What US States Use Cloud Seeding: A Deep Dive into Precipitation Enhancement Efforts

I remember a particularly dry summer in my childhood home in rural Colorado. The grass was brittle, the riverbeds were parched, and whispers of water restrictions filled the air. It felt like the sky had simply forgotten how to weep. This memory, etched deeply, makes the question, "What US states use cloud seeding?" resonate with a very personal significance. It's not just about abstract science; it's about the tangible hope for rain, for snowpack, for life-sustaining water, especially in regions grappling with drought. As I’ve learned more about this fascinating field, I’ve come to appreciate the intricate science and the varied motivations behind these precipitation enhancement programs across the United States.

So, what US states use cloud seeding? The answer is, quite a few, particularly those in the Western United States that face arid conditions and rely heavily on natural precipitation for their water resources. Cloud seeding, a weather modification technique, aims to increase precipitation—either rain or snow—by dispersing substances into the atmosphere that can encourage the formation of ice crystals or water droplets within clouds. These substances, most commonly silver iodide, act as nuclei around which water vapor can condense or freeze, leading to larger droplets or ice crystals that are more likely to fall as precipitation.

While not a silver bullet for drought, cloud seeding is a tool that several states have employed for decades, primarily to bolster their water supplies, increase snowpack for winter recreation and spring melt, and sometimes to mitigate hail or fog. The effectiveness and legality of these programs can vary, and they are often the subject of ongoing research and public discussion. Understanding which US states utilize this technology requires looking at their specific water needs, environmental considerations, and the history of their weather modification efforts.

The Science Behind Cloud Seeding Explained

Before we delve into the specific US states involved, it's crucial to understand the fundamental science behind cloud seeding. It's not about "making rain from a clear sky," as some misconceptions suggest. Rather, it's about influencing existing clouds that already hold the potential for precipitation. The process relies on the physics of cloud formation and precipitation development.

Clouds are essentially vast collections of tiny water droplets or ice crystals suspended in the atmosphere. For precipitation to occur, these droplets or crystals must grow large enough to overcome atmospheric updrafts and fall to the ground. In many clouds, especially those forming at sub-freezing temperatures, there might be a lack of natural ice nuclei—tiny particles like dust or pollen—around which ice crystals can readily form. This is where cloud seeding comes in.

The Key Players: Seeding Agents

The most common seeding agent used is silver iodide (AgI). Its crystalline structure is similar to that of ice, allowing it to act as an effective ice-forming nucleus. When dispersed into supercooled clouds (clouds containing liquid water droplets that remain liquid below freezing), silver iodide particles can trigger the formation of ice crystals. Other substances, like dry ice (solid carbon dioxide), can also be used, particularly for their extreme coldness, which causes water vapor to freeze directly.

Methods of Delivery

How do these seeding agents get into the clouds? Several methods are employed:

Ground-Based Generators: These are the most common. They are strategically placed on mountaintops or in valleys. The silver iodide is burned with a fuel (like propane or acetone) to create a smoke containing microscopic silver iodide particles. These particles are then carried aloft by updrafts into passing clouds.
Aircraft: Planes equipped with flares or dispensers can fly into or above clouds and release silver iodide. This method allows for more precise targeting of specific cloud systems.
Rockets: In some cases, rockets loaded with seeding agents can be fired into clouds.

The Goal: Supercooled Clouds

Cloud seeding is most effective in clouds where the temperature is between 0 and -20 degrees Celsius (32 and -4 degrees Fahrenheit). In this temperature range, water droplets can exist in a liquid state even though they are below freezing – a condition known as "supercooling." If these supercooled droplets encounter a silver iodide particle, they can freeze, forming ice crystals. These ice crystals then grow by collecting more supercooled water vapor or by colliding with other ice crystals. Eventually, they become heavy enough to fall as snow. If the ground temperature is above freezing, this snow may melt and reach the ground as rain.

Challenges and Limitations

It's vital to emphasize that cloud seeding is not a guaranteed precipitation generator. Several factors influence its success:

Cloud Availability: There must be suitable clouds present in the first place. Cloud seeding cannot create clouds.
Atmospheric Conditions: Wind patterns, temperature profiles, and humidity levels all play a critical role.
Seeding Efficiency: The right amount of seeding agent needs to be dispersed in the correct location within the cloud.
Measuring Effectiveness: It can be incredibly challenging to definitively prove how much precipitation was *added* by seeding, as natural variability is so high. Scientists often use statistical methods and comparison with unseeded periods or areas to estimate the effects.

