Meteosat   Meteosat image in channel 1, 21 December 1997 at 12:00 GMT. Channel 1 covers both the visible and the near infrared range of the spectrum.   Meteosat image in the thermal infrared channel, 21 December 1997 at 12:00 GMT.   Meteosat image in the water vapour channel (2), taken on 21 December 1997 at 12:00 GMT. The light grey tones indicate a high concentration of water vapour in the atmosphere.