I. The Statute
On December 18, 1971, Congress enacted Public Law 92-205, 85 Stat. 736, the Weather Modification Reporting Act, codified at 15 U.S.C. §§ 330 through 330e. The Act requires that all persons who conduct weather modification activities within the United States or its territories report such activities to the Secretary of Commerce at least ten days prior to undertaking them, and after. The Secretary, in turn, is required by Section 330b to maintain a record of weather modification activities, including attempts, which take place in the United States, and to publish summaries thereof from time to time. The implementing regulations at 15 CFR Part 908 delegate the intake of these reports to the Administrator of the National Oceanic and Atmospheric Administration, at the email address weather.modification@noaa.gov.1
The mechanics of compliance are precise. An initial report on NOAA Form 17-4 must be received by the Administrator at least ten days before the commencement of the weather modification activity. An interim report on Form 17-4A is due no later than forty-five days after January 1 of any year, summarizing each month of the preceding year for any project continuing past December 31. A final report is required within forty-five days of the date the final weather modification activity occurred. The forms demand the designation of the project, the names and addresses of the sponsor and operator, the beginning and ending dates of the project, the specific purpose, the description of apparatus and seeding agents to be used, the number of days and hours of operations, and the total amount of seeding agent used. The price of noncompliance is fixed by 15 U.S.C. § 330d and by 15 CFR § 908.10: “Any person who knowingly and willfully violates section 330a of this title, or any rule issued thereunder, shall upon conviction thereof be fined not more than $10,000.”2
II. The Definition
The operative definition sits at 15 CFR § 908.1(c): a weather modification activity is “any activity performed with the intention of producing artificial changes in the composition, behavior, or dynamics of the atmosphere.” Section 908.2 provides that “any person engaged or intending to engage in any weather modification activity in the United States shall be subject to the reporting provisions of this part.” The intention is doing the heavy lifting in that sentence, and it will be doing the heavy lifting in Section IX as well.3
Section 908.3(a) then enumerates eight activities that, “when conducted as weather modification activities, shall be subject to reporting.” Item one: “Seeding or dispersing of any substance into clouds or fog, to alter drop size distribution, produce ice crystals or coagulation of droplets, alter the development of hail or lightning, or influence in any way the natural development cycle of clouds or their environment.” Item two: using fires or heat sources to influence convective circulation or to evaporate fog. Item three: “Modifying the solar radiation exchange of the earth or clouds, through the release of gases, dusts, liquids, or aerosols into the atmosphere.” Items four through eight cover modifying the characteristics of land or water surfaces, releasing electrically charged or radioactive particles or ions, applying shock waves or sonic energy sources, using aircraft propeller downwash or jet wash, and using lasers or other sources of electromagnetic radiation. Section 908.3(b) adds a catch-all: “other similar activities falling within the definition of weather modification as set forth in § 908.1 are also subject to reporting.” Section 908.3(c) exempts activities of a purely local nature, an exemption presently restricted to lightning deflection devices, small heat sources and fans used to prevent frost damage, and “religious activities or other ceremonies, rites and rituals intended to modify the weather.” A rain dance is exempt. Rain is not.4
III. The Operator
The operator is the cloud. A typical fair-weather cumulus is about one kilometer across, giving it a volume of roughly one billion cubic meters. Peggy LeMone, a researcher at the National Center for Atmospheric Research, measured the size of such a cloud by recording her car’s odometer as she drove beneath its shadow, and at the average cumulus water density of half a gram per cubic meter, the cloud contains about 500 million grams of water: 500,000 kilograms, or 1.1 million pounds. That is the weight of one hundred African bush elephants, or four blue whales. The maximum takeoff weight of a Boeing 747-400 is 910,000 pounds, which is to say that the licensed aircraft that file weather modification reports weigh less than the unlicensed clouds they fly through.5
The density figure is conservative. The cumulonimbus, the thunderhead, holds roughly the same proportion of water to air but is on the order of 50,000 times larger by volume than the fair-weather cumulus, carrying on the order of twenty-five million tonnes of water. Clouds dominate the space-based view of the planet: a study based on nearly a decade of MODIS satellite data estimated that about 67 percent of the Earth’s surface is typically covered by clouds. The atmosphere at any given moment holds the equivalent of approximately 13,000 cubic kilometers of water, evaporated from the oceans, vegetation, and lakes at a rate of 1,580 cubic kilometers per day, with nearly the same volume falling back as rain and snow every day. A NASA water budget assessment placed annual global precipitation at 403,500 cubic kilometers over the oceans and 116,500 cubic kilometers over land. Every drop of it fell from a cloud. None of the clouds filed.6
A typical cumulus cloud weighs 1.1 million pounds, the weight of one hundred elephants. The maximum takeoff weight of a Boeing 747 is 910,000 pounds. The licensed aircraft that file weather modification reports weigh less than the unlicensed clouds they fly through.
