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Calendaricities, or the occurrence of weather anomalies on fixed calendar dates, are investigated for the Eastern Mediterranean (EM). The anomalies discussed here are the maxima and minima in the frequency of occurrence of the EM synoptic systems bearing rainfall. Those are mostly the Winter Lows passing over Cyprus en route eastward of the Ionian Sea where they are generated in situ or come to from N. Italy. The Winter Lows produce the rainfall over the central and northern EM areas, including Cyprus, Israel, Lebanon, NW Syria, W. Jordan. The southern EM areas, i.e. S. Israel and NE Egypt, get rainfall followed by floods due to the Winter Lows as well, and in addition, due to a small proportion of the mostly dry Red Sea Troughs that occasionally turn out to cause heavy rainfall. The analy- sis of the daily resolved data based on the NCEP/NCAR reanalysis is carried out. A comparison of two 28-yr peri- ods, 1948-1975 and 1976-2003, different in global clima- tology, showed their similarity in the timing of peaks in EM cyclonic activity. The winter was found to have five maxima of cyclonic activity, centered on early February and nearly bell-shaped over their magnitudes. This supports the earlier hypotheses of multimodality in the EM rainfall. The Red Sea Troughs have their main peak of occurrence in the late October - early November, and their small rain-bearing pro- portion falls as well on this period of a year. (in part referred to by Duncan et al., 1965). The "calen- daricity" term was introduced by Brier et al. (1963) in or- der to avoid the confusion with "singularity". These authors rejected the existence of the calendaricities for the rainfall based on data over the entire United States. Then, Portig (1964) pointed that combining the data from too big an area suppressed the calendaricities. He held that calendaricities might be revealed when considering the data within a given region. Godfrey et al. (2002), discussing the existence of the January Thaw over the north-eastern U.S. stations during late January, "have failed to reject the null hypothesis that mere sampling variations have produced" this feature. How- ever, Mapes et al. (2005), via an analysis of the Atmospheric Global Circulation Model simulations showed that the model is able to capture the intraseasonal rainfall peaks.

Calendaricities and multimodality in the Eastern Mediterranean cyclonic activity