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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteCloud seeding can increase precipitation in some favorable conditions, but it does not make rain from clear skies or give operators broad control over weather. The strongest causal evidence identified by the World Meteorological Organization (WMO) is for wintertime glaciogenic seeding of orographic clouds—clouds formed as moist air rises over terrain. That finding is specific to a method and setting; it is not proof that every seeding operation works or that seeding can control storms.
What cloud seeding means—and what “rainmaking” can imply
Cloud seeding is the deliberate dispersal of particles into existing clouds to try to influence the processes that produce precipitation. It is a local or regional weather-modification technique, not a way to create the moisture, clouds, or energy needed for a weather system. The WMO says it is not possible to create rain-producing cloud systems from nothing or alter winds to bring moisture into a region.
“Rainmaking” is a looser term. It can describe cloud seeding, but it is also used to suggest much broader control than the science supports. Cloud seeding is distinct from climate intervention or geoengineering, which have different scales and aims. The WMO describes weather modification as a developing technology and says it neither promotes nor discourages the practice; it supports scientifically sound research and good practice. Its statement, dated 14 June 2025, says it contains information only through June 2024. Read the WMO statement.
Where the evidence is strongest
The clearest causal evidence described by the WMO concerns wintertime glaciogenic orographic cloud seeding. “Glaciogenic” means the method targets ice-crystal processes; “orographic” refers to clouds associated with air rising over mountains or other terrain. In suitable winter clouds, seeding can influence the formation and growth of ice particles that may eventually fall as precipitation.
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A causal finding in this setting is not a blanket verdict on cloud seeding. It does not establish that every operation produces measurable extra snow or rain, nor that findings transfer to other seasons, cloud types, or locations. The WMO characterizes evidence for other methods and cloud regimes as less certain.
What the precipitation estimates do—and do not—show
In the studies it reviewed, the U.S. Government Accountability Office (GAO) found estimates of additional precipitation ranging from 0 to 20 percent. This is a range across reviewed studies, not a guaranteed yield, a universal average, or a forecast for any particular operation. GAO says limited research and difficulties evaluating effectiveness prevent drawing a general conclusion from the range. GAO’s 2024 assessment was published on 19 December 2024.
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Different kinds of evidence answer different questions. Physical observations can show whether seeding particles affected cloud processes; statistical analysis can estimate whether precipitation increased relative to what would otherwise have happened; operational records can show that an activity was reported. An observation of a microphysical change is not, by itself, a measured increase in precipitation, and a record of an operation is not proof that it caused a change.
Why results are difficult to establish and apply elsewhere
Clouds and precipitation vary naturally, making it hard to separate a small seeding effect from what the weather would have done without intervention. The WMO notes that convective clouds targeted by hygroscopic seeding have complex dynamics and naturally variable precipitation, so a potential effect can be weak compared with background variation.
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The target process also differs by method. Glaciogenic seeding aims to affect ice-crystal processes, while hygroscopic seeding aims to affect liquid droplets and collision and coalescence. Wintertime orographic clouds are not interchangeable with warm-season convective clouds. Evidence from one method or environment therefore cannot establish effectiveness in another; the local cloud characteristics and the way a study measures outcomes matter.
- Physical plausibility: whether a proposed process could affect cloud particles.
- Observed process: whether measurements show the intended microphysical chain of events.
- Precipitation attribution: whether a study can credibly estimate additional rain or snow against natural variability.
- Operational claims: whether reported activity or estimated outcomes are supported by reliable records and evaluation.
Can cloud seeding cause floods or control hurricanes?
The WMO reports no demonstrated cloud-seeding method for modifying floods or other severe weather, and no generally accepted evidence that tropical cyclones can be modified. It also says no method has been demonstrated for modifying tornadoes or lightning danger through cloud seeding. These are not established capabilities of the technology.
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The WMO warns that claims of large-scale or dramatic weather-modification effects lack a sound scientific basis and should be treated with suspicion. A storm occurring after, or near, a seeding operation does not establish that the operation caused it; that would require evidence that distinguishes the alleged effect from natural weather processes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What U.S. activity reports can tell you
In the United States, the Weather Modification Reporting Act requires anyone intending to conduct weather-modification activities, including cloud seeding, to report to the NOAA Administrator at least 10 days before the activity. NOAA explains the reporting requirement and addresses circulating weather-modification claims in its weather-modification fact check.
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A report is an activity record, not a verified effectiveness dataset. In a report published 23 February 2026, GAO found that NOAA was not fully meeting its responsibilities to maintain and share weather-modification reports. GAO estimated that over half of filed reports likely contain errors, including missing required information such as maps. Inconsistent reporting and failures to report also limit the public record. See GAO’s 2026 oversight review.
GAO also found that state and local agencies across nine states were spending or planning to spend at least $20 million in 2024 on cloud seeding to increase local precipitation as rain or snow. That is an expenditure figure, not evidence that the programs achieved a measured increase.
What is known about environmental and health concerns
GAO’s review of the limited recent studies it examined suggests that silver iodide does not pose an environmental or health concern at current levels. The evidence does not establish whether much wider use would affect public health or the environment, so this finding should not be read as an unrestricted safety guarantee. GAO’s assessment discusses the limitations.
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