Sea level pressure
These maps show the air pressure (at sea level) in hPa, shown with isobars and colours as indicated in the map legend. More: see pressure.
These maps show coloured areas of equal altitudes for a specific pressure (e.g. 500 hPa). The geopotential height is expressed in geopotential decametres (gpdm). Combinations with other maps are possible: For instance, isohypses may show the mean sea level pressure (hPa), whereas large scale airflow currents will be visible by adding streamlines for the specific altitude. More: see pressure .
These maps show the thickness of a specific air layer in geopotential decametres (gpdm) with the help of colours according to the thickness. For instance, the thickness of the air layer between the 1000 and 500 hPa pressure level can be shown. Further, the mean sea level pressure may be visualized with isobars as well. More: see pressure .