What is VAPOR?
VAPOR stands for Visualization and Analysis Platform for Ocean, Atmosphere, and Solar Researchers. It is a software system providing an interactive 3D visualization environment that runs on most UNIX ,Windows and Mac systems equipped with modern 3D graphics cards. The home of the software is https://www.vapor.ucar.edu :
How to use VAPOR with Metview?
VAPOR has it own internal data model and NWP data has to be converted into the VAPOR format. There are a set of VAPOR command line tools that can convert NetCDF input data into this format but there is no such tool available for GRIB.
Metview's VAPOR Prepare icon helps to overcome this difficulty and allows converting ECMWF GRIB data into the VAPOR format.
Once the conversion has been completed the VAPOR Prepare icon cab be used to start up VAPOR with the newly created dataset. ECMWF GRIB can then be visualised in VAPOR data in various ways as the snapshots below illustrate it.
Further details
A tutorial demonstrating VAPOR usage with Metview is available here. The is about the visualisation itself. There is also a separate expal Mits is usage. The techinal details about the Metview