Discussion
Which historical reason explains the choice of 500 hectopascals for the first forecast model?
Answer: B
The barotropic model assumes non-divergent flow, so it is most nearly valid at the level where the divergence actually vanishes, and 500 hectopascals is close to that level. It is also the level with half the atmospheric mass beneath it, which reinforces the choice. The strongest winds are near 250 hectopascals, and observational convenience did not drive the decision.
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