Clouds

Rare fallstreak hole cloud observed over Melbourne, Australia

A rare fallstreak hole cloud was observed today over Melbourne, Australia, Meteo Europe team reports. Because of their rarity and unusual appearance, as well as very little exposure in media, fallstreak holes are often mistaken for or attributed to unidentified flying objects. A fallstreak hole, also known as a hole punch cloud, punch hole cloud, skypunch, canal cloud or cloud hole, is a ...

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How do active volcanoes change clouds?

NASA Goddard Space Flight Center scientist Andrew Sayer talks about how emissions from volcanoes can affect clouds. This video provides an overview of research published in the Journal of Atmospheric Chemistry and Physics.  Research: Systematic satellite observations of the impact of aerosols from passive volcanic degassing on local cloud properties Journal of Atmospheric Chemistry and Physics, October 9, 2014 Link to paper: http://www.atmos-chem-phys.net/14/106… ...

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After Europe and Canada, noctilucent clouds expand to USA

The 2015 northern hemisphere noctilucent clouds season started on May 19, 2015 when NASA’s AIM spacecraft spotted a patch of electric blue clouds over the Artactic Circle. Since then, noctilucent clouds (NLCs) have been moving south and, on June 8 – 9, they reached the lower 48 US states, SpaceWeather reports.  “I caught sight of them around 3:45 a.m. local time,” ...

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Volcanoes cool the planet by releasing low-level sulfur to influence cloud formation

A new study, conducted by the University of Washington (UW) researchers used a huge volcanic eruption in Iceland, from the period between summer 2014 and early winter 2015, to explore how the sulfur emissions affects cloud’s brightness. The results suggest the clouds influenced by sulfur emissions from volcano eruptions indeed result in smaller cloud particles, reflecting significantly more sunlight and ...

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Nacreous clouds appear around the Arctic Circle

Sky watchers are observing an outbreak of polar stratospheric clouds or PSCs around the Arctic Circle, SpaceWeather reports. Unlike normal grey-white clouds, which hug Earth’s surface at altitudes of only 5 to 10 km (3.1 – 6.2 miles), PSCs float through the stratosphere (25 km/15.5 miles) and are fantastically colorful. Polar stratospheric clouds, also known as nacreous clouds (from nacre, or mother of pearl), are icy structures ...

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Expansion of tropics shifting high altitude clouds toward poles

NASA’s research team conducted a study on 30-years of satellite data to reveal that a recorded trend of high altitude clouds in the mid-latitude which are shifting toward the poles is primarily caused by the expansion of the tropics. One of the most important mediators of heat reaching our planet’s surface are the clouds. In their absence, the ocean or ...

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Cloud seeding flight suspected to aggravate major flooding in Tasmania

A cloud-seeding company Hydro Tasmania performed the seeding over the Derwent River watershed a day before the widespread flooding, caused by intense rainstorms, began on June 6, 2016. According to Premier Will Hodgman, the Energy Minister Matthew Groom is looking for an explanation as to why the seeding was authorized despite the heavy rainfalls already forecast. Cloud seeding is a ...

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Noctilucent clouds storm from July 12

You are not dreaming, you can see waves, shock fronts or waterfalls in the night sky! On the nights of the 12-13th and 13-14th of July 2016, Denmark has witnessed two very powerful and bright noctilucent cloud shows in a row. The brightest and broadest I can remember to date, writes photographer Adrien Mauduit, who made the amazing timelapse video below. ...

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40 tons of cosmic dust enters Earth’s atmosphere every day

New experiments, carried by the EU scientists, managed to estimate how much cosmic dust enters Earth’s atmosphere for the first time. The dust particles impact our atmosphere causing a wide range of phenomena, and further research hopes to address them. Dust particles, originating from comet’s orbiting the Sun, frequently enter Earth’s atmosphere where they collide with air molecules at speeds ...

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Record early start of southern hemisphere NLC season

The southern hemisphere noctilucent clouds (NLC) season has started early this year and tied with 2013 for the earliest southern hemisphere season on record. The 2016/17 southern hemisphere noctilucent clouds season started on November 17 and tied with 2013 for the earliest southern hemisphere NLC season in the CIPS data record, said Cora Randall, a member of the AIM science team at the ...

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