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NASA has created small, temporary artificial clouds and visible vapor trails during specific sounding-rocket experiments—but it is not creating ordinary weather clouds over countries around the world. The experiments take place roughly 80–90 kilometers above Earth, near the edge of space, to study atmospheric physics. They are different from cloud seeding, storm control, or a global weather-manipulation program.
What the claim gets right—and wrong
NASA has deliberately released material into the upper atmosphere to create either a small ice cloud or a visible tracer plume. Those are real experiments. But the phrase “over many countries around the world” can make separate launches at specific sites sound like one coordinated, worldwide cloud-making operation. The documented missions were localized, had different scientific aims, and did not create ordinary rain or storm clouds.
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It also matters what “cloud” means in each case. Some are ice crystals high in the mesosphere; some are narrow trails of glowing tracer vapor used to measure winds. A rocket can also add exhaust products that later contribute to naturally occurring high-altitude ice clouds. These are related atmospheric phenomena, not interchangeable evidence of weather control.
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Super Soaker: making a small cloud near Alaska
NASA’s best-known deliberate cloud-formation test was the Super Soaker experiment, launched from Poker Flat Research Range near Fairbanks, Alaska, on January 26, 2018. The mission used three sounding rockets: two released vapor tracers to measure background winds, while a third released about 220 kilograms (485 pounds) of water at an altitude of roughly 85 kilometers (53 miles).
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A small cloud formed and was detected by ground-based lidar about 18 seconds after the release. The goal was to investigate how concentrated water vapor affects polar mesospheric cloud formation—not to make weather or precipitation. The experiment and its purpose are described by NASA; the detailed analysis appears in the Journal of Geophysical Research.
How water can form ice clouds so high up
The mesosphere is extremely cold, but it is also very dry. Under ordinary conditions, that combination does not always provide enough water for ice clouds to form. A concentrated release changes the local conditions: it adds water vapor, raises the local frost point, and, as the vapor expands and emits infrared radiation, can cool parts of the plume rapidly. The study’s analysis estimated cooling of about 25 kelvins in the plume. Ice can then form in that small, altered patch of atmosphere.
This is not the same as spraying a broad area from an aircraft. It is a temporary, localized experiment at an altitude far above the layer where most everyday weather occurs. The resulting ice cloud is a polar mesospheric cloud, also called a noctilucent cloud—not a cumulus cloud or a rain cloud.
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Why some rocket trails look like clouds
NASA also releases vapor tracers from sounding rockets so researchers can watch how the upper atmosphere moves. A visible tracer plume acts somewhat like dye in a river: by photographing how the trail shifts and spreads, scientists can infer winds and atmospheric motion. One tracer used in such work is trimethyl aluminum (TMA), which produces a visible luminous trail when it reacts with oxygen under suitable conditions. A streak in a photograph may therefore be a tracer plume rather than a water cloud. NASA explains the technique in its overview of vapor tracers.
Documented missions took place at specific sites
- Alaska, January 2018: Super Soaker released water near Fairbanks to study artificial polar mesospheric cloud formation.
- Marshall Islands, June 2019: NASA’s Too-WINDY mission launched two Black Brant IX sounding rockets and released TMA vapor. The visible plumes helped researchers study disturbances in the equatorial ionosphere. NASA’s mission account describes the experiment.
- Norway, March 2023 and November 2024: The Vorticity Experiment (VortEx) launched sounding rockets from Andøya Space, using vapor tracers to investigate swirls and vortices near the mesosphere–thermosphere boundary. NASA reported the November 2024 campaign as the conclusion of the mission. See NASA’s VortEx report.
These examples establish that research plumes have been created in several locations. They do not establish a continuing program to create clouds worldwide; each was a named mission at a particular launch site for a particular research question.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Rocket exhaust can also affect natural night-shining clouds
Not every rocket-related cloud is deliberately made as an experiment. Rocket exhaust includes water vapor and other material, and under the right conditions exhaust products can help ice clouds form in the upper atmosphere. NASA’s AIM analysis found a relationship between morning launches south of 60° north latitude and the frequency of mid-latitude noctilucent clouds observed between 56° and 60° north. Atmospheric winds can transport exhaust products away from a launch site, so an effect need not appear directly overhead.
That finding is conditional, not a claim that every launch produces a visible cloud. The outcome depends on factors such as launch timing and altitude, exhaust, temperature, water vapor, season, latitude, winds, and whether any resulting ice is visible. NASA discusses the observations in its AIM mission report. An exhaust contribution to cloud formation is an atmospheric side effect, not proof of a deliberate worldwide cloud-making campaign.
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Noctilucent, or polar mesospheric, clouds are made of tiny ice crystals and typically form around 80 kilometers (50 miles) above Earth. They occur naturally, especially in the cold summer mesosphere near the poles, where ice can form around extremely small particles, including meteoric smoke. Because they remain high enough to catch sunlight after sunset at ground level, they can appear as faint, blue-white, wispy structures against a darkening sky. Scientists study them because changes in upper-atmospheric temperature and water vapor affect their formation.
Is this cloud seeding or weather control?
No. Conventional cloud seeding is intended to influence precipitation in existing, lower-atmosphere clouds, often by introducing particles such as silver iodide. The NASA experiments discussed here took place in the upper atmosphere and studied winds, ionospheric motion, or ice-cloud physics. Their documented purpose and scale do not match a program to make rain, steer storms, or control weather over countries or continents.
That conclusion follows from the missions’ described altitudes, materials, limited releases, and research objectives. Creating a small experimental plume demonstrates that a local physical process can be studied; it does not demonstrate the ability to direct weather systems. The available evidence does not support claims that NASA is spraying countries to control their weather.
What might a photo or video show?
A dramatic image alone does not identify what is in the sky. Depending on the circumstances, it could show:
- a narrow, illuminated vapor-tracer plume released by a sounding rocket;
- a naturally occurring noctilucent cloud, potentially influenced by rocket exhaust;
- an ordinary cloud or a conventional aircraft contrail; or
- a structure detected by radar rather than a cloud visible to the naked eye.
For example, some ionospheric structures studied by NASA look cloud-like in radar data but are not visible clouds. The SEED mission description explains that distinction. To assess a particular image, check its date, location, launch context, source, and whether the feature was observed visually or by an instrument. A real plume can still be misleadingly captioned; a photograph by itself does not prove a global program.
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