The model will be executable on parallel machines, facilitating very fast high resolution integration, and also be very portable between different machines, thus making it available to a large base of users. However their growth can far exceed the growth rates given by linear unstable modes. Forecast centres are also very concerned to know what sort of errors in their initial data could grow most rapidly. Here the aim is to examine the mechanisms for rapid growth in idealized models of the atmosphere. The peak kinetic energy growth rate increases as the vertical confinement increases and as the horizontal scale decreases, Fig. 2.
Red contours indicate northerly wind and blue contours indicate southerly wind.
The appropriate growth rate for the fastest growing normal mode is also shown. The maximum kinetic energy growth rate can for a transient period exceed that of the fastest growing normal mode without exploiting exaggerated vertical tilt. This can be understood in terms of potential vorticity unshielding. The initial distribution of q' is such that the associated flow is confined, Figs. As in Fig.