normal mode initialization

From Glossary of Meteorology
A method that uses model normal modes to adjust the initial conditions of an NWP model so that high-frequency oscillations are removed from the subsequent forecast.

The most successful procedure is known as nonlinear normal mode initialization, in which the normal modes are used to filter out high frequencies from the time derivative of the initial conditions.
Daley, R. 1991. Atmospheric Data Analysis. 263–321.

  1. In synoptic meteorology, a detailed study of the state of the atmosphere based on observations, usually including a separation of the entity into its component patterns and involving the drawing of families of isopleths for various elements.
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