Weather Fronts

What is the difference between a warm weather front and a cold weather front?

A cold weather front is defined as the changeover region where a cold air mass is replacing a warmer air mass. Cold weather fronts usually move from northwest to southeast. The air behind a cold front is colder and drier than the air in front. When a cold weather front passes through, temperatures can drop more than 15 degrees within an hour.

On a weather forecast map, a cold weather front is represented by a solid line with blue triangles along the front pointing towards the warmer air and in the direction of movement.

There is usually an obvious temperature change from one side of a cold weather front to the other. It has been known that temperatures east of a cold front could be approximately 55 degrees Fahrenheit while a short distance behind the cold front, the temperature can go down to 38 degrees. An abrupt temperature change over a short distance is a good indicator that a front is located somewhere in between.

A warm weather front is defined as the changeover region where a warm air mass is replacing a cold air mass. Warm fronts usually move from southwest to northeast and the air behind a warm weather front is warmer and moister than the air ahead of it. When a warm weather front passes, the air becomes noticeably warmer and more humid than it was before.

On a weather forecast map, a warm front weather is represented by a solid line with red semicircles pointing towards the colder air and in the direction of movement.

Again, there is typically a noticeable temperature change from one side of the warm front weather
to the other, much the same as a cold weather front.

If colder air is replacing warmer air, it is a cold front, if warmer air is replacing cold air, then it is a warm front.