engleski

Analysis of the 12-13 November 2004 heavy rainfall event over Southern Italy

During 12-13 November heavy rainfall affected Ionian regions of Southern Italy causing local floods with relevant impacts on human activities. Rain gauges data showed a non uniform distribution of precipitation with values exceeding 200 mm per day over two different localized areas. Both observational data and the MM5 model results were combined in order to investigate main mesoscale processes and features leading to the event. The synoptic setting, similarly to heavy rainfall episodes in other Mediterranean regions, was characterized by a slow-moving trough exhibiting cut-off circulation ; during 12 and 13 November, the cut-off low moved eastward contributing to onset a low-level jet (LLJ). As revealed by the numerical mesoscale analysis, the convectively unstable LLJ interacted with orography resulting in an important factor contributing to rainfall formation.

heavy rainfall; low-level jet; MM5

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