What is the relationship between air temperature and the density of an air mass in a mid-latitude cyclone? The colder air mass is denser than the warmer air mass.  The cold air travels faster (25 mph) while warm air travels at (10-15 mph) Thus the cold front often overtakes the cyclonic warm front. 

The relationship between air temperature and the density of an air mass in mid-latitude cyclone is that mid-latitude cyclones develop along air mass boundaries which cause the air temperature to drop. Mid-latitude cyclones or migratory lows happen when cold and warm front combines. A cold front forms when a cold air mass interacts with warm air mass while warm front occurs when a warm air mass pushes back a high density of cold air mass.

When the cold air mass or cold front moves toward the equator and then into warm air masses or warm front and when a warm front moves toward the pole, then it would result to a mid-latitude cyclone. When these air masses are greater than the converging air at the surface, mid-latitude cyclones will intensify.