The daily 1° × 1° data of the Aviation (AVN) model, the black body temperature (TBB) data of cloudtop, and cloud images by geostationary meteorological satellite (GMS) are used to identify a dew-pointfront near the periphery of the western Pacific subtropical high (WPSH). The results clearly demonstratethe existence of the dew-point front, and its thermodynamic and dynamic structural characteristics areanalyzed in detail. The dew-point front is a transitional belt between the moist southwest monsoon flowand the dry adiabatic sinking flow near the WPSH, manifested by a large horizontal moisture gradientin the mid-lower troposphere and conjugated with the mei-yu front to form a predominant double-frontstructure associated with intense rainfall in the mei-yu period. The mei-yu front is located between 30°and 35°N, vertically extends from the ground level to the upper level and shifts northward. The dew-pointfront is to the south of the mei-yu front and lies up against the periphery of the WPSH. Generally, it islocated between 850 hPa and 500 hPa. On the dew-point front side, the southwesterly prevails at the lov/erlevel and the northeasterly at the upper level; this wind distribution is different from that on the mei-yufront side. Vertical ascending motion exists between the two fronts, and there are descending motions onthe north side of the mei-yu front and on the south side of the dew-point front, which form a secondarycirculation. The dynamics of the double fronts also have some interesting features. At the lower level,positive vertical vorticity and obvious convergence between the two fronts are clearly identified. At themid-lower level, negative local change of the divergence (corresponding to increasing convergence) is oftenembedded in the two fronts or against the mei-yu front. Most cloud clusters occur between the two frontsand propagate down stream in a wave-like manner.
