One-Way Nesting Versus Two-Way Nesting: Does It Really Make a Difference?

Simulations performed using different nesting techniques have shown that this factor can led to rather different results when applied over a domain with complex orographic features. This differences were more evident on situations under low synoptic forcing. For the mesoscale-dominated case, differences obtained by choosing one or another nesting technique were more important than those produced by using a higher resolution topography, and two-way nesting gave worst results. For the synoptically-dominated case, the two nesting techniques gave more similar results and differences occurred mainly on the overlapping region of the domains. Predicted values at the different resolutions are not as similar as in the other scenario and in general gave higher speeds than observed, indicating that the synoptic component was overestimated by the model.