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Cut-off low altitude cyclones (COLs) are characterized by the presence of small cold air masses detached from the polar vortex as a consequence of Rossby waves development. Their displacement at a lower latitude is capable to induce higher atmospheric instability and they have a great influence on the amount of precipitation over Romania between April and September. This paper is based on the analysis from a synoptic point of view of the days when the precipitation amount was greater than 10 mm between 1961 and 20...