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| Titel |
Analysis of synoptic conditions for tornadic days over western Greece |
| VerfasserIn |
P. T. Nastos, I. T. Matsangouras |
| 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 Sciences ; 14, no. 9 ; Nr. 14, no. 9 (2014-09-10), S.2409-2421 |
| Datensatznummer |
250118660
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| Publikation (Nr.) |
 copernicus.org/nhess-14-2409-2014.pdf |
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| Zusammenfassung |
Tornadoes have been reported in Greece during the last few decades and recent
studies have given evidence that western Greece is an area vulnerable to
tornadoes, waterspouts and funnel clouds In this study, the composite means
and anomalies of synoptic conditions for tornadic events (tornadoes,
waterspouts and funnel clouds) over western Greece are analyzed and
discussed.
The daily composite means of synoptic conditions were based on the National
Centers for Environmental Prediction–National Center for Atmospheric
Research (NCEP–NCAR) reanalysis data sets, for the period 12 August 1953 to
31 December 2012. The daily composite anomalies were calculated with respect
to 30 years of climatological study (1981–2010) of the synoptic conditions.
The analysis was carried out in terms of seasonal and monthly variability of
composite means and anomalies of synoptic conditions for specific isobaric
levels of 500, 700, 850, 925 hPa and the sea level pressure (SLP). In
addition, an analysis and discussion about the dynamic lifted index from
NCEP–NCAR reanalysis data sets is presented.
The daily composite mean analysis of 500 hPa revealed a trough line across
the northern Adriatic Sea and central Italy, associated with a SW upper-air
stream over western Greece. The maximum composite anomalies were depicted at
the isobaric level of 500 hPa during autumn, spring and summer,
against winter when the anomaly appeared at 925 hPa isobaric level. In
addition, 48% of tornado events during the autumn season occurred in
pre-frontal weather conditions (cold fronts) and 27% developed after the
passage of the cold front. Furthermore, the main difference in synoptic
patterns between tornado and waterspout days along western Greece during the
autumn season is the maximum daily composite anomaly over the Gulf of
Taranto. |
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