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| Titel |
The severe thunderstorm of 4 October 2007 in Mallorca: an observational study |
| VerfasserIn |
C. Ramis, R. Romero, V. Homar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 4 ; Nr. 9, no. 4 (2009-07-24), S.1237-1245 |
| Datensatznummer |
250006887
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1237-2009.pdf |
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| Zusammenfassung |
| During the afternoon of 4 October 2007, a thunderstorm swept across the
Island of Mallorca from southwest to northeast. Strong straight-line winds
(up to 30 m/s) and heavy rain (rates up to 100 mm/h) were registered
accompanying the storm. Tornadoes with an estimated intensity of F2–F3
developed nearby the city of Palma, severely affecting industrial
installations. One person was killed by the impact of heavy debris while
more than 10 million € in damages were attributed to the event in the
industrial area only. The observed evolution of temperature, humidity, wind
and pressure, as well as the sequence of radar images, reveal that a squall
line was initially organized over the sea and then moved north-eastwards at
an estimated speed of around 80 km/h. This paper presents an analysis of the
event from an observational point of view. The aim of the study is to
contribute to the characterization of these rare events in the Western
Mediterranean by analyzing the observational information available for this
particular extreme event. The diagnosis is aimed at helping forecasters to
identify this kind of organized deep convective events and being able to
issue timely warnings. The synoptic scenario shows warm and moist advection
at low levels over Balearics and an upper-level trough over mainland Spain.
This situation is known to be prone to deep convection in Mediterranean
Spain in autumn. Radiosonde ascents from Murcia and Palma show convective
instability at mid levels that can conduce to develop convection if
appropriate ascents occur. A plausible lifting mechanism to trigger
convection is attributed to large amplitude gravity waves, registered as
short-period pressure oscillations by surface barographs. |
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