Despite these complexities, ongoing research continues to refine techniques and improve our understanding of cloud seeding's potential. The states that utilize it are typically those where even a small percentage increase in precipitation can have a significant impact on water resources.

The Western Water Crisis and the Rise of Cloud Seeding

The arid and semi-arid climate of the Western United States makes it particularly susceptible to drought. This region's economy, agriculture, and ecosystems are heavily reliant on consistent water supplies, often derived from snowpack in mountainous areas that melts and flows into rivers and reservoirs. When natural precipitation falters, the consequences can be severe, impacting everything from drinking water availability to the viability of ski resorts.

Historically, states in the West have been at the forefront of exploring and implementing cloud seeding programs. The desire to augment natural precipitation to fill reservoirs, sustain agricultural yields, and ensure adequate water for burgeoning populations has been a consistent driving force. It's a proactive measure taken in regions where water scarcity is not an anomaly but a recurring challenge.

Key Motivations for Western States:

Snowpack Enhancement: In mountainous areas, increasing snowfall is paramount. This snowpack acts as a natural reservoir, storing water that slowly melts and feeds rivers throughout the spring and summer. Cloud seeding aims to increase snowfall in these critical watershed areas.
Water Supply Augmentation: With snowpack comes increased water availability for downstream use in agriculture, industry, and municipal supplies.
Drought Mitigation: When droughts become severe, cloud seeding offers a potential, albeit limited, tool to help alleviate the water shortage.
Ski Industry Support: Many Western states have significant economies tied to winter tourism and skiing. Boosting snowfall can mean longer ski seasons and more prosperous resorts.
Wildfire Prevention: While not a primary driver, increased moisture can, in theory, help reduce the risk of wildfires by increasing fuel moisture content.

The development of cloud seeding in the West has often been a collaborative effort, involving state governments, water management districts, research institutions, and sometimes even private entities like ski resorts. This shared interest underscores the widespread recognition of water as a precious and often scarce resource in this part of the country.

What US States Use Cloud Seeding? A State-by-State Breakdown

Now, let's get to the core of the question: which US states are actively involved in cloud seeding operations? While the list isn't exhaustive and programs can fluctuate based on funding and necessity, several states have long histories and ongoing commitments to precipitation enhancement.

1. Colorado

Colorado is arguably one of the most active states when it comes to cloud seeding. Its mountainous terrain and reliance on its snowpack for water resources make it a prime candidate. The Colorado Water Conservation Board (CWCB) has overseen weather modification activities in the state for decades. Programs often focus on enhancing snowfall in key mountain ranges to increase water supplies for agricultural and municipal use across the state.

Operations typically involve:

Ground-based generators strategically placed in high-altitude areas.
A focus on winter storms that have the potential for snow.
Research components to evaluate the effectiveness and environmental impacts of seeding.

My own observations during ski trips in Colorado have often coincided with seeing these generators perched on hillsides, a quiet reminder of the efforts to manage their winter precipitation.

2. Utah

Utah, another mountainous Western state, has a robust and long-standing cloud seeding program. The Utah Division of Water Resources manages these efforts, primarily aimed at increasing the snowpack in the Wasatch and Uinta Mountains. This is critical for supplying water to the Wasatch Front, the most populated area of the state, as well as for supporting the state's ski industry.

Utah's program is notable for:

Its sustained commitment over many years.
A focus on scientifically evaluating the results, often partnering with universities.
The understanding that even a small percentage increase in snowpack can translate to millions of acre-feet of water.

3. Nevada

Given its status as the driest state in the US, Nevada has a vested interest in any technology that can augment precipitation. The Nevada Division of Water Resources oversees cloud seeding operations, which are often concentrated in the mountainous regions that contribute to the state's limited water resources, particularly in the northern and central parts of the state.

Nevada's approach often includes:

Targeting storms to increase snowpack in watershed areas.
Collaborations with neighboring states and water districts where river basins cross state lines.
A pragmatic approach, recognizing that cloud seeding is one tool among many for water management.

4. California

California's vast water needs and its susceptibility to severe droughts have led it to explore cloud seeding, particularly in its mountain ranges. The California Department of Water Resources has supported and conducted cloud seeding programs, primarily focused on increasing the Sierra Nevada snowpack, which is a vital source of water for much of the state.

California's efforts often involve:

A focus on the winter months and storms that can bring snow to the Sierras.
Aircraft-based seeding operations for more precise targeting.
Extensive research and monitoring to understand the effectiveness and environmental impacts.

