The climatology of atmospheric fronts crossing Cluj-Napoca city and the weather associated.

GABRIELA VICTORIA HARPA, ADINA-ELIZA CROITORU

ABSTRACT. – The climatology of atmospheric fronts crossing Cluj-Napoca city and the weather associated. In this paper the evolution of weather patterns by tracking various weather variables change as a result of frontal passages through the area of Cluj-Napoca city was investigated, over a period of 10 years (2001 – 2010). The study is focused on warm and cold fronts, while other types of atmospheric fronts have not been considered for this study. Hourly air temperature, sea level pressure, relative humidity, and wind speed have been analyzed. The main conclusions of the study are: the lowest number of atmospheric fronts charaterizes the summer, and especially the last weeks of summer and the first weeks of the autumn, because of the high frequency of anticyclone regime which is dominant over that period, while the most are specific to spring season; the most intense changes in weather parameters (>10.1oC, >10.1 hPa) are much less frequent compared to the moderate (5.1 - 10.0oC, 5.1 - 10.0 hPa) and small ones (0.0 - 5.0oC, 0.0 - 5.0 hPa); the warm fronts had the highest occurrence frequency between 06:00 and 12:00 UTC and the cold fronts between 18:00 and 00:00 UTC.

Keywords: atmospheric fronts, meteorological variables, synoptic analysis, Cluj-Napoca.

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