This part of the theory shall not be understood  as a alternative or in conflict with the prevailing theory of the cause of atmospheric low pressure It do only show that we have overlooked something. This fact become especially clear when we so fare has failed to understand the cause of a hurricanes quit and sunny eyes. More about this in the next chapter, and why aa inner low pressure of a hurricane can become so huge.

The force of gravity contributes to the strengths of a atmospheric low pressure.

Even a cloud has in its centre a certain (small) amount of space vacuum (read the Introduction) and will therefore contract 'space' in its inner area proportional with its surrounding amount of matter. Exactly the same is thing happens in a large systems of clouds. The force of gravity therefore contribute to the low pressure that emerge. It's of course a weak force that we not are able to register on the level on each cloud, but on a huge scale it's a important factor.

If there are many clouds, and especially if the clouds are compact, big and heavy, this will cause the clouds (seen as a whole) to create a common, tangible SV (gravity centre), and contribute to contracts cloud systems together.