Composite Mean and Anomaly of Synoptic Conditions for Tornadic Days over North Ionian Sea (NW Greece)
Tornadoes and waterspouts are violent phenomena of local scale, which are able to cause damages and in many cases loss of life. Recent studies have given evidence that west Greece is a vulnerable area for tornadoes, waterspouts and funnel clouds to occur. In this study, the composite mean and anomaly of synoptic conditions for tornadic days over the north Ionian Sea were quantified. The daily composite mean of synoptic conditions were based on NCEP/NCAR Reanalysis datasets for the period September 1, 1948 to December 12, 2010, while the composite anomalies were calculated with respect to 30 years climatology (1981–2010) of the synoptic conditions. The analysis of composite mean and anomaly of synoptic conditions was carried out in terms of seasonal variability of phenomena, over the north Ionian Sea, for specific barometric pressure level of 500 hPa and the sea level pressure (SFC). Additionally, the dynamic LI INDEX was analyzed and discussed.
KeywordsActive Season Synoptic Condition Wave Trough Composite Anomaly Lift Index
The authors would like to thank Hellenic National Meteorological Service (HNMS), state authorities, media (blogs, news site, TV and radio stations), the Hellasweather group and all anonymous people, who contribute to accomplish this extensive dataset of tornadoes, waterspouts and funnel clouds over north Ionian Sea area. Daily anomalies images were provided by the NOAA/ESRL Physical Sciences Division, Boulder Colorado.
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