(Earth weather prediction by computer equation-solving and/or simulation)
Numerical weather prediction (NWP) is
the prediction of the weather (typically Earth's)
through the use of numerical methods to solve the relevant equations
and/or simulate the atmospheric dynamics.
Current weather prediction is now generally based upon such models,
scaled to cover a large portion of Earth atmosphere.
Such a computer model is termed a NWP model (for
numerical weather prediction model).
NWP's methods are borrowed by astrophysics, sometimes to the point
of adapting the same software to other solar system and
extra-solar planets.