Front, almost always a cold one, in which the warm air descends the frontal surface, except maybe in the lower levels.
Thermodynamic scale of temperature in which 0 degrees is the point at which all molecular motion ceases (absolute zero), equivalent to -459.7° F and -273.15° C.
Internationally recognized unit for measuring atmospheric pressure. One kilopascal equals 10 millibars.
Worldwide climate classification system in which each climate zone is characterized by annual and monthly means of temperature and precipitation, taking also into consideration vegetation limits. It presents the world pattern of climate and it is a tool for identifying deviations from this pattern.