The study is a comparative analysis of the characteristics of air temperature and atmospheric precipitations in winter seasons from the WMO reference periods (1961 - 1990, 1981 – 2010) compared with last 7 years (2010 – 2016). There is a continuous increase of air temperature in winter, from −2,0°C between 1961-1990, to −1,1°C between 2010-2016, so a heating of 0,9°C. In the last 7 years (2010-2016) the average number of frosty nights (nights with minimum temperature of ≤ −10°C) was reduced by 18% compared to the period 1961-1990 and by 3% compared to the period 1981-2010. In the same period (2010 – 2016), the rainfall were higher in winter, respectively by 17% than during 1961-1990 and by 22% than during 1981-2010. There is an increase of torrential character of precipitation, more pronounced in the southern region of Moldova.

Abstract. The water catchment area of the Trotuş river lies on about 4340 square kilometers of which 66% are in the mountain area of the Central

Abstract:All those who spent our holidays in the countryside to our gradparents or relatives, we heard about the elders' stories about storms that rained frogs and fish.

The study is a comparative analysis of the characteristics of atmospheric precipitations in spring seasons from the WMO reference periods (1961 - 1990, 1981 – 2010) compared with last 7 years (2010 – 2016). In 14 april 2016 a meteorological event was produced in the Iași area who have produced material damage, flooded streets and obstruction of traffic. In the spring seasons of the last 7 years (2010-2016) the atmospheric precipitation amounts were with 8% higher than during 1981 – 2010 and were apropiate on mean value of the 1961 – 1990. In the period of 1961 – 2016 were a continuous increase of the mean number of days with precipitation > 30 mm per day and the half of total number of days with more than 40 mm per day were recorded in the last 16 years. We consider that an increase of torrential character of precipitation in the spring season in Iași area.