Who can find or remember the coldest day in March 1998? It was snowing that day. Please tell me! ! !
Analysis of the severe convective weather process from March 19 to 21, 1998 Cao Meilan and Xiang Suqing Abstract: This article analyzes the complex severe convective weather process from March 19 to 21, 1998. The analysis shows that the troposphere The special temperature and humidity structure is conducive to the simultaneous occurrence of various weather phenomena. Author unit: Zhoushan Meteorological Observatory Zhoushan Meteorological Observatory
Keywords: Strong convective weather process, temperature and humidity structural weather phenomena
Category number: P458.1
Text snapshot : 1 Weather Overview From March 19 to ZI, 1998, a large-scale severe convective weather process occurred in our province. From the 19th to the 20th, the temperature in Dinghai dropped to 10.gC in 24 hours, reaching the cold wave standard. On the 19th, the wind changed from a southerly wind of 3Im/s to a northerly wind. HeyHyN/土/''I261/S.
Starting from noon on the 20th, W and 113\/"XI""wl fell successively in various places
In response to the large-scale "thunder and snow" weather process that occurred in the Jianghuai area on March 20, 1998 (including A wide range of weather anomalies such as cold waves, thunder and lightning, hail, snow, graupel and heavy rain have occurred in central and northern Zhejiang. The analysis was carried out from the aspects of weather situation characteristics, physical quantity field characteristics, satellite cloud images, etc. , a preliminary discussion was made on the causes of this process. The results found that: (1) The intersection of strong and evenly matched cold and warm air in the Jianghuai region is the main reason for the abnormal weather in this process; (2) The temperature front on the mid- and low-altitude shear line The dense and persistent areas, and the strong baroclinic instability in the temperature and pressure field are the main triggering mechanisms for the occurrence of abnormal weather in this process; (3) The terrain strongly deforms the southward cold front and the deep strong wind speed core area on the high-altitude jet stream axis. Stable less movement and "Ω" distribution of divergence field and vertical velocity field are conducive to the strengthening and development of strong convective weather; (4) The development of convective cloud belts is strong.