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Variations of air temperature at 850 hPa in NorthWest Romania. The 850 hPa air pressure level is situated about 1.5 km above sea level. This means that the surface does not influence the temperature at this altitude, so the diurnal temperature variations are small. They are about 2-3 degrees, or they do not exist, at all. This is why temperature of the 850 hPa level is used for identification of air masses and location of warm and cold fronts. Moreover, temperature variation of the 850 hPafatcat:eef4poaip5hnbg3gaucp6nm46i