Abstract:Utilizing conventional meteorological data, the NECP reanalysis data, spring southwest jet warm sector severe convection flow pattern of Fujian is established by using mesoscale convective weather analysis technique. From the perspectives of the four basic conditions for the development of severe convection, namely the instability, moisture, lifting and wind vertical shear, the characteristics of spring southwest jet warm sector severe convection flow pattern of Fujian are revealed. Southwest jet warm sector severe convection flow pattern is characterized by low level strong warm and moist advection over middle and high level troposphere’s dry and cold air. The inversion, warm dry lid, mid low level sufficient water vapor, upper dry and low moist vertical profile, low level convergence and high level divergence are all favorable to the development of severe convection. The severe convective weather is often triggered by the front of surface, the convergence line of surface or 925 hPa, hot low pressure of surface, pulsation of southwest jet. The severe convective weather sustainably develops when the convection moves to the favorable envir onment by the guidance of southwest jet. Strong vertical wind shear with high CAPE is favorable for the sustainable development of convective storm.