Chapter 12 - Operational NWP.pdf

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Other considerations related to LAMs • The initialization is delayed for a few hours because it is necessary to wait for the global model to finish its forecast (LBCs).
Factors that control model execution speed • Must wait for most observations to arrive – model “cutoff” times can be 60-90 minutes. • For LAMs, must wait for the LBCs • The time step – requirement depends on numerical approach, and how conservatively the time step is chosen if there is a constraint. • The number of grid points • The speed of the processors, the number of processors, and how well the execution time scales with the number of processors. • The sophistications of the physics parameterizations • Make output available as the model is running. • Execution speed versus user friendliness • Large I/O loads can slow execution speed.
Page 1 and 2: Chapter 12 Operational NWP
Page 3 and 4: A simple operational modeling syste
Page 5 and 6: Model reliability - a distinction b
Page 7: • Transmission of observations ma
Page 11 and 12: Miscellaneous topics • Managing m

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