The warm front is, as well as the cold front, a weather phenomenon associated with a low pressure area. Warm and therefore lighter air masses slide on to the tensile direction lying in front of them heavier cold air masses. The weather events are quieter than cold fronts usually. In the area of ​​sliding up warm air masses only form cirrus clouds followed by cirrostratus, altostratus and then Nimbostratuswolken. The usually even and long -lasting, steady rain begins when the Sun is completely obscured by the Alto Stratus. Moderate or heavy rain then falls out of the nimbostratus. In summer it can also lead to hot -air unit thunderstorms.

In a weather map Warm fronts are marked by red semicircles, which point in the direction of pull.

The air pressure is falling slightly in front of the warm front, behind increasingly falling, the temperature increases with the arrival of the warm front on ( see above course in the diagram). The wind turns in front of the warm front usually back (for example, from south to south -east). After the passage of the front is a significant wind direction change is noticeable, clockwise in the Northern Hemisphere due to the Coriolis force, for example, from south to south-west.

In a low-pressure systems, the warm front moves in front of the cold front. The cold front finally brings the warm front through their higher speed. When sliding on the warm air the warm front keeps losing namely kinetic energy as it is converted to potential energy when sliding up. Due to the loss of kinetic energy of the warm front is getting slower, while the cold front their initial velocity largely retains.

Between warm and cold front is the warm sector. In the region where both the blend air masses creates the occlusion.

  • Pressure areas and fronts