0 a situation in the weather when a mass of cold air reaches warm air and pushes the warm air up off of the earth's surface
1 a situation in the weather when a mass of cold air reaches warm air and pushes the warm air up off the earth's surface
An occluded front is thus a combination of those two signs.
Initially attached to an occluded front, the low detached from the system and gradually acquired tropical characteristics.
They also can occur under altostratus cloud preceding a warm or occluded front, when cumulus usually lose vertical development as the sun's heat decreases.
In areas where cold fronts catch up to the warm front, the occluded front develops.
When this happens a new low center will form on the triple-point (the point where the cold front, warm front, and occluded front meet).
The point where the warm front and the occluded front meet (and consequently the nearest location of warm air to the center of the cyclone) is called the "triple point".
The occluded front symbol should thus be plotted at the position where the cold air is intersecting the surface, as on the image to the right.
The former occluded front to its northwest became a warm front which moved back to the west around the strengthening, and now dominant, southern low pressure center.
