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The Growing Industry of Cloud Seeding

There is an unobtrusive industry growing in controversy that has powerful potential for environmental health and public well being world wide. This is the industry of cloud seeding—making it rain where it normally does not or at a time when it normally would not. Although humans have been affecting weather patterns for millenia with the way we've cut down forests and with uncontrolled growth of cities, this is the first time we know of that an actual industry has developed to change the weather directly.

Cloud seeding is widespread and growing, with some 150 ongoing projects counted worldwide in 2012 (according to the government of Australia). Unregulated, the industry could be inadvertently (or deliberately) destructive, but some dangers have already been experienced, and government and international agencies are watching carefully. Some restrictive legislation has already been passed. There are cases in US courts that will help define limits further. Careful testing on public health is already being carried out. It remains to be seen what more will be needed as this emerging industry grows.

The flare at the end of the wing is releasing silver iodide into the clouds to create rain.

The flare at the end of the wing is releasing silver iodide into the clouds to create rain.

What Is Cloud Seeding?

Cloud seeding is the process of throwing a specific chemical or biological agent into an already existing cloud mass that causes the cloud to thicken and/or water vapor to condense and fall as rain or snow. They can be thrown from the ground or the air, and are currently being used to:

  • Increase rainfall where it doesn't rain much.
  • Clean or cool the air for outdoor events.
  • Clear airports of fog.
  • Add snowpack for skiing or water supply.
  • Prevent hailstorms or reduce hurricanes by inducing rain early on.
  • Reduce heat from the sun by increasing cloud mass.

Government bodies, utilities, and private companies all use cloud seeding for projects such as these. Agents commonly used are sodium iodide (underneath a cloud), dry ice (above a cloud), sea salt (in warmer climates), liquid propane (to reduce fog), and desiccated ice-nucleating bacteria––Pseudomonas syringae.

Results vary. According to a recent article in the Denver Post, cloud seeding results in a 0-25% increase in precipitation, depending on cloud cover and how the seeding is carried out.

Molecular Matrix - Ice. Look beyond the dark blue background and notice the similarity of the ice matrix with the one below.

Molecular Matrix - Ice. Look beyond the dark blue background and notice the similarity of the ice matrix with the one below.

Molecular Matrix - Silver Iodide. Its similar hexagonal shape gives this compound a similar ability to precipitate water vapor.

Molecular Matrix - Silver Iodide. Its similar hexagonal shape gives this compound a similar ability to precipitate water vapor.

Cloud Seeding Experiments

In 1946, researchers connected with the General Electric Research Laboratory in New York discovered the possibility for using both dry ice and silver iodide to trigger precipitation. In November of that year they tested both in real time, causing snow to fall near Mount Greylock in Western Massachusetts.

In the 1960s, the United States Bureau of Reclamation and the National Oceanic & Atmospheric Administration (NOAA) agencies started supporting the development of further research. California was one of the country's early experimenters, starting in 1948, according to Wikipedia.

Later in that decade, the U.S. military used rain creation technology to gain an advantage over their enemies––flooding supply routes in Vietnam. Weather manipulation for purposes of warfare was quickly banned by international treaty.

Although the military still experiments, it is heavily restricted to weather measurement and enhancement projects only. The U.S. Bureau of Reclamation carried out experiments in the U.S. and also in Thailand and Morocco until government funding declined in 2006.

Nearly 150 countries have experimented with, and many are using, cloud seeding techniques on a regular basis: Australia, Austria, Canada, China (the world's heaviest user), England, France, India, Jordan, Mali, Mexico, Niger, Russia, South Africa, Spain, the United Arab Emirates, the United States, are among them. China spends over $90 million per year in cloud seeding projects, while the US spends $15 million and growing. Other than the international ban against warfare use, all regulation of the industry is local.

Using Cloud Seeding for Hail Suppression

Hailstone - If left to its own, hailstorms don't precipitate until the temperature is freezing cold, creating large hailstones like this that destroy crops.

Hailstone - If left to its own, hailstorms don't precipitate until the temperature is freezing cold, creating large hailstones like this that destroy crops.

Ice Pellets - Dry ice forces an impending hailstorm to precipitate as tiny ice pellets, instead of waiting until the ice clumps together to drop as hailstones.

Ice Pellets - Dry ice forces an impending hailstorm to precipitate as tiny ice pellets, instead of waiting until the ice clumps together to drop as hailstones.