IV. The Method
Consider what a cloud does with that mass. Water vapor condenses around microscopic particles into droplets at a density of roughly one million droplets per cubic meter, the droplets coalesce, drop size distributions shift, ice crystals form, hail develops, and lightning discharges within the electrified interior. This is not an analogy to item one of Section 908.3(a). It is the item. The regulation describes the seeding or dispersing of any substance into clouds or fog to alter drop size distribution, produce ice crystals or coagulation of droplets, alter the development of hail or lightning, or influence in any way the natural development cycle of clouds or their environment. A cloud is a continuous, self-executing instance of the regulated activity: it seeds, it disperses, it alters drop size distribution, it produces ice crystals, it develops hail and lightning, and it influences in every way the natural development cycle of clouds and their environment, because it is the environment.7
Form 17-4A, the interim and final reporting form, requires the operator to tabulate the days seeded per month and the quantities of agent released. The cloud is both the apparatus and the target area. The days seeded per month are every day. The agent released is water, measured in millions of tonnes per storm. The form requires the beginning and ending dates of the project. The project began when the cloud formed and ended when it rained itself out, dates the operator would have needed to state ten days before commencement, a lead time the regulation demands of an operation that begins with no notice at all. In fifty-four years of the reporting obligation, no cloud has met the deadline.8
V. The Shade
Item three of Section 908.3(a) requires reporting of “modifying the solar radiation exchange of the earth or clouds, through the release of gases, dusts, liquids, or aerosols into the atmosphere.” The cloud performs this continuously and without releasing anything. Every cloud that passes overhead reduces the sunlight reaching the surface beneath it; that is what a cloud’s shadow is, and LeMone measured her cloud by driving under its shadow. Across the 67 percent of the Earth’s surface typically under cloud, the solar radiation exchange of the earth is being modified at this moment, by the cubic kilometer, with no release of gases, dusts, liquids, or aerosols required, because the water was already there.9
The Government Accountability Office’s 2026 review of the program, GAO-26-108013, confirms that the regulation treats the modification of “the solar radiation exchange of the earth or clouds” as a reportable weather modification activity, and describes solar geoengineering strategies such as marine cloud brightening and cirrus cloud thinning as falling within the Act’s scope. The human operators proposing to brighten marine clouds file their Forms 17-4. The marine clouds they propose to brighten do not.10
VI. The Permitted Competition
Against this unpermitted operation, consider the permitted one. Texas regulates weather modification under Agriculture Code Chapter 301, administered by the Texas Department of Licensing and Regulation. Only a licensee may apply for a permit. The application requires an operations plan, a published notice of intention, proof of financial responsibility, and, on the written request of twenty-five persons, a public hearing in the affected area. The permit fee is $75. Six permits are in force in Texas at this time, issued for terms of up to four years. The state’s own fact sheet reports that a Texas Tech University assessment, using Doppler weather radar, found that seeding 101 single-cell thunderstorms in 2019 produced an additional 101,031 acre-feet of water; the seeded storms lived on average 41 percent longer than untreated neighboring storms, and rainfall from seeded cells covered an average of 44 percent more land area. Every one of those operations was licensed, permitted, noticed, and reported.11
The Mountain West operates under the same federal reporting obligation. Utah recently allocated $16 million for cloud seeding. Nevada’s legislature allocated about $600,000, and the federal Bureau of Reclamation provided a nearly $2.5 million grant for cloud seeding operations in Colorado, Utah, and Wyoming aimed at increasing the levels in Lake Mead. Nevada’s state program puts down approximately 50,000 acre-feet of water in a winter, at a cost of less than $10 per acre-foot, enough water for about 150,000 houses for a year. All of it reported to NOAA. Meanwhile, above the permitted operations, the unpermitted ones continue at a rate of 1,580 cubic kilometers of water per day, every day, without a single filing.12
VII. The Empty Registry
