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Digital filters for use in post-processing forecast fields
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    "The growth of noise, that is high wave number variability, in the course of the numerical integration of limited-area forecasts has been discussed in previous papers [1,2]. As long as the integration is computationally stable, the noise is not overly significant except when it detracts from the appearance of the post-processed charts. To avoid confusion in the interpretation of such charts, it is desirable to suppress the noise components while leaving the meteorological components relatively unaltered. In principle, one may utilize Fourier analysis to accomplish the desired smoothing. More efficient methods exist for accomplishing the desired end to a reasonable degree of accuracy. Shuman [3] and, more recently, Shapiro [4] have discussed the construction of cascaded linear digital filters to meet prescribed specifications. The approach used in our filter design differs somewhat from theirs and documentation seems warranted"--Introduction.

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