Rain Enhancement Technologies Reports Preliminary Warm-Season WETA Results in Utah
Rain Enhancement Technologies said preliminary analysis showed more than 20% precipitation enhancement at its La Sal Mountains deployment during April through July 2026.
Rain Enhancement Technologies Holdco, Inc. (NASDAQ:RAIN) has reported preliminary warm-season analysis from its WETA deployment near Utah’s La Sal Mountains. The company estimates that precipitation at the La Sal Upper monitoring station was enhanced by more than 20% from April through July 2026 compared with the amount the site was expected to receive without the system.
The analysis covered the spring and summer period and followed the company’s previously reported winter 2025-26 assessment at the same location. RET said the findings remain preliminary and that additional seasons of data will be monitored.
The La Sal Upper station recorded 9.90 inches of precipitation between April and July 2026. RET’s two statistical models each attributed more than 2 inches of that amount to the WETA’s estimated effect.
The estimated probability of a positive effect was 97% using ridge regression and 82% using Bayesian Structural Time Series, or BSTS. Both methods produced a positive estimate for each month, although RET said monthly results carry more uncertainty than the seasonal calculation.
RET’s science team used a counterfactual analysis to estimate how much precipitation the La Sal site might have received without the array. The models were trained using historical precipitation relationships between the La Sal Mountains and two control stations in the Abajo Mountains, approximately 40 miles to the south.
The Abajo stations experience the same storm systems but are outside the WETA’s area of influence. Observations from those stations during the operating period were then used to create an estimate for La Sal, which was compared with the precipitation actually recorded there.
The four monitoring locations are part of the U.S. Department of Agriculture’s Natural Resources Conservation Service SNOTEL, or Snow Telemetry, network. RET used ridge regression and BSTS as separate methods for evaluating the results.
The WETA array is installed on Flat Iron Mesa, several miles inside San Juan County, Utah, near the La Sal Mountains. Its stated area of influence extends across portions of San Juan and Grand counties. During precipitation events, prevailing southwest winds carry ions from the array northeast toward the mountain range.
RET describes WETA as a ground-based, solar-powered and chemical-free system designed to operate autonomously year-round. The company distinguishes it from conventional cloud seeding, which generally relies on sub-freezing conditions and aircraft or chemical dispersal.
RET suspended WETA operations during National Weather Service flood warnings in the region in August and September 2026. Because the array operated for only part of those months, the company excluded them from the reported analysis.
The company said it will continue monitoring the La Sal deployment and report further results as additional seasons of data become available. No specific timing was provided for the next update.
RET said its warm-season assessment follows winter 2025-26 findings in which the company estimated more than 20% enhancement in snow water equivalent at the same site during a historically dry winter.
The company characterised the two periods as indicating an effect beyond the snow season, while continuing to describe the warm-season analysis as preliminary. RET also noted that its statements about the significance and future implications of the technology are subject to assumptions, risks and uncertainties, and are not predictions of actual performance.
RET’s preliminary analysis estimated more than 20% precipitation enhancement at the La Sal Upper station from April through July 2026.
The station recorded 9.90 inches of precipitation, with both models attributing more than 2 inches to enhancement.
The estimated probability of a positive effect was 97% under ridge regression and 82% under BSTS.
August and September 2026 were excluded because WETA operations were suspended during National Weather Service flood warnings and the array operated for only part of those months.
RET plans to continue monitoring the La Sal deployment and report further results as additional seasons of data become available.
Rain Enhancement Technologies Holdco, Inc. announced preliminary warm-season results from its WETA deployment in Utah’s La Sal Mountains. Its analysis estimated more than 20% precipitation enhancement at the La Sal Upper monitoring station compared with what the site would have been expected to receive without the WETA.
The results cover precipitation recorded from April through July 2026 at the La Sal Upper monitoring station. Rain Enhancement Technologies Holdco, Inc. excluded August and September 2026 because WETA operations were suspended during National Weather Service flood warnings and the array operated for only part of those months.
Rain Enhancement Technologies Holdco, Inc. estimated more than 20% enhancement during the April through July 2026 period. The La Sal Upper station recorded 9.90 inches of precipitation, and both statistical models attributed more than 2 inches of that total to enhancement.
Both models placed the probability of a positive WETA effect above 80%. The estimated probability was 97% under the ridge regression model and 82% under the Bayesian Structural Time Series model.
Rain Enhancement Technologies Holdco, Inc. used ridge regression and Bayesian Structural Time Series, or BSTS. The company used the methods to compare observed La Sal precipitation with an estimate of what the site would have received without the WETA.
Rain Enhancement Technologies Holdco, Inc.’s science team trained statistical models on the historical relationship between precipitation in the La Sal Mountains and two control stations in the Abajo Mountains, approximately 40 miles to the south. The models then used observed Abajo data during the operating period to estimate La Sal precipitation without the WETA and compared that estimate with the measured result.
Rain Enhancement Technologies Holdco, Inc. said the results are preliminary and that month-by-month estimates carry more uncertainty than the seasonal total. Both models estimated a positive effect in each month, but the company said it was presenting the findings conservatively and would assess additional seasons as more data became available.
Rain Enhancement Technologies Holdco, Inc. said the warm-season results followed previously reported winter 2025-26 findings, in which its analysis estimated more than 20% enhancement in snow water equivalent at the same site. The company said the two periods indicate that the WETA’s effect extends beyond snow season into the spring and summer months, while describing the warm-season findings as preliminary.
The WETA array is installed on Flat Iron Mesa, several miles inside San Juan County, Utah, near the La Sal Mountains, with an area of influence extending across portions of San Juan and Grand counties. During precipitation events, prevailing southwest winds carry the array’s ions northeast towards the range.
Rain Enhancement Technologies Holdco, Inc. describes the WETA as a ground-based, solar-powered and chemical-free system that operates autonomously year-round. Unlike conventional cloud seeding, the company says the system does not generally depend on sub-freezing conditions, aircraft or chemical dispersal.
Rain Enhancement Technologies Holdco, Inc. develops, manufactures and commercialises ionisation precipitation generation technology intended to enhance rainfall and snowpack. The company is also developing applications for fog mitigation and says its technology is intended to address water scarcity challenges.
Rain Enhancement Technologies Holdco, Inc. identifies its shares as trading on NASDAQ under the ticker symbol RAIN.
Rain Enhancement Technologies Holdco, Inc. said it will continue to monitor the La Sal deployment and report additional results as further seasons of data become available. The company did not provide a specific date for the next update.