|24 hour forecast package valid at 00Z||08Z|
|24 hour forecast package valid at 06Z||14Z|
|24 hour forecast package valid at 12Z||20Z|
|24 hour forecast package valid at 18Z||02Z|
High level SIGWX charts are valid at specific fixed times: 0000, 0600, 1200, and 1800 UTC. They show significant en-route weather phenomena over a range of flight levels from 250 to 630, and associated surface weather features. The significant weather elements are defined by WMO and ICAO, and include:
NOTE: Jet Depth: The vertical depths to the 80 knot wind field above and below the jet steam using flight levels. Jet stream vertical depth forecasts are included when the maximum speed is 120 knots or more.
This document has been prepared by the World Area Forecast Centres (WAFCs) for the purpose of providing guidance to software developers who have the task of constructing WAFS SIGWX BUFR visualisation software. The document is designed to assist developers in the construction of compliant visualisation software that receives its data input from text files obtained from BUFR decoding software.