This is about four times higher than the highest clouds we normally see, the wispy cirrus clouds. Because the air is so thin in this part of the atmosphere, it needs to be much colder than 32°F ...

The Blue Angels put on a show to remember, thundering across the sky over downtown Louisville in tight formations. The weather saw temperatures in the upper 70's with scattered clouds providing ...

Blue ‘noctilucent’ clouds are appearing further south than ever seen before – and pollution may be a cause Published: July 3, 2019 7:00am EDT. Jon Perrett, University of Bath.

Not every cloud can make thunder and lightning. Thunderclouds are very tall – of course, from the earth you can’t always tell how tall the cloud is because you just see the bottom.

The clouds, known as “noctilucent clouds” or NLCs, glow blue at night because tiny ice crystals 50 miles (80 km) above the earth are reflecting sunlight from the other side of the planet ...