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The Intensity of Significant Rainfalls in the Warm Season, in the North-Western Part of Romania. By using the climatic data provided by 11 weather stations in the North-Western part of Romania, measurements have been made regarding the average and maximum intensity of the significant rainfalls, recorded during the warm season of the year (April – October), within the 1975-2006 interval. In the case of the significant rainfalls that have an average intensity under 0.17 mm/min (10.2 mm/hr), amounting up to 93.1%, the highest frequencies of occurrence are during the afternoon and in the first part of the night. The main maximum occurs between 16 and 20 RST (Romanian Summer Time), fact which has been noticed especially in the mountainous and hill areas and in the Maramuresului Depression. The average intensities of 0.17-0.41 mm/min (10.2-24.6 mm/hr), amounting to 6 % can be observed between 14-22 RST. In this case, the highest percentage values occur in the hill areas, in Maramureş and in the plains. The rainfalls characterised by an average intensity of above 0.41 mm/min (above 24.6 mm/hr), effectively reaching the limit of heavy showers, occur at maximum frequency in the afternoon and are determined by the rainfalls which last less than an hour (0.8 %). The maximum intensity of the significant rainfalls occurs most frequently in the afternoon and evening (between 14-20 RST). The analysis of intensity thresholds indicates a decrease in their frequency in direct ratio with the increase of their maximum intensity, so that the rainfalls whose maximum intensity exceeds 1.0 mm/min show no uniform spatial disposition and represent rather random phenomena. In 22.8 % of the cases, the onset of the maximum intensity coincides with the beginning of the rainfall, while in 54.5 % of them the maximum intensity is recorded within the first 20 minutes after the inception of the rainfall.

Keywords: average intensity, maximum intensity, significant rainfalls, North-Western part of Romania