The registry that would hold the clouds’ filings is itself a subject of federal concern. A 2026 study in Scientific Data assembled 1,025 PDFs from NOAA’s Weather Modification Project Reports archive, representing all publicly reported weather modification activities submitted to NOAA between 2000 and 2025. That is roughly forty-one reports a year, across the entire nation. The Government Accountability Office’s report, published the same year, found that the vast majority of those reports had missing or incorrect information, and that NOAA is not fully meeting its responsibilities to collect data and adequately maintain its reports. The agency charged with collecting ten days’ advance notice of weather modification cannot get complete paperwork out of the handful of licensed operators who file voluntarily.13
NOAA’s own public guidance states plainly that the agency does not regulate cloud seeding activities, does not research or conduct weather modification experiments, and has no plans to do so in the future. It collects information. The information it collects consists of the reports of roughly forty projects a year, against an unreported operation that covers two-thirds of the planet. In 2025, Texas legislators introduced Senate Bill 1154, which would have prohibited governmental entities in Texas from engaging in weather modification and cloud seeding operations. The bill died in committee on June 2, 2025. The legislature could not bring itself to ban the six licensed operations. The unlicensed ones were not mentioned.14
NOAA does not regulate cloud seeding, does not research weather modification, and has no plans to do so. It collects information. The information consists of roughly forty reports a year, against an unreported operation covering two-thirds of the planet.
VIII. The Penalty
The price of an unreported operation is set by statute. Under 15 U.S.C. § 330d and 15 CFR § 908.10, any person who knowingly and willfully violates the reporting requirement is subject upon conviction to a fine of not more than $10,000. The Act has been in force since December 18, 1971. A single continuous violation, running daily for the fifty-four years the reporting obligation has existed, accrues at $10,000 per day to roughly $197 million, before interest, before the interim reports, and before the final report that was due within forty-five days of the last activity, a deadline that has now been missed approximately 19,700 times in succession.15
The enforcement record is a matter of public record in its absence. The penalty provision requires a knowing and willful violation by a person. The Act defines weather modification as an activity performed “with the intention” of producing artificial changes. The database of enforcement actions against clouds is empty. The database of reports from clouds is also empty. The two emptinesses are related.16
IX. The Exemption
It must be stated plainly, because the regulation states it plainly. Section 908.1 defines a weather modification activity as an activity “performed with the intention of producing artificial changes in the composition, behavior, or dynamics of the atmosphere.” The intention is an element of the offense. A cloud does not intend. It has no intention to produce artificial changes, no intention to produce natural ones, and no counsel to argue the distinction. Section 908.2 subjects to reporting “any person engaged or intending to engage” in the activity. A cloud is not a person, is not engaged, and is not intending. The reporting forms ask for the name and address of the operator and the sponsor. There is no operator. There is no sponsor.17
The exemptions, too, must be read. Section 908.3(c) exempts activities of a purely local nature, restricted in practice to lightning deflection devices, small heat sources and fans used against frost, and religious activities and rites intended to modify the weather. The rain dance, performed with full human intention to modify the weather, is exempt from reporting. The rain, performed with no intention at all, is the thing the statute was written to count. Congress exempted the intention and left the weather.18
The rain dance, performed with full human intention to modify the weather, is exempt from reporting. The rain, performed with no intention at all, is the thing the statute was written to count.
X. Conclusion
The Weather Modification Reporting Act requires every person engaged in weather modification within the United States to report to the Secretary of Commerce at least ten days before acting. The implementing regulation lists, as its first reportable activity, the seeding or dispersing of any substance into clouds or fog to influence in any way the natural development cycle of clouds or their environment. A typical cumulus cloud weighs 1.1 million pounds. A thunderstorm carries twenty-five million tonnes of water. Clouds cover sixty-seven percent of the Earth’s surface. Annual global precipitation runs to some 520,000 cubic kilometers, 116,500 of it over land. NOAA’s archive holds 1,025 reports across twenty-five years. The penalty is $10,000 per knowing and willful violation.
No cloud has ever filed a Form 17-4.
Ergo.