Air motion maps can be combined with sea level pressure, wind animation and the graticule by activating the different options in the lower right corner, with one click.
These maps show the relative vorticity at a specific pressure level (e.g. 500 hPa) with colours as specified in the legend. Combining the vorticity maps with line plots such as streamlines will give you more information about circulation patterns in the atmosphere, for example. More: see vorticity .
CAPE stands for Convective Available Potential Energy. It is a measurement of the amount of energy available to a buoyant parcel of air during the process of convection. CAPE is measured in joules per kilogram (J/kg). The higher the amount the more productive is the atmosphere to severe weather i.e. the higher the figure the more unstable is the atmosphere. The Lifted Index is displayed additionally in the map as lines with the corresponding value.
More: see CAPE .
These maps show the dimensionless lifted index (LI). It is visualised with colours as specified in the colour bar.
More: see lifted index .
Convective inhibition (CIN)
These maps show the convective inhibition (CIN) with colours as indicated in the legend. CIN is expressed in joules per kilogram (J/Kg). More: see convective inhibition .
These maps show the relative helicity in the indicated atmospheric layer (0-3 km) with colours in m²/s². Helicity is simply a measure of the amount of rotation found in a storm's updraft air. If there is significant rotation in a storm's updraft air, the storm will become more than likely a supercell and possibly spawn one or more tornadoes.
More: see helicity .
Clear air turbulence (CAT)
These maps show the expected intensity of clear air turbulence (CAT) with colours as indicated in the map legend.
Visualizing the invisible clear air turbulence on weather maps is very helpful to be prepared for regions where heavy turbulences could appear. It allows to plan a calmer flight path by avoiding regions with severe CAT.
More: see clear air turbulence .
These maps show the convective updraft, which is expressed in metres per second (m/s). It is visualised with colours as specified in the legend.
More: see convective updraft .