Smoothing and interpolation in LFM-II output

Joe Gerrity and Jack Newell found that by adding the so-called G-smoother on the output grid ([delta] = 190.5 km at 60N) they reduced the noise in a very noisy 500 mb vorticity field. In eyeballing the charts, with and without the final G-smoother, I estimate about 2/3 of the noise is removed. The G-smoother in one dimension can be broken down into three elements, v = ¹/₂,¹/₂, -1 . Here v is Shuman's (1957) smoothing index and is twice the weight applied to the outer two points of a 3-point smoothing operator. Frederick G. Shuman. "January 1978." "This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members." System requirements: Adobe Acrobat Reader. Includes bibliographical references (page 5). 1978 NWS (National Weather Service) Library Public Domain 1931