This is a bit more... On a local scale it's going to cost a bit more to find,
especially the divergence.
The convergence yes, we have seen it in fact, on surface
when we spoke of backing and veering, of the wind which was parallel.
You remember that, in some cases, that the wind tended to come together,
There we can find convergence on the surface.
So, if this is a wind that comes from here, what will happen ?.
If this is the ground, down it will not be able to go.
Because these are the current lines,
and here the wind is coming.
Where will it go?
Downwards it can not, therefore, what is doing is follow the current,
and go upwards. Therefore,
you will notice that the convergence will give us is rising air.
This rising, if we relate it to the convection, as we mentioned before,
this air is going to be forced to go up and
when it goes up, it will depend on how is the air around it.
If the air forces to continue the rise, here what will form is a
storm or there will be cloudiness and there will be precipitation.
Look here, if this air is going to leave here,
If this is being emptied, a relative vacuum will be created here,
therefore, this void will have to be filled in some way.
Typically if there is a divergence high up, what will happen is
literally sucking the air that is down the bottom.
Therefore, the divergences high up, what they generate is,
a rise of air by suction.
Here there is a kind of hole,
and it has to be filled with the air that comes from the parts below.
Therefore, anything that makes the air come together will generate, on the surface,
... it is going to generate rise at that height, and anything that makes the air
diverge will generate rises in the same way at that same height.
Notice I've said it before.
Do you remember when we had the wind parallel to the coast?