Warm Air Advection: this is defined by the process of warm air flowing northward towards the colder air replacing it with warmer air. An example would be as follows. Advection is defined as the horizontal or vertical transportation of air.
8AM – South Dakota Temp 66F Winds Southwest 12mph.
8AM – Oklahoma Temp 82F Winds Southwest 20mph.
Now at 1PM the warm air has moved in as the Southwest winds have pushed it northward so the new temps are as follow.
South Dakota 80F – Oklahoma 90F
The winds have transported horizontally the warmer air from Oklahoma northward into South Dakota. This is just one example of warm air advection. Warm Air advection is a huge part of weather forecasting as it is always occurring on a daily basis from place to place. The most common place to see warm air advection is at and just behind the warm front on the weather map.
Second term today is Cold Air Advection, which is defined as the horizontal or vertical transportation of colder air to replace the warmer air. In the following example we can see it occur.
1PM the temp in Nebraska is 76F and there is a cold front to the west of the state. The temp back in Denver Colorado is 45F at the same time. Now at 5pm the cold front has passed through Nebraska and the new temp is now 52F. This is the horizontal transportation of cold air advection by the purpose of a cold front which is just one means of bringing cold air advection. Just like warm air advection, cold air advection is very important to weather forecasting and is always present somewhere in the world at all times.