Cyclones and Associated Cold Front
leading edge of colder air mass

Below is a simple model of a cyclone with a cold front extending to the south from the center of low pressure and a warm front extending to the east ahead of the storm.

At low levels, several air masses of distinctly different origin may be found in varying parts of the cyclone. The cold front marks the leading edge of a colder and drier air mass being wrapped southeastward by north-northwesterly winds behind the low.

Clouds and precipitation usually develop along and ahead of the cold front as the colder air mass lifts the warm moist air ahead of it.

lower dew points
Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.