The METAR board is a time series display of weather conditions. There are two formats for the board: condensed and expanded. The coloring criteria uses the same impacts catalog as the TAF board which sets criteria for each airport.
The coloring criteria for the determined by the impacts catalog. The catalog lists criteria for the major airports based on winds, ceiling, visibility and weather. The impact is primarily aimed at weather conditions that could significantly impare commercial air traffic or even shut down the airport. The impacts criteria was not developed for general aviation.
Airport specific criteria take into account runway configuration and how impacts due to cross winds, runway visibility might impact traffic. There is a default criteria for all airports.
|Default Impact Criteria|
|Weather||--||--||-SN,VCTS||SN, +SN, *FRRA, *FRDZ, *IP, *TS, *TSRA|
|Ceiling (100 ft)||≥8||8>X≥5||5>X≥2||<2|
|Wind Speed (kt)||--||--||--||>30|
|Wind Gust (kt)||--||--||--||>35|
The condensed view lists any number of stations along the vertical axist and time along the horizontal axis (See Fig 1). Each box (last 12 hourly METAR observations) is color coded based on the level of the impact. White represents no impact, yellow slight impact, orange moderate impact and red high impact. The letters in the box represent the cause of the hazard. They are as follows:
There could be multiple hazards but only the top one from this list if shown. The board will pick the worst impact from either the prevailing or the temporary conditions. See hover for more data. The condensed view is the default if more than one station is specified.
The cutoffs for each color are shown in Fig. 2. The default criteria use the flight category cutoffs
When you hover over a cell, a popup of data specific to that time shows up (see Fig. 3). This will show weather, visibility, ceiling, and winds. Temporary conditions will be shown on the second line in . Any airport specific catalog criteria will be shown below the table.
For more detailed information for each site, click on the station identifier. This will go to the expanded view for each site. In this view, each weather condition is listed along the vertical axis (See Fig. 4). These are:
Since all the data are already viewable, unlike the condensed view, the hover popup will only show the airport specific impacts criteria for that time.
In addition, for airports with runway information, cross and head wind values may also be displayed (See rwywind URL option below and Fig. 6). These are available for each runway set for that airport. If an airport has three parallel runways, only one is shown. The runway is shown as RXX/XX with the primary and reciprocal headings. The wind data is computed based on actual runway direction relative to due north. No magnetic deviations are taken into account that this point.
The impacts catalog default wind criteria are used for color coding. A hover popup will show whether winds are head or tail, left to right or right to left.
Here is a list of the URL options: