Utah, USA
#00217
Case study of
#00202 Cloud seeding to enhance precipitation (unproven at decision-relevant scale)
Implementer
Utah Division of Water Resources with contracted seeding operators
Location
Description
Utah has run a statewide winter cloud seeding program since the 1970s, operated by the Utah Division of Water Resources with contracted seeding operators, and expanded funding substantially in 2023 amid Colorado River shortage anxiety. The program claims 5–15% precipitation increases, but the US GAO review (December 2024/January 2025) found estimated effects of such programs are often statistically indistinguishable from zero given natural precipitation variability. The SNOWIE experiment quantified real but modest event-level snowfall from seeding, which is not the same as a demonstrated drought-scale yield. Nine US states run similar programs. Tennessee banned cloud seeding outright in 2024 amid conspiracy backlash following the Dubai floods. For operational scale comparison, the UAE flew 311 seeding missions in 2023.
Metrics
4Funding
Lessons learned
- Decades of operation have not produced decision-grade evidence: program-scale claims of 5–15% precipitation increase remain statistically unverifiable per GAO.
- Event-level physics (SNOWIE experiment) proving modest snowfall increases is not equivalent to a drought-scale water yield — these are routinely conflated in budget debates.
- Weather modification attracts acute political risk in both directions: easy to fund during drought years, but Tennessee banned it entirely in 2024 following conspiracy backlash.
Documented Jul 24, 2026