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Sections 0, 1 and 5 contain static metadata, mostly for message identification. Section 2 is optional; if used, it may contain arbitrary data in any form wished for by the creator of the message (this is only advisable for local use). Section 3 contains a sequence of so-called descriptors that define the form and contents of the BUFR data product.
This is a code number from 0 to 4, with 0, 1 and 2 meaning data is included, and 3 and 4 indicating no precipitation data. i X is a code number indicating the manner of station operation, and the format used in group 7wwWW ; codes 1, 2 and 3 indicate a staffed station, while codes 4 to 7 indicate an automatic station.
In the US and parts of Europe the lowest significant cloud layer is five or more oktas; in the United Kingdom, Belgium, France and the Netherlands it is three oktas or more. [3] If visibility or cloud height measurements fall on a boundary (e.g. 5000 m visibility or 1500 ft cloud height) the colour state assumes the higher value in this case WHT.
In the United States, the wind direction must have a 60° or greater variance for variable wind direction to be reported and the wind speed must be greater than 3 knots (5.6 km/h; 3.5 mph). 1/2SM indicates the prevailing visibility is 1 ⁄ 2 mi (800 m) SM = statute mile .
A TTF is a professionally considered forecast for weather over a two-hour period, [1] and is based on an actual weather report, such as a METAR or SPECI and appended to the end of it. [1] A TTF is similar to or sometimes in addition to a TAF, a terminal aerodrome forecast, but during the TTF's validity period is considered superior to a TAF.
IWXXM Version 3 was first made available as version 3.0RC1 in July 2018. Major changes include restructuring and simplifying with the removal of Observations and Measurements model (O&M), addition of the new Space Weather Advisory and other changes with regard to Amendment 78 to ICAO Annex 3, and numerous fixes and enhancements.
MrSID (pronounced Mister Sid) is an acronym that stands for multiresolution seamless image database.It is a file format (filename extension.sid) developed and patented [2] [3] by LizardTech (in October 2018 absorbed into Extensis) [4] for encoding of georeferenced raster graphics, such as orthophotos.
The station model uses a wind barb to show both wind direction and speed. The wind barb shows the speed using "flags" on the end. Each half of a flag depicts 5 kn (9.3 km/h; 5.8 mph)