Analysis of synoptic conditions for tornadic days over western Greece

P T Nastos,I T Matsangouras

doi:10.5194/nhess-14-2409-2014

Abstract

Abstract. 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.

Highlights

Convective weather related to tornadoes (TRs), waterspouts (WSs) and funnel cloud (FC) development could be characterized as one of the most violent of all small-scale natural phenomena
As tornadoes occur in many parts of the world (Fujita, 1973), there have been several studies during recent decades that have presented historical records concerning tornadic activity worldwide (e.g., Meaden, 1976; Peterson, 1982, 1992, 1995, 1998; Grazulis, 1993; Tarrant, 1995; Tooming et al, 1995; Reynolds, 1999a, b)
Matsangouras et al (2014) presented a tornado climatology based on historical data sets (1709–1999) and recent data sets (2000–2012), more than 612 Greek tornadic events were recorded: 171 tornadoes, 374 waterspouts and 67 funnel clouds, within the period 1709–2012

Summary

Introduction

Convective weather related to tornadoes (TRs), waterspouts (WSs) and funnel cloud (FC) development could be characterized as one of the most violent of all small-scale natural phenomena. Matsangouras et al (2014) presented a tornado climatology based on historical data sets (1709–1999) and recent data sets (2000–2012), more than 612 Greek tornadic events were recorded: 171 tornadoes, 374 waterspouts and 67 funnel clouds, within the period 1709–2012. In spite of these historical publications, several researchers have presented/analyzed tornado occurrences and climatology for many European countries describing the spatiotemporal distribution of these tornadic phenomena

Data and methodology

Spatiotemporal variability of tornadoes and waterspouts over western Greece

34 Summer

Seasonal composite anomalies of synoptic