Companies That Seed Clouds

To give you an idea of what cloud seeding projects look like, here are some of the 14 U.S. companies that reported projects in 2011. These projects were registered with the National Oceanic & Atmospheric Administration (NOAA), which does weather tracking for the United States.

  • Franklin Soil & Water Conservation District - In the winter months of 2007 and 2011 this government entity seeded an area in Idaho, USA covering 184,000 square miles to encourage precipitation the following August.
  • North American Weather Consultants - In 2011 this company reported a total use of 96,047 grams of silver iodide to seed eight projects for local government agencies in Utah, Colorado, Idaho, and California. The projects lasted an average of 19 days each and covered a total area of 22,075 square miles. All projects but one were to increase snowfall. That one, in Santa Barbara County, CA was to increase winter rain. NAWC has over 60 years of experience in five continents worldwide.
  • Western Weather Consultants - This company carried out five projects in 2011, seeding a total of 10,000 acres in Colorado, all to increase snowfall. Two of those projects were for the Vail and Telluaride ski resorts, the other three to enhance water supply for the SW Water Conservation District (2) and the Denver Water Department.
  • Weather Modification - This North Dakota company flies 35 planes that execute atmospheric research projects in 19 countries, including the U.S. In 2011 their six U.S. cloud seeding projects covered a distance of 13,495 square miles in Wyoming, California, and North Dakota. The company charges from $500,000 to $20 million for a cloud seeding operation.
  • Western Kansas Groundwater - This public company seeded a 6,766 square mile area in Kansas during the months of Apr-Sep, 2011 to prevent hailstorms and enhance groundwater supplies. It's an annual program that has gone on for almost 40 years in a particularly dry part of Kansas, and has been filled with controversy about its efficacy. The company used dry ice for the first several years as its seeding agent, then switched to silver iodide, and now uses both. Recently the state of Kansas cut its supplemental funding in half, at the same time that the cost of silver iodide increased dramatically, necessitating a decrease in services provided.

Cloud Seeding in Texas

Texas has been cloud seeding for more than 50 years. In the video the announcer states that the silver iodide used in cloud seeding has been proven safe, which is not exactly true. There is no strong evidence that it causes harm yet, but testing continues. Meanwhile, there is speculation that cloud seeding exacerbates droughts by removing the "seed moisture" needed for the next batch (like making sourdough bread or kombucha tea).

Cloud Seeding Projects

Looking from a project point of view, here are several sample projects that show the value of cloud seeding to enhance the water cycle:

  • Desert Research Institute, based in Reno, Nevada runs a wintertime research program that is renowned worldwide. They were established in the 1970s, when they pioneered the development of modern generators and equipment. By 2009 they had 300 research projects operating on several continents, and had helped establish similar research institutes in 25 countries to study the effects of cloud seeding.
  • Metropolitan Water District of Southern California - This major water supplier has been financing water districts in Colorado for several years to increase snow pack in the Colorado Mountains. The end result has been an increase of water flowing down the Colorado River, from which Southern California draws 1/3 of its water supply. The project benefits MWD's customer water districts and neighboring states who also draw from the Colorado River, and who also contribute money to the project.
  • The Government of India - The government is experimenting with seeding clouds on the leeward (rain shadow) side of mountains during the monsoon season. As a cloud is blown across the land by wind, it is caught by cold mountains, where it drops some of its rain or snow. The rest is blown over the mountain to the leeward side, where it usually dissipates in the warmer air. The government is hiring aircraft with specialized instruments from South Africa and Israel to seed these clouds before they evaporate completely.
  • Government of China - China has the biggest ongoing cloud seeding program of any country in the world, spending about $90 million per year to increase rainfall throughout the country for farmers, and clear the air of pollutants over major cities. In 2007 they started "selling clouds" to private companies holding outdoor events, who wanted to seed for fresh air. In 2012 the government developed plans to expand the program yet further to seed drought-ridden areas across the Qilian and Tian Shan Mountains.
Cloud Seeding Plans - China is preparing to seed in the beautiful Tian Shan Mountains to increase snow pack.

Cloud Seeding Plans - China is preparing to seed in the beautiful Tian Shan Mountains to increase snow pack.

Chemtrail Suppliers & Service Providers

In addition to governments and their contractors, there are numerous private companies supporting the industry. These include raw materials and equipment suppliers, service providers like mechanics and meteorologists, researchers like universities and government agencies, and financiers who pay for experimental runs. Here are some examples of supporting companies.

