Thin ice clouds are shown as a white and pale grey pattern towards the top of the images, which illustrates radiation temperatures. Condensation trails are also visible here – white stripes indicate thick but still-young contrails. Older contrails overlap with one another and other clouds and are no longer visible as streaks. The upper image shows radiation temperature differences from the 10.8 and 12 micrometre channels of the Meteosat Second Generation (MSG) weather satellite, using the SEVIRI sensor, at 10:00 UTC on 16 April 2020. The lower image shows a false colour composite image of visible and infrared measurement data from the MSG/SEVIRI instrument for the same meteorological conditions.