On 07.08.2019 a cold front crossed the south of Germany at noon. Within the compact, closed clouds of this front there was a linear development of precipitation.
On the afternoon of November 15, 1818, a jet holdings flies over southern Germany. Between Ulm and Memmingen the plane leaves its contrails at high altitude. They are cast as shadows in the high fog / fog of the Danube valley and the Alpine foothills.