The state’s immense population and agricultural sector mean that any marginal increase in water availability is significant.

5. Wyoming

Wyoming's economy and environment are deeply tied to its water resources, particularly snowpack in its extensive mountain ranges. The Wyoming Water Development Office has supported cloud seeding initiatives aimed at increasing winter precipitation, especially in the Wind River Range and other critical areas that feed rivers supporting agriculture and wildlife.

Wyoming’s cloud seeding programs typically aim to:

Boost snowpack in key mountain watersheds.
Support agricultural needs dependent on river flows.
Contribute to the overall water supply for the state.

6. Idaho

Similar to its Western neighbors, Idaho relies heavily on its mountainous terrain for water. The Idaho Department of Water Resources has been involved in various weather modification efforts, including cloud seeding, particularly in areas crucial for snowpack accumulation, such as the Sawtooth and Salmon River ranges. These efforts are designed to enhance water availability for irrigation, hydropower, and municipal use.

7. Montana

Montana, with its vast agricultural lands and mountainous regions, has also engaged in cloud seeding. Programs have been supported by various entities, including local water boards and agricultural groups, with the goal of increasing precipitation in key areas to support both water supplies and agricultural productivity.

8. Arizona

While primarily known for its arid climate, Arizona does have mountainous regions where snowpack can be significant. The state has, at times, supported cloud seeding efforts, particularly in the Salt River watershed, to increase snowpack and subsequent meltwater flow into reservoirs. These operations are often undertaken in collaboration with water management agencies.

9. New Mexico

New Mexico, facing its own water challenges, has also explored and implemented cloud seeding programs. These efforts are often concentrated in mountainous areas that are critical for generating runoff into the state’s river systems, aiming to bolster water supplies for agriculture and municipalities.

10. Washington

Parts of Washington, especially the eastern side of the Cascade Mountains, can experience significant precipitation. Cloud seeding efforts have been conducted, often by local water districts or ski resorts, with the objective of enhancing snowfall in targeted areas to increase water availability and support winter tourism.

It's important to note that the extent and nature of these programs can vary. Some states have extensive, state-funded programs, while others may have more localized efforts supported by specific water user groups or resorts. Furthermore, the legal framework for cloud seeding can also differ from state to state, with some having well-established regulations and others being more permissive.

The Legal and Regulatory Landscape of Cloud Seeding

The practice of cloud seeding isn't simply a scientific endeavor; it's also governed by a complex web of legal and regulatory frameworks. As weather modification technology has advanced, so too has the need for clear guidelines regarding its implementation, oversight, and potential liabilities.

Federal Oversight: The Weather Modification Control Act

In the United States, federal oversight of weather modification activities is primarily handled by the National Oceanic and Atmospheric Administration (NOAA) under the Weather Modification Control Act of 1977. This act requires:

Reporting Requirements: Anyone planning or conducting weather modification activities must report their plans to NOAA. This includes information about the location, timing, methods, and agents used.
Permitting: While NOAA doesn't issue permits for weather modification operations themselves, it maintains a record of all proposed and ongoing activities. States are generally responsible for their own permitting processes.
Environmental Review: Federal agencies are required to conduct environmental reviews for weather modification projects.

State-Level Regulations: A Patchwork of Approaches

The actual regulation and permitting of cloud seeding projects largely fall to individual states. This creates a somewhat patchwork landscape:

Permitting Authorities: States typically designate a specific agency – often a water resources department, environmental protection agency, or department of agriculture – to oversee cloud seeding permits.
Operational Standards: These state agencies often set standards for the types of seeding agents that can be used, the methods of delivery, and operational safety protocols.
Environmental Impact Assessments: Before permits are granted, states may require environmental impact assessments to evaluate potential effects on ecosystems, water quality, and wildlife.
Public Notification: Some states require public notification and opportunities for public comment before approving weather modification projects.
Liability: Determining liability in cases of perceived damage from cloud seeding (e.g., if a storm is intensified beyond what is desired) can be complex and is often addressed through state laws and permit conditions.

Interstate Considerations

A significant challenge arises when cloud seeding operations in one state might affect precipitation patterns in another. For example, a program designed to enhance snowfall in the mountains of Colorado could potentially influence weather systems moving into Kansas. This has led to the need for interstate cooperation and agreements on weather modification activities, especially in shared river basins.

