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What happens when d01 is less than 100x100?

Best Practice
Domains should not be smaller than 100x100 grid spaces. Note that there will be about 10 grid points (minimum of 5) on each side, in the boundary zone. If domains are too small, the solution will be determined by forcing data, which defeats the purpose of running a simulation.

When considering the size of the coarse domain, there is no need to be economical. Doubling the size of the coarse grid domain will only result in a 25% nested forecast time increase. It is also important to consider the speed at which systems are moving through the simulated region. A multi-day forecast needs a much larger domain than a short forecast. If cost is prohibitive, consider adding an external domain.