysis grid data, a strong cold wave weather was diagnosed by analyzing the heat factor and power factor, which happened in Henan province during April 11- 12, 2006. The results showed that the cold air coming from west load and east load co-act with warm advection to induce the development of Mongolia cyclone, on the other hand, lead low trough and cold front eastward movement and southward push down, which produce the cold wave process. The vertical velocity in different stratification conditions is beneficial to pre-warming and post-cooling sharply in Henan. The strength variety and movement of sinking branch of the secondary circulation stimulated by ageostrophic wet Q vector, has a good relationship with the change of windy weather in Henan. The movement and development of vertical helicity area with great value has a good indication for the gale loading zone.
Keywords：cold wavediagnosis analysisQ vectorvertical helicity
Publication Date：2011-08-08
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 40-45 )