SADIS delivers WAFS products in digital, chart and alphanumeric formats, as well as other character-orientated OPMET information required for pre-flight planning and flight documentation. The SADIS second-generation (SADIS 2G) service can be configured to present data to a client end system using either TCP/IP protocol, UDP multicast, or X.25 PVCs. The X.25 configuration is has the same functions as the data presentation from a SADIS first-generation (SADIS 1G) receiver.
GRIB 1 (WAFS) (10 MB four times a day) consisting of wind, temperature and humidity forecasts for standard levels; forecast height of tropopause, and maximum wind for T+6 to T+36, using a gridded binary code (WMO FM 92-IX Ext - GRIB). The forecast is issued four times a day based on the main runs of the Met Office Global Model, and available at around 0335 UTC/0935 UTC/1535 UTC/2135 UTC.
OPMET (10 MB a day) includes METARs, TAFs, SIGMETs, SPECIs, special AIREPs, ADMIN messages, European region AIRMET and GAMET, ASHTAM and NOTAM related to volcanic ash and tropical cyclone advisories.
Portable Network Graphics (PNG) SIGWX charts (4 MB a day) for the standard ICAO areas as specified in ANPs, produced by WAFC London and WAFC Washington. High- and medium-level BUFR formatted SIGWX data (approximately 2 MB per day) covering the same areas. Volcanic Ash Dispersion advisories in graphical format, when available, will be issued on this channel.
Please note: volumes are approximate.
SADIS 2G configured for UDP results in all three data streams being multicast to a single IP address on the LAN. The three data streams all share the same UDP port number, and can be distinguished at the workstation by a 6-byte header.