It's a map describing a meteorological situation for aeronautics. It is distributed every 3 hours.

Features of a typical map are the hour of validity (1), the center of pressure (H) for anticyclone and (L)  for depression (2), the position of fronts (3), the limit of significant time (4), phenomena with particular symbol (5) (chart for examples), the turbulence (6), the level of the isotherm zero (7), temperature and level of the tropopause (8).

CAT: Clear Air Turbulence
: Drizzle	: Moderate icing
: Freezing frog	: Moderate turbulence
: Freezing rain	: Rain
: Hail	: Shower