Fronts

Cold, warm, stationary, occluded

Warm and Cold fronts

  1. Fronts can be cold, warm, stationary, or occluded. A warm front is defined as a collision where a warm air mass is replaces a cold air mass. Warm fronts usually move from southwest to northeast and the air behind a warm front is warmer and has more moister than the air ahead of it. When a warm front passes through, the air becomes warmer and more humid than it was before.
  2. A cold front is defined as a collision in which a cold air mass is replacing a warm air mass. Cold fronts generally move from northwest to southeast. The air behind a cold front is noticeably colder and is drier than the air ahead of it. When a cold front passes through, temperatures can drop 15 degrees or more in the first hour.

Occluded and Stationary fronts

  1. An occluded front occurs when two cold air mass move under a warm air mass and push it up. The two denser air masses may mix and cause colder temperatures below.
  2. A stationary front occurs when a warm front and a cold front collide, but neither has the force to push the other. Thunderstorms form and may last for days.

Stationary Front

What are weather fronts?