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• W3119347736 abstract "The aim of this study is to identify the main mesoscale features and mechanisms responsible for the generation of a very intense precipitation and wind storm event, named “Vaia”, that affected the eastern Italian Alps on 27–29 October 2018. The event was characterized by extreme accumulated precipitation (up to 850 mm in three days) and exceptionally strong winds, causing severe and widespread impacts, such as floods, landslides, and extensive damages to forests and growing stock. The synoptic situation was characterized by a trough, which deepened over the eastern Atlantic, extending to France and Spain, driving a strong moist flow towards the Alpine region. At the surface, a wide cyclonic area developed over the western Mediterranean, east of the trough axis, and moved, deepening, towards northwestern Italy. The storm is investigated using a comprehensive dataset composed of both observations and numerical simulations by means of two models, namely WRF and MOLOCH, at convection-permitting resolution. The analysis highlights that the storm was characterized by two consecutive phases with strong precipitations, both fed by an intense moist southerly flow. In particular, the second phase was also marked by strong wind gusts in the Alpine area, exceeding 50 m s −1 at some weather stations. It is found that these extreme wind gusts were connected to the presence of an intense southerly low-level jet immediately ahead of a cold front, displaying an average wind speed of 35 m s −1 at 1500 m MSL. The comparison between observations and numerical results shows that the main characteristics of the storm are well simulated by both models, confirming the high predictability of this kind of events, typically associated with well-defined large-scale forcing. Also local scale features are reasonably captured by the simulations, despite the high complexity of the Alpine orography. However, WRF significantly underestimates total precipitation amounts over the most affected areas, while wind speed is overestimated by both models in the inner Alpine sectors. • The Vaia storm is analyzed with observations and convection-resolving simulations. • WRF and MOLOCH reasonably reproduce precipitation and wind gusts over the Alps. • A strong low-level jet ahead of the cold front is detected by both observations and simulations. • The variability in the numerical results induced by different global analyses is small." @default.
• W3119347736 created "2021-01-18" @default.
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• W3119347736 date "2021-05-01" @default.
• W3119347736 modified "2023-10-02" @default.
• W3119347736 title "Multi-model convection-resolving simulations of the October 2018 Vaia storm over Northeastern Italy" @default.
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• W3119347736 doi "https://doi.org/10.1016/j.atmosres.2021.105455" @default.
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