The National Digital Forecast Database (NDFD) is a real-time national mosaic of gridded sensible weather forecasts generated locally at WFOs. Every 30 minutes, an updated NDFD mosaic is issued containing the most recent WFO forecast grids. The regions for which updates are provided include the coterminous U.S. (CONUS), Puerto Rico/the Virgin Islands, Hawaii, Guam, and/or 16 pre-defined CONUS subsectors. NDFD gridded forecast mosaics are intended to serve a broad spectrum of public and private users.

The Verification Team of the Digital Forecast Services Division develops and maintains systems to collect and assess the quality of a variety of NWS public and aviation forecasts, including forecasts from the National Digital Forecast Database. We provide NWS management and the public with information about the skill and accuracy of various forecast products. New techniques for verifying forecasts and displaying results are investigated. Specialized studies are conducted as needed to support service assessments carried out by other NWS organizations