The brightness of the full Moon was striking enough to distract Dan Khen (Member 65,792) from a firework display over the Puget Sound, north of Seattle, Washington State, US. ‘The light reflecting from the Moon was so intense,’ he told us,…

The breaking-wave cloud features known as fluctus form as a result of wind shear. When cloud develops at the boundary between a layer of cold air below and warmer air above, undulations can be lifted up and curled over by winds flowing muc…

‘Who reports the works and ways of the clouds, those wondrous creations coming into being every day like freshly upheaved mountains?’.

From John of the Mountains: The Unpublished Journals of John Muir (1938).