Characteristics of Warm-Sector Rainstorms in Northern Fujian Influenced by the Wuyi Mountains'Terrain
HUANG Daijing
XU Xianhui
YE Guofu
Abstract：Using hourly ground station data,ERA5 reanalysis data,and other sources,this study in-vestigates warm-sector rainstorms in northern Fujian from April to June between 2012 and 2020,summari-zing their weather background and climatic characteristics.The results are shown as follows.(1)Precipitati-on on the northwestern side of the Wuyi Mountains is significantly higher than on the southeastern side,with the windward slope near Huanggang Mountain and the bell-mouthed terrain formed by Dajue Mountain and Mount Wuyi receiving the most rainfall.(2)The peak rainfall of warm-sector rainstorms in northern Fujian occurs from midnight to morning,while the lowest values appear in the afternoon.(3)These rainstorms can be classified into four types:(a)low-level southerly winds transitioning to cold shear passage,(b)warm shear lifting northward under southerly wind control,(c)southerly wind control with upper-level wave dis-turbances,and(d)low-level southerly winds influenced by the subtropical high.(4)Key synoptic-scale conditions for warm-sector rainstorms include a high-level westerly jet,500 hPa fluctuations,a low-lev-el southwest jet,wind speed convergence,a boundary layer jet,and terrain effects.The combined influence of topographic uplift and atmospheric circulation creates a strong low-level convergence center,which,cou-pled with upper-level divergence,provides favorable upward motion for rainstorm development.
Keywords：climatologywarm-sector heavy rainfallmeteorological conditionsMount WuyiNorth-ern Fujian
Publication Date：2025-10-20
Online Publishing Date：2025-10-30(First online date of this platform, not the publication date of the document)
Pages：6( 71-76 )