Forecast advisory for the late fall heavy rainfall/flood event in central vietnam developed from diagnostic analysis

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Title:	Forecast advisory for the late fall heavy rainfall/flood event in central vietnam developed from diagnostic analysis
Authors:	嚴明鉦;Chen, Tsing-Chang;Yen, Ming-Cheng;Tsay, Jenq-Dar;Alpert, Jordan;Tan Thanh, Nguyen Thi
Contributors:	地球科學學院大氣科學學系
Keywords:	Anomalies;Anticyclones;Cold;Cold vortexes;Cyclones;Diagnostic systems;Earth sciences;Earth, ocean, space;Engineering and environment geology. Geothermics;Exact sciences and technology;External geophysics;Flood forecasting;Floods;Heavy rainfall;Interference;Marine;Mathematical models;Meteorology;Modelling;Modes;Monsoon forecasting;Monsoons;Natural hazards: prediction, damages, etc;Precipitation;Rain;Rainfall;Spectral analysis;Spectrum analysis;Storms, hurricanes, tornadoes, thunderstorms;Time series;Vortices;Water vapor;Water vapor flux;Water vapour;Weather;Wind;Winds;Zonal winds
Date:	2012-10-01
Issue Date:	2026-04-21 13:36:37 (UTC+8)
Publisher:	American Meteorological Society;Boston, MA: American Meteorological Society
Abstract:	摘要： AbstractThe formations of heavy rainfall/flood (HRF) events in Vietnam are studied from diagnostic analyses of 31 events during the period 1979–2009. HRF events develop from the cold surge vortices formed around the Philippines. These vortices’ speed, size, and rainfall, which evolve into HRF events, are enhanced distinguishably from non-HRF vortices, as they reach Vietnam. The HRF cyclone, the North Pacific anticyclone, and the northwestern Pacific explosive cyclone simultaneously reach their maximum intensities when the HRF event occurs. An HRF cyclone attains its maximum intensity by the in-phase constructive interference of three monsoon (30–60, 12–24, and 5 days) modes identified by the spectral analysis of zonal winds. The rainfall center of an HRF event is formed and maintained by the in-phase constructive interference of rainfall and convergence of water vapor flux anomalies, respectively, from three monsoon modes. Forecast times of regional models are dependent and constrained on the scale of the limited domain. For 5-day forecasts, a global or at least a hemispheric model is necessary. Using the salient features described above, a 5-day forecast advisory is introduced to supplement forecasts of HRF events made by the global model. Non-HRF vortices are filtered by threshold values for the deepening rate of explosive cyclones and basic characteristics of the HRF events predicted by the global model. A necessary condition for an HRF event is the in-phase superposition of the three monsoon modes. One-week forecasts for 12 HRF events issued by the NCEP Global Forecast System are tested. Results demonstrate the feasibility of the forecast advisory to predict the occurrence dates of HRF events. 出版者： Boston, MA: American Meteorological Society 出版日期： 2012-10-01 出處： Weather and Forecasting, 2012-10, Vol.27 (5), p.1155-1177 資源來源： Agricultural & Environmental Science Collection 版權： 2015 INIST-CNRS 版權： Copyright American Meteorological Society Oct 2012 版權： Copyright American Meteorological Society 2012 識別號： ISSN: 0882-8156 識別號： EISSN: 1520-0434 識別號： DOI: 10.1175/waf-d-11-00104.1 識別號： CODEN: WEFOE3
Appears in Collections:	[Department of Atmospheric Sciences] journal & Dissertation

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