Geographia Polonica · 2009 · 42 citations · 20 references
EngineeringExtreme WeatherEarth ScienceSocial SciencesGeophysicsAtmospheric CirculationAtmospheric ScienceApplied MeteorologyMeteorological MeasurementClimate ChangeClimate SciencesMeteorologyMesoscale MeteorologyGeographyCryosphereClimate DynamicsClimatologyCentral EuropeDaily MinimumMeteorological ForcingCold NightsUrban Climate
The daily minimum and maximum temperatures at nine stations in Poland were used in an analysis of the occurrence of coldwaves, where these are defined as days with temperatures exceeding selected thresholds (tmin ≤ -20°C, tmin ≤ -15°C and tmax ≤ -10°C) in the period 1951-2006. Cold nights occurred more often than very cold days and nights but the mean lengths of waves of cold nights were similar – lasting a little more than 2 days on average. The frequencies of extremely cold days revealed a slight, but statistically non-signifi cant downward trend. The occurrence of coldwaves was associated with high-pressure systems over Central Europe and with blocking episodes, but it was always linked with a thick layer of cold air.
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