Key Legal Questions and Concerns

Downwind Effects: A persistent concern is whether seeding upwind can reduce precipitation downwind. While research is ongoing, it's a factor considered in the planning and evaluation of these projects.
Adverse Impacts: Could cloud seeding exacerbate flooding or hail events? Regulatory bodies try to mitigate such risks through careful planning and operational controls.
Ownership of Weather: This is a more philosophical and legal debate, but it touches upon who "owns" or has rights to natural precipitation. Current legal frameworks generally focus on controlling the *act* of weather modification rather than claiming ownership of atmospheric moisture.

The legal and regulatory environment surrounding cloud seeding is dynamic. As scientific understanding grows and operational practices evolve, so too do the rules designed to ensure responsible and beneficial use of this technology.

Environmental Considerations and Public Perception

Like any technology that interacts with natural systems, cloud seeding is not without its environmental considerations and public perception challenges. These aspects are critical to understanding the broader context of its use across the US states.

Environmental Concerns:

Silver Iodide Accumulation: A primary environmental concern revolves around the potential accumulation of silver iodide in soil, water, and ecosystems. Studies have been conducted to assess these levels. Generally, the amounts of silver used in cloud seeding are very small, and dispersion patterns mean that concentrations are typically far below levels considered harmful. However, ongoing monitoring is crucial.
Impacts on Wildlife: Researchers also examine potential impacts on flora and fauna. For instance, increased snowfall might affect migration patterns or habitat availability for certain species. Conversely, increased water availability can support ecosystems.
Hydrological Changes: Altering precipitation patterns, even slightly, can have downstream effects on river flows, reservoir levels, and groundwater recharge. Careful hydrological modeling is essential to predict and manage these changes.
Hail and Fog Modification: While less common than precipitation enhancement, some cloud seeding efforts aim to suppress hail or dissipate fog. These applications also have associated environmental considerations, such as the potential for unintended consequences on local weather patterns.

Public Perception:

Public understanding and acceptance of cloud seeding vary widely. Common viewpoints and concerns include:

Skepticism: Some people are naturally skeptical of weather modification, viewing it as "playing God" or a technology that is not yet fully understood. Misconceptions that cloud seeding can create rain from nothing can fuel this skepticism.
Hope and Necessity: In drought-stricken areas, cloud seeding is often viewed with a sense of hope and as a necessary tool for water management. Residents understand the critical need for every drop of precipitation.
"Stealing Rain" Debate: A recurring concern, particularly in arid regions, is the idea that seeding clouds in one area might "steal" precipitation that would have fallen elsewhere. Scientific consensus generally suggests that the overall increase in precipitation from seeding is a marginal addition to the natural water cycle, rather than a redistribution of existing moisture on a large scale.
Transparency and Communication: Effective communication by the agencies conducting cloud seeding operations is vital. Providing clear information about the goals, methods, and scientific basis for these programs can help build trust and address public concerns.

My personal perspective, informed by living in a water-scarce region, is that transparency and rigorous scientific evaluation are paramount. When communities understand *why* cloud seeding is being considered, *how* it works, and *what* the potential impacts are, they are more likely to support or at least accept these initiatives. It's a delicate balance between technological intervention and respect for natural processes.

The Future of Cloud Seeding in the US

The ongoing challenges of climate change, increasing population demands on water resources, and the persistent threat of drought mean that technologies like cloud seeding will likely continue to be explored and utilized across the US states. While it's not a panacea, its potential to augment precipitation, particularly in regions where water is a critical limiting factor, remains significant.

Key Areas of Development:

Improved Scientific Understanding: Continued research is vital to better understand the precise mechanisms of cloud seeding, its efficacy under various atmospheric conditions, and its long-term environmental impacts. Advances in atmospheric modeling and remote sensing technologies will play a crucial role.
Targeted and Efficient Operations: Future efforts will likely focus on more precisely targeting seeding operations to maximize effectiveness while minimizing costs and potential side effects. This could involve more sophisticated real-time weather monitoring and adaptive seeding strategies.
Integration with Water Management: Cloud seeding will increasingly be viewed as one component within a broader integrated water resource management strategy. It will be used in conjunction with conservation efforts, water recycling, and other supply augmentation measures.
Addressing Climate Change Impacts: As climate change alters precipitation patterns, making some regions drier and others more prone to extreme events, the role of weather modification may evolve. It could become a more critical tool for adapting to these new climatic realities, though its limitations in extreme drought scenarios must be acknowledged.

The states that use cloud seeding today are often those most acutely feeling the pressure of water scarcity. Their ongoing commitment to these programs, coupled with continuous scientific inquiry, suggests that cloud seeding will remain a relevant, albeit nuanced, tool in the American water management toolkit for the foreseeable future.

