Since the Nyquist velocity can change during a volume scan, care is taken during the averaging process to insure that all data contributing to the average lie within the same Nyquist interval. That way, the average Nyquist value can be used to do the unfolding in the analysis quality control procedure. Data are rejected if, after unfolding, they differ from the background data by a user-specified threshold. Bias in westerlies simulation. Distance labels in km.
Simulated radar is at center of plot.
Although the radial winds are converted to u and v wind component corrections parallel to the radial at each point, the resultant analysis of these observations is not at all constrained in this way. By combining the information from several locations, the local transverse wind component can be modified in the analysis. To demonstrate this effect, a background field of westerly winds is specified, with a magnitude of 8 ms -1 . Then, radial wind observations are simulated as if the actual wind were west at 10 ms -1 . As one might expect, the method is most successful in depicting the true wind to the east and west of the radar.