1998 global weather

Analysis of March 19-2 1 Severe Convective Weather Process 65438 Abstract: This paper analyzes the complex severe convective weather process from March 19 to March 2 1, and the analysis shows that the special temperature and humidity structure in the troposphere is conducive to the simultaneous occurrence of various weather phenomena. Authors: Zhoushan Meteorological Observatory Zhoushan Meteorological Observatory

Keywords: temperature and humidity structure weather phenomenon, strong convective weather process

Classification number: P458. 1

Text snapshot: 1 synopsis of weather1March, 998 19, a large-scale strong convective weather process occurred in our province. 19-20! N The 24-hour temperature of the young corpse "I Dinghai" dropped to 10.gC, reaching the cold wave standard I and h-n//. Eight is accurate. On 19, the sound changed from the southerly wind of 3m/s to the northerly wind of J hey hyn/Tu/I 26 1/ s, and from noon on 20th, W,113 \/"xi" and "wl" drops appeared everywhere.

The large-scale "Thunderstorm, Rain and Snow" weather process occurred in Jianghuai area on March 20, 1998 (including large-scale abnormal phenomena such as cold wave, thunder and lightning, hail, snow, graupel and rainstorm) was analyzed, and the causes of this process were analyzed from the aspects of weather situation characteristics, physical quantity field characteristics and satellite cloud images. (2) The intensive temperature front on the shear line in the middle and low altitude and the strong baroclinic instability in the temperature and pressure field are the main triggering mechanisms of the abnormal weather in this process; (3) The strong deformation of the southern cold front caused by topography, the steady movement of the deep strong wind speed core on the upper jet axis, and the "ω" distribution of divergence field and vertical velocity field are beneficial to the development of severe convective weather; (4) Strong development of convective cloud belts.