In the northern hemisphere, night-shining clouds seem to be forming earlier and spreading farther each year, as they did in 2013.
Published Jun 25, 2013
In recent years, scientists have turned their attention to the ways in which human-produced aerosol pollution modifies clouds.
Published May 14, 2002
They may look like airplane contrails, but the streaky clouds shown in this photo-like image formed around the exhaust left in the wake of ships traveling along the northwest coast of North America.
Published Jan 26, 2008
Hole-punch and canal clouds form when aircraft pass through altocumulus clouds that are rich with supercooled water droplets.
Published Dec 20, 2014
The corridor between the United States and Mexico is a fairly busy one for air traffic—heavy enough to produce plenty of contrails, but not so much that they all blend together.
Published May 14, 2019
The rare night-shining clouds seen in this photo are both forming more frequently and becoming brighter, trends that point to changes in the atmosphere linked to greenhouse gases.
Published Jan 27, 2011
High-altitude clouds appeared as far south as the continental United States in early June 2015.
Published Jun 19, 2015
