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- Title
Role of a Pacific Easterly Wave in the Genesis of Hagupit (2008).
- Authors
Zhao, Chen; Li, Tim; Bi, Mingyu
- Abstract
The Advanced version of the Weather Research and Forecasting (WRF-ARW) Model is used to investigate the influence of an easterly wave (EW) on the genesis of Typhoon Hagupit (2008) in the western North Pacific. Observational analysis indicates that the precursor disturbance of Typhoon Hagupit (2008) is an easterly wave (EW) in the western North Pacific, which can be detected at least 7 days prior to the typhoon genesis. In the control experiment, the genesis of the typhoon is well captured. A sensitivity experiment is conducted by filtering out the synoptic-scale (3–8-day) signals associated with the EW. The absence of the EW eliminates the typhoon genesis. Two mechanisms are proposed regarding the effect of the EW on the genesis of Hagupit. First, the background cyclonic vorticity of the EW could induce the small-scale cyclonic vorticities to merge and develop into a system-scale vortex. Second, the EW provides a favorable environment in situ for the rapid development of the typhoon disturbance through a positive moisture–convection feedback.
- Subjects
METEOROLOGICAL research; WEATHER forecasting; TYPHOONS; PSYCHOLOGICAL feedback; VORTEX motion
- Publication
Weather & Forecasting, 2022, Vol 37, Issue 12, p2183
- ISSN
0882-8156
- Publication type
Article
- DOI
10.1175/WAF-D-21-0105.1