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A visible image taken from the geostationary satellite Meteosat SEVIRI (placed over the Greenwich Meridian, longitude 0°) at 1200 UTC on 2 May 2008. The outlines of countries are overlaid and there is also a grid of reference marks (+). This image is illuminated by sunlight and the brightness indicates the amount of light that has been scattered back to the satellite; clouds appear white and the oceans (where cloud-free) appear darker than the land. Strong convective cloud activity can be seen in equatorial regions, whereas at mid- and high latitudes clouds indicate the presence of large high- and low-pressure systems and frontal structures; a good example is a weather system over the South Atlantic.