Bordei-Ion, E. (National Institute of Meteorology and Hydrology, Bucharest, Romania)
Aubert, St. (University of Lyon, Faculty of Geography, France)
For the contries riverane to the Black Sea, the evolution of the mediterrenean cyclones on trajectories that include or at least touch them is an attractive and risky segment of scientific research.
The most important risk factor is represented by anticyclonic formations of different origin air masses, but with high speed of construction and conglomeration above the old continent. These anticyclonic formations (which name will never be please the synoptic) can block, at a certain moment, the way of some mediterrenean cyclons from their formation point to the ending point (which would be the specific way in a normal evolutive cyclon).
The blockage can occur right after the young cyclon appeared above the Mediterranean Sea and then its occlusion will occur very close to the point of its birth, but not very fast, as well as it happened on the 2nd and 3rd of December 1988 to the "Malta" cyclon.
The anticyclonic blockage can prevail also in the latter half of these cyclons lives, the meteorological results being more severe.
The interval 5-7 of November 1995 that we proposed emphasizes the following:
1. The anticyclonic blockage in the maximum phase; 2. The backward deviation of some mezoscale cyclones nucleus of mediterrenean origin which rached the Black Sea had unexpected violent effects in the weather evolution above Romania; 3. The complex aerologic structure above Europe at the chosen moment in time.