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Mechanisms for convection development in a long-lasting heavy precipitation event over southeastern Italy (CROSBI ID 171656)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Mastrangelo, Daniele ; Horvath, Kristian ; Riccio, Angelo ; Miglietta, Mario Marcello Mechanisms for convection development in a long-lasting heavy precipitation event over southeastern Italy // Atmospheric research, 100 (2011), 4; 586-602. doi: 10.1016/j.atmosres.2010.10.010

Podaci o odgovornosti

Mastrangelo, Daniele ; Horvath, Kristian ; Riccio, Angelo ; Miglietta, Mario Marcello

engleski

Mechanisms for convection development in a long-lasting heavy precipitation event over southeastern Italy

Observational data and outputs from the Weather Research and Forecasting (WRF) model are used to investigate a heavy precipitation event that occurred on 12 and 13 November 2004 in Apulia and Basilicata, southeastern Italy. The event lasted for more than 24 h and featured two large rainfall peaks, with values up to 250 mmin one day, recorded in two different phases over two distinct areas. The analysis indicates that a low-level jet stream (LLJS) induced by the large-scale pattern maintained a convectively unstable environment and advected moist air masses at very low levels throughout the event. During the first phase, the orography provided the lifting mechanism to develop convection. During the second phase, the convergence developed in the low levels was sufficient to maintain a quasi-stationary linear mesoscale convective system over the nearly flat terrain of Salento peninsula. High-resolution numerical outputs highlight that the shift of precipitation from the first to the second maximum was caused by the passage of a weak mesoscale cyclone and of an upper level short-wave trough. The delay in the modeled evolution of these subsynoptic features is considered responsible of the incorrect timing of the simulated precipitation. The study provides further evidence of the close relationship between the occurrence of a moist and unstable southerly LLJS and heavy precipitation over the Italian Ionian regions.

heavy precipitation; low-level jet stream; WRF

Rad je prezentiran na skupu 5th European Conference on Severe Storms ; Nikolai Dotzek, David M. Schultz (ur.).

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Podaci o izdanju

100 (4)

2011.

586-602

objavljeno

0169-8095

10.1016/j.atmosres.2010.10.010

Povezanost rada

Fizika, Geologija

Poveznice
Indeksiranost