Frequently Asked Questions about Cloud Seeding

How effective is cloud seeding?

The effectiveness of cloud seeding is a complex question, and there isn't a single, universally agreed-upon percentage increase that applies to all situations. Scientific studies and operational reports suggest that cloud seeding can, under the right conditions, increase precipitation by anywhere from 5% to 15%. However, it's crucial to understand what "effective" means in this context.

Firstly, cloud seeding is most effective when it is performed on existing clouds that already have the potential to produce precipitation. It cannot create clouds from a clear sky. The goal is to enhance the efficiency of precipitation formation within these clouds. This typically involves introducing ice nuclei, such as silver iodide, into supercooled clouds (clouds with liquid water droplets below freezing). These nuclei encourage the formation of ice crystals, which then grow and fall as snow or rain.

Secondly, measuring effectiveness is inherently challenging. It's difficult to conduct a perfect "control" experiment in the atmosphere, as natural weather variability is so high. Scientists use various methods, including statistical analysis of historical data, comparison with unseeded areas or time periods, and sophisticated atmospheric modeling, to estimate the impact of seeding. These studies often show a statistically significant increase in precipitation, but the precise magnitude can vary.

Furthermore, effectiveness is highly dependent on a confluence of factors: the type and temperature of the clouds, the presence of moisture, the atmospheric conditions (wind, humidity), and the correct application of seeding agents. A poorly timed or executed seeding operation, or seeding clouds that are not suitable, will yield little to no results. Therefore, effectiveness is not just about the technology itself, but also about the scientific understanding, precise execution, and favorable atmospheric conditions.

Why do US states use cloud seeding?

US states, particularly those in the arid and semi-arid Western United States, use cloud seeding primarily as a tool for water resource management. The fundamental reason is to augment natural precipitation, thereby increasing water availability. This has several critical implications:

Boosting Snowpack: In mountainous regions, snowpack acts as a natural reservoir, storing water that slowly melts and feeds rivers and streams throughout the spring and summer. Cloud seeding aims to increase snowfall in these critical watershed areas, leading to a larger snowpack. This is vital for states like Colorado, Utah, and California.
Increasing Water Supply: A larger snowpack translates directly into increased water availability for downstream users. This water is essential for a wide range of purposes, including:
- Agriculture: Providing irrigation water for crops, which is crucial for the economy of many Western states.
- Municipal Water: Supplying drinking water to cities and towns.
- Hydropower Generation: Ensuring sufficient water flow for hydroelectric dams.
- Ecosystem Health: Maintaining water levels in rivers and streams to support aquatic life and natural habitats.
Drought Mitigation: When drought conditions become severe, cloud seeding can be employed as one strategy among many to help alleviate water shortages. While it cannot end a severe drought on its own, even a marginal increase in precipitation can be beneficial.
Supporting Winter Tourism: Many Western states have economies heavily reliant on winter sports and skiing. Cloud seeding can help ensure adequate snowfall for ski resorts, extending the season and boosting tourism revenue.
Hail Suppression and Fog Dispersal (Less Common): In some instances, cloud seeding techniques are also used to reduce the size of hailstones or dissipate fog, though these applications are less widespread than precipitation enhancement.

In essence, states use cloud seeding because water is a precious and often scarce resource in many parts of the country. It represents a proactive effort to manage and enhance natural precipitation to meet the diverse and growing demands for water.

What are the environmental impacts of cloud seeding?

The environmental impacts of cloud seeding are a significant area of scientific study and public concern. Generally, when conducted responsibly and within established guidelines, the environmental impacts are considered minimal, but it's essential to understand the potential issues:

