DDS is the Domestic Data Service, one of the NWS Family of Services. The data in this feed cover the US, Canada, and Mexico. The products are ASCII text files.
The DDS products include surface reports, upper-air data, radar, PIBAL's, pilot reports, SIGMET's, buoy reports, oceanographic data, city forecasts, and FOUS guidance. Many of these reports are coded.
PPS is the Public Products Service, one of the NWS Family of Services. The data in this feed cover the US, Canada, and Mexico. The products are ASCII text files.
The PPS products include watches and warnings, hydrology, agricultural forecasts, air quality indices, earthquakes, national weather summaries, recreation reports, record reports, road conditions, and extended forecasts. Most of these reports are presented in plain English.
One of the NWS Family of Services (FOS) data streams, IDS is primarily comprised of text bulletins containing weather information or observations from outside of the United States.