Abstract
Abstract. Satellite images of 30 October 2008 show the development over north-central Italy of rainbands and multiple waves during a strong south-westerly wind episode associated with a deepening synoptic trough and cold front passage. The event was studied by means of the ISAC model chain constituted of the hydrostatic model BOLAM and the nested non-hydrostatic model MOLOCH at 1.1 km resolution. Diagnostics of model output was performed to reveal the physical origin of the dynamical features and precipitation field as simulated. Based on our results we propose a theoretical framework in which symmetric instability underlies some of the observed precipitation patterns.
Highlights
Satellite images of 30 October 2008 show the development over north-central Italy of rainbands and multiple waves during a strong south-westerly wind episode associated with a deepening synoptic trough and cold front passage
The event was studied by means of the ISAC model chain constituted of the hydrostatic model BOLAM and the nested non-hydrostatic model MOLOCH at 1.1 km resolution
MSG Satellite images of 30 October 2008 (Fig. 1) show the development over North-Central Italy of several rainbands and multiple wavetrains during a strong south-westerly wind episode associated with a deepening synoptic trough and cold front passage
Summary
MSG Satellite images of 30 October 2008 (Fig. 1) show the development over North-Central Italy of several rainbands and multiple wavetrains during a strong south-westerly wind episode associated with a deepening synoptic trough and cold front passage. The nearly two-dimensional structure of the large scale flow (Fig. 2) and the ubiquitous orographic forcing makes this a nearly ideal setup to test for the occurrence of slanted circulations developing in a symmetrically unstable environment. For this purpose we used the ISAC model chain, constituted of the hydrostatic model BOLAM and the nonhydrostatic model MOLOCH, to simulate the episode, and performed diagnostics that support the hypothesis that symmetric instability was present during the event
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