What is the NDGD?
National Digital Guidance Database (NDGD) is a sister to the National Digital
Forecast Database (NDFD). Information
in NDGD may be used by NWS forecasters as guidance in preparing official
NWS forecasts in NDFD.
The experimental/guidance NDGD data is not an official NWS forecast product.
NDGD contains forecasts and observations of sensible weather elements that
relate to and supplement NDFD. It will also contain digital data that
help in the use and interpretation of NDFD, such as model probabilities,
climatological normals, and NDFD verification scores.
NDFD is always current. It is intended to provide a complete
and consistent forecast in time and space, among elements, and with other
official NWS forecast products. In contrast, NDGD is updated
on a schedule from a variety of model sources. It is not necessarily
consistent with other parts of NDGD nor with official NWS forecast products. Access
to the data and a description of NDGD elements can be found here.
Images of grids for many NDGD elements can be viewed on the web.