You have still not explained, how you justify the assumption that atmosphere is isothermal horizontally, but allows for horizontal pressure gradients. (judithcurry.com)
You can get horizontal pressure gradients from uneven distributions of molecular nitrogen (N2) ice, and you can get horizontal temperature gradients from uneven heating from the sun. (space.com)
4 in the post) is that all potential energy released from condensation is locally converted into the power of the large - scale horizontal pressure gradient force u ∇ p. (judithcurry.com)