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Rare UFO-shaped 'hole-punch clouds' appear over Dorset

Daily Mail - Science & tech

Residents in Dorset were in for a surprise this week when they spotted what looked like a pair of UFOs in the sky. The rare atmospheric phenomenon is a strange cloud formation, known as hole-punch, or fallstreak clouds. Experts say that the bizarre shapes are caused by aircraft, and are often mistaken for alien craft by confused onlookers. Residents in Dorset were in for a surprise this week when they spotted what could easily be mistaken for a pair of UFOs in the sky. A fallstreak hole forms when part of the cloud layer forms ice crystals which are large enough to fall as a'fallstreak'.


Aerosol-driven droplet concentrations dominate coverage and water of oceanic low-level clouds

Science

The measured aerosol cloud–mediated cooling effect was much larger than the present estimates, especially via the effect of aerosols on the suppression of precipitation, which makes the clouds retain more water, persist longer, and have a larger fractional coverage. This goes against most previous observations and simulations, which reported that vertically integrated cloud water may even decrease with additional aerosols, especially in precipitating clouds. The major reason for this apparent discrepancy is because deeper clouds have more water and produce rainfall more easily, thus scavenging the aerosols more efficiently. The outcome is that clouds with fewer aerosols have more water, but it has nothing to do with aerosol effects on clouds. This fallacy is overcome when assessing the effects for clouds with a given fixed geometrical thickness.


Southern Californians react to unique cloud formation

Daily Mail - Science & tech

Southern California residents were treated to a far-out sight as a rare cloud formation made for a unique daytime sky on Saturday. The rare atmospheric phenomenon is a strange cloud formation of fallstreak, or hole-punch, clouds. Experts say the stunning clouds that look like brushstrokes or seashells - even apt for the coastal region - are caused by a rare but rather ordinary atmospheric occurrence. The rare atmospheric phenomenon that recently appeared in SoCal is a strange cloud formation, known as fallstreak, or hole-punch clouds. The view from Griffith Observatory shows the unique cloud formation over the Los Angeles Basin.


Strange cloud formation leaves a hole that looks like a UFO over Somerset

Daily Mail - Science & tech

Residents in Somerset were in for a surprise this morning, when they spotted what could easily be mistaken for a UFO in the sky. The rare atmospheric phenomenon is a strange cloud formation, known as fallstreak, or hole-punch clouds. Experts say the stunning clouds that look like a brushstrokes are caused by a rare - but rather ordinary - atmospheric occurrence. A fallstreak hole forms when part of the cloud layer forms ice crystals which are large enough to fall as a'fallstreak'. They form in clouds of supercooled water droplets - water below 0 C but not yet frozen.


'Like something out of Independence Day': Bizarre apocalyptic-looking clouds are spotted over Bournemouth

Daily Mail - Science & tech

A music producer thought he had woken up to an impending apocalypse when he filmed bizarre'holes' in the sky above his flat. Fortunately, the strange sight was really a type of cloud formation, known as fallstreak, or hole-punch clouds. Experts say the stunning clouds that look like a brushstrokes are caused by a rare - but rather ordinary - atmospheric occurrence. A music producer thought he had woken up to an impending apocalypse when he filmed bizarre'holes' in the sky above his flat. A fallstreak hole forms when part of the cloud layer forms ice crystals which are large enough to fall as a'fallstreak'.