The boundary of an advancing mass of cold air, in particular the trailing edge of the warm sector of a low-pressure system.
- Although cold fronts associated with southern low pressure systems penetrate the ridge from time to time during summer, they generally fail to produce much useful rain.
- The subtropical highs move from west to east across southern Australia in winter, and further south in summer, usually separated by low pressure troughs or cold fronts.
- The weather man tells me all about high pressure and low pressure, about wind direction, cold fronts, warm fronts and all that.
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