Meteorology / Convert to ARL / GFS Forecast

This menu tab is intended to convert existing GFS GRIB forecast files to the ARL packed HYSPLIT compatible format. A similar program is used to convert GRIB data in the FTP menu tab. However, more options are available through this menu.

The base GRIB file is set by selecting one of the GRIB files in the "Set file name" menu tab. Subsequent forecast file names will be constructed automatically following the NCEP convention which assumes the GFS file names end with pgrbf{HH}.tm00, where HH is the forecast hour. GRIB conversions are only valid for data on the one-degree global latitude-longitude grid (pgrb base name).

Four different grid conversions are available through the menu. "Extract" is identical to option available through the FTP menu, such that the GRIB data are interpolated to a conformal map projection of 100x100 grid points at 100 km resolution at the center of the latitude and longitude selection of the slider bar. The Northern- or Southern Hemisphere options create a 95-km resolution polar stereo-graphic grid centered about the pole. The global check-button does no conformal interpolation, but just converts the original one-degree latitude-longitude data to the ARL packed format.



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