2022年8月11日 · The rarest cloud formation is Nacreous clouds, also known as Polar stratospheric clouds. Nacreous clouds form best when the Sun is several degrees below the horizon, at sunset and sunrise. The Sun illuminates the thin disc clouds from below, giving them bright and iridescent colors.

2021年8月9日 · Wispy cirrus clouds or cartoonishly fluffy cumulus clouds can be cool enough on their own. But occasionally, you’ll witness a formation that looks eerily like a UFO, a breaking ocean wave, or a...

2023年6月5日 · Called noctilucent clouds (meaning "night-shining" clouds in Latin) or NLCs, these strange-looking patterns in the sky are the highest, driest, coldest and rarest clouds on Earth, according...

2024年1月31日 · Here’s a quick guide to some of the most eye-catching and bizarre cloud formations out there, how they form, and what they might mean. Anvil clouds are a subtype of cumulonimbus clouds that form a flat, anvil-shaped top. These are powerful thunderstorm clouds that can form dangerous supercell storms.

2012年6月22日 · These "mammatus clouds" were photographed in the city of Regina, Saskatchewan, in June 2012, following a severe storm warning and tornado watch.

2007年10月10日 · These rare clouds, sometimes called mother-of-pearl clouds, are 15 – 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds. They have iridescent colours but are higher and much rarer than ordinary iridescent clouds.

2025年3月26日 · Here’s a list of some of the most common cloud types you might spot in the sky: Cirrus clouds are delicate, feathery clouds that are made mostly of ice crystals. Their wispy shape comes from wind currents which twist and spread the ice crystals into strands. Weather prediction: A change is on its way!

2009年9月29日 · Known as mammatus clouds, these strange, pouchy formations often occur in association with a thunderstorm. They have been seen in lots of places, including the midwestern United States. "They are...

2023年9月19日 · What Are Clouds?: Clouds form when moist air rises, cools, and condenses around particles called cloud condensation nuclei (CCN), which can be dust, pollen, or even pollution. Cloud Types: There are 9 cloud types with a …

2013年6月3日 · Luckily, you don’t need to be a meteorologist or a science fan to appreciate the beauty of a cloudy sky. Here’s a selection of some stunning cloud photos – we bet that among them you’ll find some weir cloud formations that you’ve never actually seen before!