>>24160820
It called cloud seeding.
Cloud seeding is a weather modification technique that enhances a cloud's ability to produce rain or snow by introducing tiny particles, like silver iodide or dry ice, into it, acting as ice nuclei for water vapor to condense and form precipitation. It's used globally for increasing water supplies, boosting snowfall for water storage, dispersing fog, and suppressing hail, but raises concerns about environmental impacts and effectiveness.
How it works
Introduction of Nuclei: Substances like silver iodide (AgI) or dry ice (frozen CO2) are dispersed into clouds, often from aircraft or ground generators.
Condensation/Freezing: These particles provide surfaces for supercooled water droplets to freeze or for moisture to condense around, creating ice crystals or larger water droplets.
Precipitation: As these droplets or crystals grow, they become heavy enough to fall as rain or snow.
Common uses
Water Supply: Increasing precipitation in drought-stricken areas or for mountain snowpack.
Fog Dispersal: Clearing fog at airports.
Hail Suppression: Reducing hail damage to crops.
Wildfire Support: Potentially fighting forest fires.
Common agents
Silver Iodide (AgI): Most common, mimics natural ice nuclei.
Dry Ice (CO2): Causes rapid cooling, inducing freezing.
Hygroscopic Materials: Such as salt (NaCl, CaCl2) to attract moisture.