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Southern California Resorts Rely on Advanced Snowmaking to Counter Climate Change

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  Published in Science and Technology on Friday, December 12th 2025 at 17:21 GMT by Los Angeles Daily News

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The Science of Snowmaking: How Southern California Resorts Keep the Slopes Covered in Warm Winters

As climate change pushes average temperatures higher and brings more erratic precipitation patterns to the West, the survival of ski resorts in the snow‑sparse Southern California foothills hinges on a highly engineered process: artificial snowmaking. A feature published by the Daily News on December 12, 2025 dives into the science, technology, economics, and environmental politics that keep the region’s mountain runs operating when nature’s own snowfall is unreliable. The piece is a blend of technical explanation, case‑study interviews, and a look at the policy landscape that governs how, where, and when artificial snow can be produced.

1. The Basics of Artificial Snow: From Water to White Powder

At its core, snowmaking is a simple physical process: water is dispersed into a fine mist in a cold air stream, and the droplets freeze before they hit the ground. The Daily News explains the process in step‑by‑step detail:

1. Water Source – Resorts rely on a network of reservoirs, aqueducts, and sometimes direct river access. The article cites the California Department of Water Resources’ “Water Supply Management Act” which governs the allocation of water for recreational purposes. In many cases, snowmaking draws from seasonal runoff stored in high‑elevation lakes, allowing the resorts to tap into a “temporary” water surplus during dry winter months.

2. Cooling the Air – Modern snow guns no longer depend on cold ambient air alone. Instead, a high‑pressure compressor forces air through a spray nozzle, cooling it to temperatures well below 32 °F. The article explains that the key metric is “wet bulb temperature,” which combines ambient temperature and humidity. To produce quality snow, wet‑bulb temperatures need to fall below about –5 °F, a condition that is increasingly rare in Southern California’s high country.

3. The Snow Gun – There are several generations of machines, each improving on energy efficiency and snow quality. The Daily News highlights the latest “Super‑Squeeze” air‑steam hybrid that can produce up to 10 tons of snow per hour while using 40 % less electricity than earlier models. A side note from the article links to a 2024 study by the American Meteorological Society that quantifies the reduction in CO₂ emissions for the newest engines.

4. Deposition and Build‑up – The freshly formed ice crystals accumulate on the slope, forming a “base layer” that protects natural snow from rapid melt. Over the course of a season, resorts can lay down 40–70 ft of artificial snow, according to the Daily News’s quoted data from Sierra at the Sierra and Mammoth Mountain.

2. Technology and Innovation: Going Beyond “Spray and Wait”

While the fundamental physics remain unchanged, the technology behind snow guns has evolved dramatically in the past decade. The article details three innovations that have been game‑changers for Southern California resorts:

• “Dry‑Powder” Snowmaking – Using high‑pressure air to atomize water into microscopic droplets that freeze almost instantly, this technique produces a lighter, drier powder that skiers prefer. However, it demands the coldest conditions and consumes the most compressed air, making it expensive.

• “Hybrid” Air‑Steam Systems – By injecting a burst of steam into the airflow, these machines lower the required ambient temperature, allowing snow to be produced in marginally warmer conditions. Mammoth Mountain’s newest installation, as reported in the article, uses this hybrid system to push the snow‑making window from 5 pm to 7 pm, effectively doubling daily output.

• “Energy‑Recovery” Compressors – The Daily News references a pilot project at Big Bear that captures waste heat from the snow gun compressors to power a small solar‑thermal array. The result is a net‑zero energy use for the snow‑making operation, according to a 2025 report from the Sierra Club’s Climate Action Initiative.

3. Environmental and Regulatory Context

Artificial snow is a double‑edged sword. On the one hand, it saves jobs, boosts tourism, and preserves the economic vitality of the Sierra Nevada corridor. On the other, it draws on finite water resources and consumes large amounts of electricity. The Daily News explores this tension through a series of interviews and regulatory references:

• Water Rights – The California Water Commission’s “Ski Resort Water Allocation Rule” (enacted 2022) requires resorts to demonstrate that their snowmaking water usage does not impair downstream agricultural or ecological needs. The article shows how Mammoth Mountain obtained a 1.2‑million‑gallon “seasonal exemption” after submitting a water‑usage audit and a mitigation plan to protect local wetlands.

• Climate‑Adaptation Strategies – The Daily News links to the National Snow and Ice Data Center’s recent climate model projections, which predict a 15 % drop in average snowfall across the Sierra Nevada by 2050. Resort operators have responded by installing “green” snow‑making equipment and, in some cases, diversifying into other winter activities (e.g., zip‑lining, winter festivals) to reduce dependence on the snow‑dependent revenue stream.

• Energy‑Efficiency Mandates – California’s “Zero‑Emission Vehicle and Equipment Act” (2023) extends to high‑energy‑intensive equipment like snow guns. Resorts are now required to report their energy usage, and subsidies are available for retrofits to more efficient compressors. The article notes that Sierra at the Sierra has received a $500,000 grant from the state’s Energy Office to replace all 120 snow guns with new hybrid models.

4. The Human Side: Voices from the Slopes

Beyond the data, the Daily News paints a vivid picture of the people who keep the snowmaking process running. A feature interview with Sierra at the Sierra’s Chief Engineer, Maria Gonzales, reveals the logistical challenges of coordinating 70 guns across a 200‑acre run. “You’re essentially conducting an orchestra in the cold,” she says. She also stresses the importance of training local crews to troubleshoot equipment, especially as the technology continues to evolve.

A contrasting segment profiles a volunteer from the Sierra Club who has camped out for three days to study the water‑supply pipeline in Mammoth. She reports that the resort’s snow‑making operation is already “running 70 % of its capacity at peak hours,” and questions whether the current water‑right allocations will hold up under future drought scenarios.

5. Looking Forward: Can Snow be “Made” in a Warmer World?

The article closes on an optimistic, yet cautious note. The latest snow‑making technology can produce quality snow at temperatures up to 5 °F above freezing—much higher than the 0 °F threshold for older machines. This makes it possible for Southern California resorts to extend their seasons by a week or two, even during anomalously warm winters. However, the Daily News stresses that this is not a permanent solution. Climate models continue to show a steady decline in the length of the snow season and in overall water availability. Therefore, the industry is being pushed to pursue complementary strategies, such as building off‑season training facilities, investing in renewable energy for snow production, and advocating for stronger state‑wide water‑management policies.

Bottom Line

The Daily News article offers a comprehensive, science‑based look at how Southern California resorts keep their slopes covered in the face of an increasingly unpredictable climate. From the physics of water atomization to the regulatory hoops that must be cleared before each bucket of snow is poured, the piece shows that snowmaking is as much an engineering challenge as it is a business one. With technological innovations pushing the envelope of what is possible, the future of winter recreation in the mountains may well depend on how well these resorts can balance the art of snow production with the stewardship of limited water resources.