prognostic equation


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prognostic equation

[präg′näs·tik i′kwā·zhən]
(meteorology)
Any equation governing a system which contains a time derivative of a quantity and therefore can be used to determine the value of that quantity at a later time when the other terms in the equation are known (for example, the vorticity equation).
References in periodicals archive ?
The vertical diffusion is parameterised using a prognostic equation for the turbulent kinetic energy (TKE) and a diagnosed mixing length, according to Estournel and Guedalia (1987) for stable conditions and to Bougeault and Lacarriere (1989) for unstable stratification.
The physical package includes a tiled surface scheme, a turbulence parameterisation based on the TKE prognostic equation, a radiation scheme, a parameterisation of moist processes including large-scale and convective condensation and a parameterisation of visibility based on the LWC.
FDDA, based on Newtonian relaxation or "nudging", adds artificial (non-physical) forcing functions to the WRF model's prognostic equations to nudge the solutions toward either a verifying analysis or toward observations.