  • Seeding Media - The most common seeding medium used is silver iodide, often mixed with indium trioxide. Other media used, depending on weather conditions, are liquid and frozen carbon dioxide (dry ice), liquid propane, and sea salt. Sulfur hexaflouride is often used as a tracer ahead of time to determine in what direction and how fast the air might be moving. Larger cloud seeders purchase raw materials in powder form directly from leading chemical companies, like Deepwater Chemicals, to assemble themselves. Others purchase already assembled and packaged media from the larger seeders.
  • Applicators - Applicators come in the form of hollow metal attachments to the wings of aircraft, ground-based generators that shoot media upward, or canisters that shoot liquid through a ground vehicle or aircraft's exhaust. Ice Crystal Engineering is one company that makes flares (applicators) for aerial application of silver iodide. (Silver iodide needs to be burned in order to stabilize its structure for cloud seeding.)
  • Aircraft - In India the private company Agni Aero Sports Adventure Academy manufactures microlight aircraft, trains pilots, and operates a rain creation program. In the United States, Weather Modification, Inc., operates and rents out a fleet of several models of more than 35 twin-engine aircraft.
  • Training - The University of North Dakota has a training program for young pilots to learn how to seed clouds as part of the university's accredited weather modification program. By the end of 2012 they had trained over 325 pilots. North Dakota started seeding in the 1950s, primarily to reduce the size of hail in hailstorms.
Air-Spraying Equipment - This is a wing mounted generator for spraying silver iodide.

Air-Spraying Equipment - This is a wing mounted generator for spraying silver iodide.

New Cloud Seeding Technology

  • Sea Salt Spray - Microsoft's Bill Gates is financing an interesting project to reduce the heat of the planet by increasing cloud cover over the oceans. The video at right shows San Francisco inventors funded by him who have created an unmanned, floating sprayer that would throw sea salt specks into the sky to condense moisture. Some of the technology uses principles discovered by Anton Flettner from Germany.
  • Laser Seeding - German, Swiss, and French researchers have meanwhile developed a new laser technique for increasing raindrop size, which they have started testing over the skies of Berlin. The laser, with a potential power greater than 1,000 power plants, fires into the atmosphere, reconstituting atoms in the air into components that could seed bigger and better water droplets - assuming there is enough water vapor in the air to respond accordingly.

Cloud Seeding Costs

On the surface of it, cloud seeding appears to satisfy a number of public needs, but it does not come without a cost. One of the concerns is the cumulative public health and environmental effects of the types of chemicals used in the process. Another is the potential danger of taking rain away from an area that might need it more, or drying the air faster than it's able to rehumidify, resulting in subsequent years of droughts and/or fires (which seems to be happening in Texas right now). Yet a third is the potential for creating floods, either from seeding too much or from strong winds that carry seeded clouds further than expected. Some of these concerns are being addressed already. Others are yet to come.

For more information:

Questions & Answers

Question: What companies can we buy that are listed on the stock market that do cloud seeding (besides Microsoft, because it's too expensive)?

Answer: It's looking like most of the cloud seeding companies are still private. Hence there are no investments available yet. It's a relatively small market with great potential, so the companies are busy responding to work requests, rather than setting up for the stock market (which takes quite a bit of time and energy). Consider that the largest cloud seeding company in the world, Weather Modification Inc., had only 14 employees in 2016, and you see how small this active industry is right now.

Question: Doesn't cloud seeding cool temperatures and do the utility companies profit from this activity?

Answer: Water cools temperatures, whether in its vapor form or condensation form. Cloud seeding causes water vapor in the atmosphere to coalesce and fall, which cools the air and earth below temporarily. But then it also clears the sky of vapor, which lets more of the sun through, so it's hotter afterward in summer that's not so good. In winter, maybe.

Utility companies do not benefit financially, but they do regarding continuing to provide water to their customers; water which might otherwise not be available. For example, the Metropolitan Water District of Southern California (MWD) is one of several agencies giving money to Colorado to seed clouds in the Rocky Mountains. The aim is to increase snow, snowmelt, and water flowing down the Colorado River, which has been slowly going dry. The situation has become dire enough that the river is expected to be completely dry where it flows into the ocean (it's "mouth") by 2020, i.e., next year. All seven states fed by the river are doing whatever they can to help out, including conservation and cloud seeding.

