Visibility & Cloud Base Thresholds

Selecting the ‘Visibility and Cloud Base display’ from the map display settings page presents the user with a colour coded overview of the latest observations from around the UK and at offshore locations. This mode evaluates only the reported visibility and the lowest significant cloud base (BKN/OVC) from the METAR against pre-defined threshold ranges and is updated following every new METAR.

The displayed colour status (Red/Amber/Green/White/Blue) is determined by the lowest reported parameter (either visibility or cloud base as applicable). This display is intended to support specific use cases, such as emergency services or instrument approaches, by providing an ‘at a glance’ indication of visibility and cloud base conditions that may impact operations. The pre-defined threshold ranges cannot be amended.

METARs older than 2 hours or otherwise unavailable will appear as grey, as they are incomplete METARs for which a visibility and cloud base indicator cannot be determined.