The NAM model is a regional mesoscale model using
enhanced terrain and improved parameterization of
surface and precipitation processes. It produces
forecasts out to 84 hours at 00, 06, 12 and 18UTC.
The Nested Grid model (NGM) - Its name comes from
the technique of using a finer grid over North
America and coarser grid over the oceans.
The NGM provides guidance out to 48 hours at 00 and
12UTC.
The Global Forecast System (GFS) - The GFS is a
global spectral model used primarily for aviation
weather forecasts.
The GFS provides guidance out to 384 hours at 00,
06, 12 and 18UTC.
