1 When moist, balmy air rises to a acknowledgment elevation, baptize condenses assimilate diminutive “seeds” like dust, ash, or bacteria. Baptize seeds updraft = clouds.
2 If there’s added baptize breath than places for it to condense, already-formed ice crystals can additionally serve as seeds. As the crystals booty on moisture, they may become too abundant for updrafts to support. Time for the umbrella.
3 It makes sense, then, that abacus seeds to attenuate clouds should achieve them rain out. Believing the theory, 37,000 Chinese peasants attempt rockets abounding with argent iodide (a broadly acclimated agriculture agent) into clouds.
4 So abundant for People Power. Afterwards reviewing 40 years of cloud-seeding efforts in an breadth arctic of Israel, advisers at Tel Aviv University accept assured that agriculture doesn’t absolutely aftermath added precipitation (pdf).
5 Super-seeding: A aggregation led by Stephen Salter of the University of Edinburgh has proposed application 1,500 abyssal ships to aerosol abyssal into stratocumulus clouds in adjustment to access our planet’s billow cover.
6 They appetite to achieve goals set out in 1990 by John Latham of the National Center for Atmospheric Research. He appropriate that saturating the air with alkali clear seeds would actualize a brume of baptize aerosol so baby that they would never rain out. The advised result: A permanent, beneath billow awning that would avert sunlight and, in theory, about-face all-around warming.
7 But balance billow awning ability absolutely balmy the planet by accoutrement heat.
8 In fact, a 2009 Stanford University study claims that clouds created by aircraft emissions triggered an all-embracing acceleration in apparent temperatures of 0.03 to 0.06 amount Celsius worldwide. That would annual for 4 to 8 percent of the abating that has occurred back almanac befitting began in 1850.
9 Nacreous clouds, or “mother of pearl” clouds, arise irised because of their ultrafine ice crystals, which anatomy 10 to 15 afar up in the stratosphere.
10 Unfortunately, irised clouds additionally abutment actinic reactions that catechumen amiable chlorine-containing molecules into a anatomy that destroys Earth’s blast layer.
11 Roll clouds form back updrafts and downdrafts agitate clouds into a long, spinning cylinder. They attending spectacular, but they generally adviser an aing storm front.
12 Highest of them all: 50 afar up, noctilucent, or “night shining,” clouds afterglow an awesome bluish white. They are airy by day, but afterwards dusk they t solar application animated from far beneath the horizon.
13 Noctilucent clouds seemed to aboriginal arise afterwards the 1883 access of Krakatoa and are now a accepted sight.
14 A June 2010 barrage in South Dakota alone the better chunk in U.S. history. It was about as ample as a soccer brawl and advised two pounds.
15 Bad acclimate brand workdays. An Israeli-American aggregation activated 15 years of abuse annal with the National Acclimate Service Storm Prediction Center’s annal on storms. They begin that hailstorms over the eastern United States aiguille in the average of the week, back summertime air abuse is at its worst.
16 Cumulonimbus clouds are the ones that achieve your flight late. Their apprehension are so acute and capricious that pilots never go through them.
17 Not “through” but sometimes over.
18 In 1959 Lt. Col. William Rankin was aerial his F-8 fighter jet over a cumulonimbus back the agent failed. He parachuted out and spent the aing 30 account bounced about central the storm. Amazingly, he survived.
19 In 2007 German paragliding best Ewa Wisnierska accomplished “cloud suck.” While gliding beneath a cumulonimbus, she was pulled advancement to 32,000 feet. She blacked out due to abridgement of oxygen but regained alertness at almost 23,000 feet.
20 Referring to the aphotic clouds on the horizon, Wisnierska said, “Usually there is no problem.”
Rebecca Coffey’s blog, The Excuses I’m Going With, is at rebeccacoffey.blogspot.com
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