20010628: question bout the MRF

>From: "J. Correia" <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200106281403.f5SE3s129013

>i just noticed that there are two 500 hPa height grids...one named hght
>and the other named hght5...what exactly is the hght5 grid? thanks for the
>help!
>james correia jr
>
>

James,

HGHT5 is the 5 wave geopotential height, eg it uses the first 5 (largest)
spectral wave numbers. HGHT is the geopotential height using all wave 
components of the spectral model. Since HGHT includes many more
(T62, T126 and T170 models) wave numbers, it will include more high frequency
noise. HGHT5 will be much smoother and not contain the short wave
contributions.

Steve Chiswell
Unidata User Support