"Travelling Convective Cells" (TCC)
The clouds of this structure emerge probably from “Close Cell” cloud structure.
If the assumption is correct, these cloud form demonstrate certain stability, while they depart from with the wind Close Cells field.
It is not clear, whether there are only the clouds back of convective cells, or the whole convective cells travels also.
In any case some metamorphoses, which happen with clouds, are to be observed.
The large (up to 300 km) separate (if they are emerged from the CCS) cells, which are outlasted the dissolution process, are usually covered with the ravines.
It could be accepted that they developed from the cold air flows, which flow downward from the summit of the cloud form.
Cold dry air drives the water vapour out to lower warmer layers, so that the ravines become finally deep enough and the clouds among them disappear completely.
The remnants in form of mountain combs “live” still longer, after that they will smaller and finally dissolve.
Elements of this structure are seasonally observed as single, but also in groups. Sometimes they go more than thousands of kilometres away from their sources.
They are observed over the warm latitudes.
- In east Pacific in a strip of ±40° above equator,
- In west Pacific above [+15°, +40°] and [- 15°, - 40°],
- In Atlantic above [+5°, +40°] and [+2°, -40°],
- In Indian ocean above [- 2°, -40°].
Sometimes it is nevertheless very difficult to say, where they came from, which field of “Close Cell” cloud could be the source for it.
This refers to the fact that some travel cells can have another origin than “Close Cell” cloud structure.
In this sense the “Mid-Atlantic Amazon Cloud Province” [in a rectangle with coordinates top-left (+30°, -55°) ÷ down-right (+5°, -40°)] is particularly interesting.
There the “travel cells” are seasonally observed as the knots of a regular net. They are relatively small (starting from 30 km), have a star-like shape and dissolve fast. It is not clear, where they are come from.
The “travel convective cells” form also the season-conditioned “Coral Sea Cloud Province”.