Aviation Weather - Frontal Waves

[BoDEAN]

Quick Question:

This question always haunts me, because I don't fully understand why. If someone could help explain:

If a wave were to form on a stationary front running east and west across the United States, that portion east of the wave would normally....become a warm front and that portion west of the wave would become a cold front.

Can someone explain why this is?

 

[trainerjet]

The "wave" is an area of low pressure which forms on and rides along a stationary front. The airflow around a low is counter-clockwise. Therefore, the area to the east has a southerly flow, and to the west a northerly flow. Hence, warm front to the east, cold front to the west.

 

[BoDEAN]

Thank You