Wonderful mammatus cloud spotted in Santo Domingo de Silos 22 May 2017 on Clouds, Mammatus cloud, Photography, Spain, Santo Domingo de Silos Another wonderful photo arrived to our inbox on Facebook. Windy user Jan Ciglbauer sent us this picture of mammatus cloud he spotted in Santo Domingo de Silos, Spain, on 5 May 2017 in the morning. Wonderful mammatus cloud spotted by Windy user Jan Ciglbauer https://t.co/KTZLOWAlNP @StormHour @AMHQ @wunderground @photoweather1 pic.twitter.com/5Fh2GgthZK— Windy (@windyforecast) May 22, 2017 Thank you, Jan! Photographer? Send your photos to firstname.lastname@example.org to get featured.