On Aug. 23, a California company called Rainmaker Technology Corporation launched a drone near the head of Kachemak Bay and flew it into clouds cold enough to contain supercooled water. The drone released less than 1 pound of silver iodide. Rainmaker says the experiment coaxed about 19 million gallons of additional precipitation from those clouds over three hours.
That sounds dramatic. It wasn’t. Spread over roughly 100 square miles, 19 million gallons amounts to about one-hundredth of an inch of rain. If you had been standing underneath it, you might have noticed a drizzle. You also might have continued mowing the lawn.
Given the collective social media freakout, you’d be forgiven for thinking Rainmaker had pointed a weather-controlling laser beam right at Homer and hit “deploy” from a top-secret mission control bunker.
The experiment produced an impressive online meltdown after residents and local elected officials discovered it had happened without much advance notice. State Rep. Sarah Vance called on Rainmaker to cease operations in her district. Kenai Peninsula Borough Mayor Peter Micciche raised questions about why local residents weren’t informed. Social media did what social media does whenever the words “weather modification” appear together. Cue the chemtrail conspiracy theorists.
Cloud seeding isn’t science fiction, and it certainly isn’t a secret government plot. Scientists have experimented with it since the 1940s. The basic idea isn’t especially difficult to understand.
Some cold clouds contain tiny droplets of water that remain liquid even below freezing. Introduce particles such as silver iodide, whose structure helps ice crystals form, and some of those droplets freeze, grow and become heavy enough to fall as snow or rain. Some. That is the key word there.
Cloud seeding can’t manufacture a thunderstorm over a cloudless desert; it can’t steer hurricanes; and it can’t turn a passing cloud into Noah’s flood. It can, however, give the right kind of existing cloud a little nudge of inclement encouragement.
Research has become considerably more sophisticated, too. The 2017 SNOWIE experiment in Idaho demonstrated that scientists could detect and measure precipitation produced by silver iodide seeding under the right conditions.
Now, that doesn’t mean every question has been answered. A 2024 Government Accountability Office review found that studies estimated cloud seeding can increase precipitation anywhere from zero to 20%, depending on conditions, and said more research is needed to understand when it works best. The GAO also found that existing research suggests the amounts of silver iodide currently used do not pose an environmental or human health concern, while noting that the effects of much more widespread use aren’t as well understood.
In other words: We need to do more science, and Alaska is a pretty good place to do it.
Rainmaker came here because cloud seeding requires particular atmospheric conditions, including clouds cold enough for the process to work, which Alaska has. The potential applications extend far beyond producing an August drizzle near Homer.
Western states are staring at increasingly serious water problems. Reservoirs and rivers supplying farms, cities and hydroelectric projects are under pressure. Snowpack is, in effect, nature’s water-storage system. Even squeezing a few additional percentage points of precipitation from suitable clouds could matter enormously when repeated across the right watersheds.
Cloud seeding won’t solve climate change or replace conservation efforts, but if better engineering can help put more snow on mountains and more water into reservoirs, we should be rooting for the scientists trying to figure out how.
That brings us to the one part that beckons reasonable criticism.
Rainmaker says it notified the Alaska Department of Natural Resources before the test. DNR determined the drone research was a generally allowed use of state land, but the department says it has no jurisdiction over cloud seeding itself. The Department of Environmental Conservation is now reviewing what happened.
That’s a little bit of an awkward gap but despite the naive handwringing by elected officials, we shouldn’t be falling all over ourselves to make new laws here. Alaska doesn’t need to construct a regulatory fortress around every weather balloon, drone or scientific experiment, nor should every experiment become subject to the whims of pitchfork-carrying mobs at a town hall. Scientific questions aren’t settled by whoever draws the angriest crowd, and that needs to be balanced with residents knowing what’s happening in their communities — or, in this case, over their communities.
The state should consider a simple notification and oversight process. Tell local governments when these types of experiments are planned, and make information about the chemicals, quantities and science readily available. But any public process must not be allowed to be hijacked by petty naysayers.
Sunlight, as they say, is the best disinfectant — even when we’re talking about making clouds. Then let the scientists do their science-y thing. Too often, good projects or experiments are derailed by irrational conspiracy theories shouted at public meetings (or by elected officials) and the result is that we don’t move forward. That’s a bad outcome any way you slice it.
