Sighting Report: Observation of a Cloud Bank and Light Phenomenon

This document is a handwritten account of an atmospheric observation made by the author between 19.00 and 19.30. The author, having returned from a boat trip on Stora Värtan near Rydboholm, observed a cloud bank to the southwest. The author notes that the cloud bank appeared similar to a light phenomenon at sea but was significantly more diffuse and powerful. The bank was estimated to be between 1500 and 2000 meters thick. It was observed to be completely opaque from the ground upwards, a fact the author believes was confirmed as it gradually obscured the setting sun, which appeared pale yellow rather than red. The author compares the light phenomenon to fireworks observed at a distance of approximately 300 meters, noting that the fireworks had a height of about 100 meters and appeared diffuse, though less so than the observed phenomenon. The author concludes by comparing the level of diffusion of the observed phenomenon to the clouds themselves, silhouetted against the bright evening sky to the north-northwest.