Actas de congresos
Quantitative precipitation forecast with ARPS: sea breeze and heat island effects
Fecha
2014Registro en:
2014 International Symposium on Weather Radar and Hydrology. Washington.
Autor
Vemado, Felipe
Filho, Augusto Jose Pereira
Júnior, Ivon Wilson da Silva
Institución
Resumen
Sea breeze (SB) is a common circulation in the metropolitan area of São Paulo (MASP). Particularly, in the summer, SB triggers deep convection over MASP with heavy rainfall, wind gusts, hail and lightning. All SB episodes between 2005 and 2008 were identified and analyzed by means of surface and upper air measurements, weather radar, satellite and numerical modeling. Oliveira and Silva dias (1982) method was used to identify SB events. The SB inflow through MASP occurs between middle and late afeternoon and injects moisture into this urban environment and triggers deeper thunderstorms, resulting flooding, gust winds, intense enough to put down trees with major socioeconomic impacts. The annual rainfall partition due to SB was estimated using the São Paulo Weather Radas (SPWR). The results indicate a core of maximum rainfall accumulation of 600 mm that is aproximately centered over the MASP. It is about 4 times higher than at the edges of MASP. The ARPS system was used to simulate SB with control and specific runs. Results suggest significant impact of surface cover on the spatial rainfall distribution. Simulations indicate the depth of the SB front may be a condition to trigger at thunderstorm or not. Dual X-band radar (MXPOL) measurements of SBs in MASP were a useful nowcasting tool at very high spatial-temporal resolution.