Triple‐Doppler radar analysis of the heavy rain event observed in the Lago Maggiore region during MAP IOP 2b

This paper presents analyses of data collected with three ground‐based Doppler radars during the Mesoscale Alpine Programme (MAP) Intensive Observation Period (IOP) 2b from 1900 UTC 19 September until 1100 UTC 20 September 1999. During this period, the synoptic situation was characterized by the pro...

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Bibliographic Details
Published in:Quarterly journal of the Royal Meteorological Society 2003-01, Vol.129 (588), p.495-522
Main Authors: Georgis, Jean‐françois, Roux, Frank, Chong, Michel, Pradier, Stephanie
Format: Article
Language:English
Subjects:
Mesoscale Alpine Programme
Multi‐Doppler analyses
Orographic precipitation
Radar observations
Water budget
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Summary:This paper presents analyses of data collected with three ground‐based Doppler radars during the Mesoscale Alpine Programme (MAP) Intensive Observation Period (IOP) 2b from 1900 UTC 19 September until 1100 UTC 20 September 1999. During this period, the synoptic situation was characterized by the propagation of a deep upper‐tropospheric trough towards the Alps, as often observed when heavy precipitation occurs on the southern slopes of the Alpine massif. A frontal cloud system with embedded convective cells passed over northern Italy in association with the trough moving rapidly eastwards. Ahead of the advancing cold front, a strong south to south‐easterly low‐level flow impinged on the mountains near Lago Maggiore and produced copious amounts of rain (
ISSN:0035-9009
1477-870X
DOI:10.1256/qj.02.46