Discussion
Which level typically separates convergence below from divergence above in a developing low?
Answer: A
In a typical developing system convergence occupies the lower troposphere and divergence the upper, with the change of sign at a level of non-divergence around 500 to 600 hectopascals. That level is where the barotropic vorticity equation is most nearly valid, which is why 500 hectopascals was chosen for the first numerical forecasts. The tropopause is well above the divergence maximum rather than at the transition. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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