Case studies Imagery and case studies of weather phenomena and environmental events observed by EUMETSAT's fleet of weather satellites. Sort Refine results Categories Atmospheric composition Weather Data Meteosat Tags Terra/Aqua AVHRR MSG SEVIRI NOAA Europe MODIS Date 2011 Date January SHOW ALL Sort by Start Date Order Ascending Descending 1 result Case study 21 January 2011 00:00 UTC Pollution causes cloud-free gaps in clouds Elongated cloud-free gaps in stratus clouds caused by industrial air pollution.