The occluded front

Il fronte occluso meteorologico

The occluded front is one of the least stable conditions in our atmosphere.

It is generated when a cold front meets a warm front. The cold front moves faster and the weather dynamics that are triggered depend on the temperatures of the air masses in play.

In most cases it is spoken of in front of the occluded hot character: in this case the cold air mass of the cold front must be warmer than the cold one of the hot front and will position itself right between the two air masses raising the air further by raising the air further warm of the warm brow.

It sounds like a tongue-in-cheek but in this case we have four different air masses:

  1. Hot Air of the Hot Front
  2. Cold Air of the Hot Front
  3. Cold Front Hot Air
  4. Cold Air of the Cold Front

In some cases, however, a cold front may be found: in this case the cold air mass of the cold front must be colder than the cold one of the hot front and will wedge dwell below the latter causing a sudden raising all three other air masses.

Occlusion difference of a hot or cold front.

The state of the weather in this case is similar to that found in the case of the cold front but with a wider cloud system and intense but short precipitation also of a thunderstorm character.

On the weather maps the occluded front is represented by a line composed of the symbols of both fronts as the one below indicated.

The weather occluded front
Representation of the occluded front

For the correct reading of a weather chart showing the fronts and their interpretation we recommend that you read our articles on Hot Front and Cold Frontfirst.

Reply