ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
A Study of TemporalSpatial Distribution and Synoptic Characteristics of Severe Convective Weather in Beijing, Tianjin and Hebei
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Abstract:
Based on the hazardous weather report, disaster telegraph data and NCEP 1°×1° reanalysis data from 175 stations in Beijing, Tianjin and Hebei from May to September during 2001-2008， the statistical analyses are used to explore the temporalspatial distribution and synoptic characteristics of severe convective weather there. The analysis results indicate that：(1) In this period， the wind force always reaches 7-8 scales with prevailing northerly and westerly winds， the southcentral and northwest of Hebei area, and Beijing and Tianjin have strong winds； Larger hails often occur in Beijing, Tianjin and the northwest and north of Hebei； Within 10-60 minutes， the precipitation easily reaches 20-25 mm， while during 130-180 minutes， the precipitation can reach 50-100 mm. (2) During 2001-2008， the winds often occur in May and June， the hails occur in June， but the shorttime rainstorms occur in July and August； (3) Except for shorttime rainstorms， winds and hails approach to the Taihang and Yinshan Mountains and reduce gradually from northwest to southeast. The severe convective weather has the obvious characteristics of daily variation， a majority of severe convective weathers (62%) occur in the afternoon and early evening (14:00-20:00 BT). (4) There are three main weather circulations： the cold vortex pattern in which mainly appear hails accompanied by gales or shorttime rainstorms， the cold trough pattern in which mainly appear strong winds with shorttime rainstorm， and the trough and subtropical anticyclone pattern which always brings shorttime rainstorms. A weather conceptual model which is established through the typical case has a good significance for weather forecasting.
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