Continuous thunderstorm activities over one week around northern Taiwan during late August 1999 are investigated in this paper.
Thunderstorms are unusual severe and accompany with the hail report.
The first component of the paper is to explore which the synoptic components, either dynamic or thermodynamic aspect, provide the favor conditions for the storm activities. The focus will be on the interaction of the mesoscale frontal system and the cold core low at 200 hPa.