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Monthly precipitation and the 3-month Standardized Precipitation Index (SPI) were used to reveal the patterns of rainfall and severe drought frequency over the East European Plain in the period 1953–2011 in the opposite phases of the quasibiennial oscillation (QBO). Differences of precipitation and severe drought frequency in May and in June in the westward and eastward phases of the QBO phases are explained by circulation variations. The analysis indicates less frequent severe drought events over Ukraine and at the center of the European part of Russia in May in the westward QBO phase due to the intensification of the storm track over the East European Plain. The weather conditions in May and in June in the years of the westward QBO phase were more favorable for the yield. The difference of spring wheat yield in the westward and eastward QBO phase exceeds the same difference of winter wheat yield in the Central Black Earth region and in the south regions. Ukraine and the region to ...

Objectives. The projected spatiotemporal distribution of precipitation in different regions of Ukraine under the climate scenario RCP8.5 for the period of 2020-2050 was defined. Methods. The data of regional climate modeling of the CORDEX project have been used for construction of time series and detection of trends in projected precipitation. Future trends of adverse meteorological phenomena associated with precipitation are estimated using climate extreme indices.

The character of the atmospheric general circulation during summer-season droughts over Eastern Europe/Western Russia and North America during the late twentieth and early twenty first century is examined here. A criterion to examine atmospheric drought events that encompassed the summer season (an important part of the growing season) was used to determine which years were driest, using precipitation, evaporation, and areal coverage. The relationship between drought and the character of the atmosphere, using the Dzerzeevsky weather and climatic classification scheme, atmospheric blocking, teleconnections, and information entropy, was used to study the atmospheric dynamics. The National Centers for Environmental Prediction (NCEP) re-analyses dataset archived at the National Center for Atmospheric Research (NCAR) in Boulder, CO, USA, is used to examine the synoptic character and calculate the dynamic quantities for these dry events. The results demonstrate that extreme droughts over ...

An overview of the meteorological and synoptic conditions for the formation of the severe drought which occurred in 2019–2020 in the southwest of Ukraine showed that the combination of several adverse factors influenced the evolution of the drought over a long period of time. Analysis of two types of drought indices and anomalies in the tropospheric pressure fields showed that the formation of a precipitation deficit began long before the occurrence of drought, due to the repetition of high pressure fields in the region, through which the intensity of the drought increased gradually.

Spatiotemporal distribution has been assessed using time series of the monthly area-averaged soil moisture content of 0-10 cm underground, generated by NASA GLDAS_NOAH025_M model (Giovanni online data system), for period 2000-2019. Calculated Soil Moisture Anomaly Index (SMAI) was used to characterize the degree of saturation of the soil, comparing to normal conditions. The clear annual soil moisture content (SM) course is observed in all agroclimatic zones of Ukraine, when the maximum is observed in February, and the minimum is in August or September. The lowest SM values are fixed in the Western Steppe and the maximum in the Carpathian region and Polesie. The analysis of time series of the SMAI showed that during the study period in summer and autumn months there was a tendency to reduce the interannual amplitude of index fluctuations and observed the transition from mostly positive values to negative ones. In winter and spring, no significant trends were found in the SMAI values....

Znanstveni Ëasopis Hrvatski meteoroloπki Ëasopis nastavak je znanstvenog Ëasopisa Rasprave koji redovito izlazi od 1982. godine do kada je Ëasopis bio struËni pod nazivom Rasprave i prikazi (osnovan 1957.). U Ëasopisu se objavljuju znanstveni i struËni radovi iz podruËja meteorologije i srodnih znanosti. Objavom rada u Hrvatskom meteorološkom časopisu autori se slažu da se rad objavi na internetskim portalima znanstvenih časopisa, uz poštivanje autorskih prava. Scientific journal Croatian Meteorological Journal succeeds the scientific journal Rasprave, which has been published regularly since 1982. Before the year 1982 journal had been published as professional one under the title Rasprave i prikazi (established in 1957). The Croatian Meteorological Journal publishes scientific and professional papers in the field of meteorology and related sciences. Authors agree that articles will be published on internet portals of scientific magazines with respect to author's rights.

The geographical position of the Arctic front and two branches of the Polar front over Europe was determined during the period 1995–2015 using calculated grid fields of the thermal frontal parameter in the troposphere layer of 850–700 hPa. It was revealed that the geographical position of climatological fronts changed both in the cold and warm periods of the year in comparison with climate data. The most recent standard reference period of 1961–1990 recommended by WMO (WMO, 2017) was used for comparison. It is shown that in January there was a shift of the northern and southern branches of the Polar front to the north compared to the reference climate period, and in July the convergence of both branches of the Polar front in the middle latitudes was observed. The Arctic front was characterized by a northern location compared to the climate in both January and July. It is revealed that the main areas of frontogenesis in the cold period of the year were the sea surface, namely, the so...

The study examines spatiotemporal distribution of fire weather conditions during the fire seasons of 1990–2020 in the mixed forests areas of the territory of Belarus and Ukraine using monthly mean Fire Weather Index (FWI) averaged for each administrative area in the study region. It was revealed that the lowest FWI values were observed in the northern and northwestern regions of Belarus, the highest values were in the southeast. On the territory of Ukraine, FWI values increase toward the east regions. In the seasonal distribution, the FWI increases from March to May and in the middle of summer the index reaches a maximum in the all regions. Analysis of the FWI dynamics over the five-year periods showed that the frequency of danger fire weather conditions varied from a "very low" level to "moderate" level most of the study period. In the last pentad 2015–2020, "high" fire danger level began to appear in the south of Belarus and in the northern part of Uk...