Discussion
Which historical model produced the first numerical weather forecast?
Answer: C
Charney, Fjortoft and von Neumann integrated the barotropic vorticity equation on the ENIAC in 1950, producing a twenty four hour forecast in about twenty four hours of computation. The single equation was chosen precisely because it filters gravity waves, which had wrecked Richardson's earlier attempt with the primitive equations. Multi-level primitive equation models came a decade later as computing power grew.
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