Cold Front
![Side view (A) and weather map representation (B) of a cold front](/sites/default/files/media/images/cold-front_lg.gif)
Windows to the Universe, Lisa Gardiner
A cold front forms when a cold air mass pushes into a warmer air mass, as shown in the side view (A). A cold front is represented on a weather map with blue triangles pointing in the direction that the front is moving (B).