Silver Iodide: The primary seeding agent, silver iodide, has been the subject of extensive research. While silver is a metal, the quantities used in cloud seeding are very small. The silver iodide is dispersed into the atmosphere, and only a fraction actually reaches the ground. Studies have measured silver concentrations in soils, water bodies, and ecosystems in seeded areas. Typically, these concentrations are found to be well below levels considered toxic to plants, animals, or humans. However, ongoing monitoring is important to ensure that accumulation does not become a problem over very long periods or in specific, localized areas.
Other Seeding Agents: Dry ice (solid carbon dioxide) can also be used. When it sublimates, it releases carbon dioxide into the atmosphere. The amount released from typical cloud seeding operations is minuscule compared to natural CO2 levels and anthropogenic emissions, so it is not considered an environmental concern.
Changes in Precipitation Patterns: A core aspect of cloud seeding is to alter precipitation. This inherently means changing natural patterns. Concerns can arise about whether seeding could inadvertently lead to more extreme events, such as increased flooding in some areas or reduced rainfall in others (the "rain shadow" effect). Regulatory processes and scientific modeling aim to predict and mitigate such adverse effects. Most programs focus on incremental increases rather than dramatic alterations.
Ecosystem Effects: Changes in snowfall or rainfall can affect ecosystems. For example, increased snowpack might alter the timing of spring melt, affecting plant growth and wildlife migration. Conversely, increased water availability can support fragile ecosystems. Researchers study these potential cascade effects to ensure that cloud seeding does not have detrimental impacts on biodiversity or ecological balance.
Hydrological Cycle: Cloud seeding is intended to influence the hydrological cycle, but typically as a small augmentation rather than a fundamental alteration. The goal is to capture moisture that might otherwise be lost from the system.

Overall, the scientific consensus, based on decades of research, is that properly managed cloud seeding programs have negligible negative environmental impacts. However, vigilance, continued research, and careful monitoring are crucial to ensure this remains the case as techniques evolve and climate conditions change.

Can cloud seeding cause droughts or floods?

This is a common concern, and the direct answer is that **cloud seeding is not designed to cause droughts or floods, and scientifically, it is highly unlikely to be the sole cause of either.**

Droughts: Droughts are complex phenomena driven by large-scale atmospheric patterns, prolonged periods of low precipitation, and high evaporation rates, often influenced by climate change. Cloud seeding is intended to *augment* existing precipitation. It requires clouds that already contain moisture. If there are no suitable clouds, cloud seeding cannot generate rain or snow. Therefore, it cannot create precipitation out of nothing and cannot end a severe drought by itself. In conditions of extreme drought where suitable clouds are absent, cloud seeding operations would simply be ineffective.

Floods: Similarly, major floods are typically caused by a combination of factors, such as prolonged heavy rainfall over an extended period, rapid snowmelt, or storm surges. Cloud seeding aims to increase precipitation by a modest percentage (e.g., 5-15%) under specific storm conditions. This incremental increase is generally not enough to trigger widespread flooding on its own, especially when compared to the natural variability of storm intensity. However, there is a theoretical concern that seeding a very intense storm *could* potentially add to the volume of precipitation. This is why operational protocols often include thresholds and precautions. For instance, seeding might be halted if a storm system is predicted to deliver an excessive amount of precipitation naturally. Regulatory bodies and experienced operators carefully monitor weather forecasts and storm characteristics to mitigate the risk of exacerbating existing flood potential. The goal is to enhance beneficial precipitation, not to create hazardous weather events.

In summary, while cloud seeding influences precipitation, it operates within the context of existing weather systems. It's an augmentation tool, not a weather creation or weather-control-in-extremes tool. The scale and nature of natural weather events mean that attributing a drought or a flood solely to cloud seeding is scientifically unsupported.

Which states have ongoing cloud seeding programs?

Several US states, primarily in the Western part of the country, have ongoing or have had recent cloud seeding programs. The level of activity can vary year to year based on funding, drought conditions, and specific water management needs. The most prominent states that have utilized cloud seeding, often for many years, include:

Colorado: Has one of the longest and most active programs, focusing on increasing snowpack in its mountain ranges for water supply.
Utah: Maintains a significant and scientifically studied program aimed at bolstering snowpack in the Wasatch and Uinta Mountains.
Nevada: Utilizes cloud seeding to enhance limited water resources, particularly in its northern mountainous regions.
California: Has conducted various cloud seeding projects, often targeting the Sierra Nevada snowpack for crucial water supplies.
Wyoming: Engages in cloud seeding to augment winter precipitation, supporting its water resources and agricultural sectors.
Idaho: Has supported cloud seeding initiatives, especially in critical watershed areas.
Montana: Has had programs aimed at increasing precipitation for agriculture and water supply.
Arizona: Has supported seeding efforts, particularly in its higher elevation watersheds.
New Mexico: Has utilized cloud seeding to enhance water availability from mountainous regions.
Washington: Some regions, particularly in the Cascades, have seen cloud seeding operations.

It's important to note that "ongoing" can mean different things. Some states have continuous, state-funded programs, while others might have projects that are funded periodically or by specific water districts, ski resorts, or agricultural associations. The legal and regulatory frameworks also differ, with states like Colorado and Utah having well-established programs and oversight bodies.

What US States Use Cloud Seeding: A Deep Dive into Precipitation Enhancement Efforts