Question: What about depression, since we would lose a lot of light and energy from the sun––minimizing sun rays (which we need for Vitamin D) by how much?

Answer: I lived for many years in Oregon. There the lack-of-sun syndrome is called Seasonal Affective Disorder (SAD) and, yes, I got it too. But Oregon gets plenty of rain, at least on the west side of the Cascade Mountains, so that is not a place where anyone would seed clouds. In California, where I live now, cloud seeding IS taking place. Because California's tourist industry depends on beautiful, sunny days though, cloud seeders are not going to be seeding enough to hurt the industry. Cloud seeding is an experiment, so there will be trials and errors, but the aim is to produce just enough rain to keep it green, yet not enough to destroy the sunny ambiance. Eventually, researchers will hopefully find a way to breed the rain-making bacteria, Pseudomonas syringae, so we won't have to use manufactured chemicals and it can rain naturally.

Question: Why couldn't cloud seeding used to dissipate cyclones/typhoons before they become destructive? Why aren't unmanned aircraft used to deliver agents less costly? Even if the aircraft is destroyed wouldn't the cost be minimal compared to the cost of the damage caused by a cyclone/typhoon?

Answer: China has used it to disperse air pollution. Kansas uses it to reduce damage from hailstorms (to disperse the hail before stones get too big). And there are many experiments going on about how it can do exactly what you're saying: Mainly to redirect and/or lessen the might of hurricanes/cyclones/typhoons. Here's a Wikipedia article on one of those experiments: Operation Stormfury.

One thing to note is that air pressure is a major factor in creating such storms, and cloud seeding does not affect that, so its beneficence is questionable. However, there are politics going on too. With the increase in the intensity of cyclones being attributed to climate change, anti-climate-change governments are limiting the money available for such experiments.

Question: How can we start a cloud seeding business in India ?

Answer: Not being from India, it would be hard for me to give you particulars, but I can give you some ideas for how to find out. I know India has been looking at cloud seeding for about 60 years, and several state governments have tried it out. Where you'll want to start, then, is finding out how those governments actually set up the projects. Then look to see what the rules are for setting up a small business of your own. Then start looking at costs and create a budget. Meanwhile, you're gathering support from others—people who want to work with you to create the business in some way.

In the United States we would write a business plan—how, exactly, we're going to start the business, what it will do, what equipment is needed and how we'll get it, who we'll work with, etc. You may have to get a license . . . but those details are for you to figure out because it will be different in India.

Here is an article about a couple of states in India that have recently carried out cloud seeding projects. Find someone to talk to from each of those state governments who were involved in the project and ask how they did it. Talk to the pilots of the planes and ask them how it went. Find out where they got their supplies. This will give you a start.

Question: Chemtrails seems to be an invalid concept, at least it is highly controversial, does it need to be in this otherwise very nice article?

Answer: Thank you for asking this question. I've reread the article, looked at the definition of chemtrails and, you're right, it doesn't belong here. I've since edited it out.

Question: Is cloud seeding sustainable?

Answer: I believe we haven't found the best way to seed clouds yet. Personally, I don't hold to using chemicals if there's another, more natural solution, and I believe there is. Last year a pHd student at MIT put together a dissertation request—based on another article I wrote about the ice-nucleating bacteria, Pseudomonas syringae—to experiment with cultivating the bacteria downwind of a location desiring rain. I don't know what the result will be, but it seems to me like it should work and could be perfected as a much more sustainable way of cloud seeding than spraying silver iodide.

© 2013 Susette Horspool


Susette Horspool (author) from Pasadena CA on May 19, 2020:

You're welcome, Marley. Good luck with your test.

marley on May 18, 2020:

thanks a lot for this I leaned a lot from it and I may get a 100% on my test I have to do thank you a lot

Susette Horspool

Susette Horspool (author) from Pasadena CA on December 02, 2018:

Interesting, AngelWings. Your videos led to another one that illuminated something for me:

I probably need to do more research, but here is what it appears to me now. There appear to be four things going on that are getting mixed up: Natural contrails being the moisture eliminated by jets as they fly, the small-scale spraying of cultivated and dried P. syringae at ski resorts to make it snow, the large-scale spraying of silver iodide in an attempt to make it rain, and the larger-scale spraying of heavy metals, higher in the atmosphere, to create a thin reflector that would soften the effect of the sun's rays.

