AWhat changed
Charney, Fjörtoft and von Neumann implement a limited-area barotropic-vorticity forecast on ENIAC, reporting four 24-hour experiments from observed 500-mb charts and analysing numerical, observational and model errors.
Scientific scope
Charney, Fjörtoft and von Neumann implement a limited-area barotropic-vorticity forecast on ENIAC, reporting four 24-hour experiments from observed 500-mb charts and analysing numerical, observational and model errors. The experiment uses a nondivergent, quasi-geostrophic barotropic model at a chosen atmospheric level. Boundary conditions, frozen linearization, differencing and observational inputs matter. The historical forecast cases and compute time are limited demonstrations, not held-out skill for a modern full-atmosphere model. Baroclinic dynamics and later numerical forecasting systems remain separate.
Evidence
Source-linked, scoped account of the original work. The published scope states the scientific assumptions and remaining verification limits. WRS has not independently certified the full proof, experimental result or system benchmark.
Contributors
- J. G. Charney · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
- R. Fjörtoft · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
- J. von Neumann · SCIENCE: Original source-listed scientific author of this scoped work; byline does not determine effort fractions.
Provisional WRS assessment, edition 2026-10-16.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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