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Winter Hydro-Meteorological Risks in Dobrogea. The paper deals with the spatial distribution of some risk hydro-meteors (hoarfrost, white frost, glazed frost, fog) specific to the cold season in Dobrogea. Data were collected and analyzed from 12 weather stations during the 1961-1999 period and 48 rain gauge locations during 1964-1999. During the cold season, the highest frequency of the risk hydro-meteors analyzed was noted within the high land relief of Dobrogea, namely in the Macin Mountains, Casimcea Plateau, Cobadin Plateau, and in the extremely western part of this territory between towns Harsova and Cernavoda as well. Fog was registered over a large number of days, especially in the neighboring area of some towns (Constanta, Medgidia, and Negru Voda). The lowest parts of the valleys that are cooled through night radiation during clear-sky weather present a high frequency of hoarfrost. Here, the thermal inversion regime is often met. The largest area showing a minimum risk hydro-meteors duration for the cold season is located to the eastern part of Dobrogea, along the Danube Delta sea-coast, the big sea-coast lakes, and the Romanian southern coast of the Black Sea.

Keywords: risk hydro-meteors, the hoar frost, white frost, glaze ice, mist