Are there five? IS the military spraying to deliberately hurt citizens??? Somehow I doubt that. It would be too hard to control who gets hurt and who doesn't. All of this, though, looks like material for more articles––to find out and to pull it all together, so we can see the overall pattern.

Susette Horspool (author) from Pasadena CA on October 06, 2018:

Hi Eva––This article just states the case, it doesn't do judgement calls. I'm actually surprised they're cloud seeding in the NE. Seems to me like you guys have plenty of rain already, and this technology would be better used in drier regions. Do you know anyone you can contact to stop it in your area?

Susette Horspool (author) from Pasadena CA on May 31, 2018:

This is not the kind of bacteria that causes disease in humans (lol). It's been creating rain far longer than humans have even existed. We're only just now discovering it, because we had no inkling to even look for it before. In fact, we noticed the way it colonized on tomatoes before anything else and, not knowing it created rain, we tried to kill it off. Good luck, huh? First, it kept coming back because it was a necessary part of the rain. Second, if we kill it off, we seriously disturb the rain cycle and THAT will hurt humans. No rain, no food, and we starve.

AF on May 30, 2018:

sure just spray the skies with bacteria. Smart idea. Don't worry about us or anything. No oversight, no accountability. Gee I wonder how this might affect those with compromised immune systems? No one cares about them do they. Just play God whenever you want and spray the air we breathe with whatever you feel like. SCUMBAGS!

Kristen Howe from Northeast Ohio on March 14, 2015:

Wow! This was an well-thought out and planned article. So full of information on clouds and cloud seeding like the sea salt spray. Lots of stuff I didn't know about. Voted up!

Susette Horspool (author) from Pasadena CA on March 05, 2015:

Yes, it is. That's what this article is about. Thanks for reading, Blackspaniel1.

Blackspaniel1 on March 04, 2015:

The way seeding works is to introduce ice. Seeding with a chemical that mimics the crystal structure of ice is the key. Ice forms and takes gaseous water to increase in size. Melting on the way down will result in rain. One problem is to enhance a cloud, reap the benefits, but have the cloud continue to grow and produce hail on another location, so care must be taken.

Susette Horspool (author) from Pasadena CA on June 27, 2013:

Thanks Billybuc, I will.

Bill Holland from Olympia, WA on June 27, 2013:

This is the kind of article that will do well in certain magazines. Find the environmental and science mags and start submitting. You obviously know your stuff and you write well.....go do it, my friend.

Susette Horspool (author) from Pasadena CA on March 22, 2013:

"Lost in the clouds" - I like that. Haven't been able to write much lately (getting ready to move) but I intend to write about seeding the Colorado River next. MWD gave me a contact with the guy in Colorado's Dept. of Water who is in charge of the seeding program for the state. Can't wait to talk to him and find out more.

Sid Kemp from Boca Raton, Florida (near Miami and Palm Beach) on March 22, 2013:

This is absolutely fascinating. I heard about cloud seeding back in the 1960s, but not about it's use in the Vietnam war. Back then, a lot of science fiction predicted its use. But I never heard of any ongoing practical applications - it's been kind of a shadow industry - or maybe lost in the clouds!

I'm amazed at how you find this stuff. Excellent research!

Susette Horspool (author) from Pasadena CA on February 21, 2013:

I recently talked to the Metropolitan Water District of Southern California to see what kind of cloud seeding they're doing, and who is doing it around here. Turns out they are one of three states fueling money to Colorado utilities to seed the mountains that feed the Colorado River (from whence SoCal gets some of its water). They're not seeding around here (Pasadena) but utilities like SoCal Edison and Pacific Gas & Electric are. I intend to find out more.

Jo from Isle of Wight UK on February 21, 2013:

A really well written article. I am doing some research of my own on the Island that I am living on, and the results are extremely worrying. Chem trails are a huge problem all over the world, and despite public pressure, government agencies are not eluding to the agenda here. Cloud seeding or weather modification is not a good thing at all, and does not serve the eco systems, plant life and humans well. I watched a very interesting film recently called 'What in the World are they spraying'. We all need to look up more and question what we are seeing.

Eric Dierker from Spring Valley, CA. U.S.A. on January 31, 2013:

Thanks a bunch that is really interesting. Wow they used it in war. And they used it in the forties in California.