How cloud seeding makes it rain artificially

we talked about it sing about it and definitely complain about it the weather but have we come to the point where we can control the weather technically that's still too good to be true but the winds might be changing let's talk about cloud seeding it's described as the enhancement of natural precipitation to explain how cloud seeding works we need to first talk about clouds clouds are a bunch of water droplets or ice crystals floating in the sky the water droplets are too small to fall as precipitation but they are large enough to form the clouds we see in most parts of the world these droplets are supercooled meaning they're below freezing but they remain liquid now sometimes these droplets are just milling around pushing past each other and not sticking together kind of like a missed connection other times these droplets bump into each other like commuters on a train during a busy rush hour the water vapors collide and stick to particles floating in the air it could be dust smoke particles or even meteoric debris those are known as condensation nuclei so cloud seeding can produce what we want more or less of more snow more rain or smaller hail pellets this is done by introducing a seeding agent through pyrotechnic flares attached to an aircraft think Roman candles with a mission a mission to deliver those condensation nuclei that encourage more collisions and group Huddle's by ice crystals inside the cloud common seeding agents used on our dry ice the solid form of carbon dioxide silver iodide or simple salts like sodium chloride seeding agents act as additional ice nuclei in the case of silver iodide its structure is very similar to ice hexagonal which is why experts think ice wants to bond to it when silver iodide is used in a cloud water droplets begin to give up water vapor and shrink at the same time the ice crystals already present in the cloud collect this moisture and grow as ice crystals bang into other ice crystals they become larger and heavier until they fall from the cloud so why would we even want to do this who does it benefit in the winter time increase in snowfall and is you know a very significant value add to organizations like hydropower companies Idaho Power Company for example is interested in having more snowfall during the winter because this produces more runoff in the springtime for hydroelectricity wineries such as ones in Mendoza Argentina have also used cloud seeding to protect their vineyards from damage through hail suppression and lastly insurance companies like ones in Alberta fund cloud seeding projects in order to lessen damage claims they receive so how much does it cost well the cost can vary hail is the most expensive rain projects less expensive running two hundred thousand dollars to 1 million dollars a year and that might produce an extra 1.5 to 4.5 meters of snow in the mountains or an extra 50 to 125 millimetres of rain in the summer and you compare that to what is in the market price for water or comparable technologies and creating more surface and ground water that is desalinization groundwater recharge some of these are or even building dams and infrastructure or a fraction of that cost so now that we know how it works here are some myths busted why don't they cloud sea to extinguish forest fires because you can't create rain with cloud seeding you can only enhance clouds that are already present in cloud seeding result droughts not really because all precipitation requires clouds if it's already dry there won't be enough moisture to rise in the air no clouds no extra moisture no chance of enhancement however what can be done is to increase snow production and rainfall when there are clouds to work with in other words it needs to be pre-emptive but does it work in 2008 Beijing claimed that they made it rain early with cloud seeding to ensure blue skies with the Olympic opening ceremony in contrast the American Meteorological Society released a statement in 2010 saying there still uncertainty whether current cloud seeding techniques we work to achieve the desired changes in precipitation according to the World Meteorological Organization 52 countries have a weather modification program and many of them continue to boost funding for such operations all in an effort to perhaps one day control the weather thanks for watching global news if you enjoyed what you just saw please like the video also hit the subscribe button on the screen to make sure you get all the latest international news and best trending video

Channel: Global News

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Id: bU4z8ZiX_eA

Length: 4min 50sec (290 seconds)

Published: Fri Oct 12 2018