Journal
ATMOSPHERIC RESEARCH
Volume 56, Issue 1-4, Pages 73-88Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S0169-8095(00)00091-0
Keywords
severe storms; rainfall; tornado; deep convection; supercell storms; synoptic scale meteorology
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Synoptic and thermodynamic characteristics of severe storm outbreaks, including supercells, over northern Italy's Po valley are examined over a 3-year period. Storms are divided into three main categories according to the most relevant associated ground phenomenon: tornado-like, hailfall and heavy rain. For each category, the most common synoptic characteristics are investigated. Sounding data are used to calculate stability indices that help define the storm's environment. Results indicate that the interaction between the synoptic flow and the steep Alpine orography is the key factor responsible for building up the mesoscale circulation that leads to different kinds of severe storms. Some of the stability indices can be regarded as predictors of intense convection. (C) 2001 Elsevier Science B.V. All rights reserved.
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