Using only pure water and controlling the size of the droplets released under turbulence within cumulus clouds, we promote the vertical growth of the seeded cloud. It is possible to visualize rainfall precipitation within 20 to 40 minutes of the seeding.

Project in the Chapada Diamantina
Seeding Example: Project in the Chapada Diamantina - March 2009

The droplets released inside the cloud grow by colliding with other water participles as they are carried upwards by the updrafts. When their weight is enough to overcome the updraft they begin to fall. These droplets continue to grow by colliding head-on with other smaller droplets that are rising, thus gaining even more weight and size to form actual raindrops.

Technology Modclima

The amount of precipitation depends on weather conditions and the size of the seeded cloud. In past projects we have measured artificially induced precipitation of up to 60 mm, but more commonly between 5 and 40 mm.

The technology does not use any type of chemical. The process is based entirely on physics, involving thermodynamics and heat transfer principles, in the same way it occurs in the natural development of the cloud. Our technology accelerates the process of cloud growth and precipitation in a given target area, giving us control over the timing and location of the rainfall.

In addition, the moisture that reaches the soil returns to the atmosphere through evaporation and plant-transpiration, creating weather conditions (humidity) for the emergence of new "seedable" clouds and other natural rainfall. Thus our technology also noticeably improves the natural hydrological cycle of the project region.

Chuva Induzida

Learn more about our technology. Watch our videos of localized rain induction:

ModClima registers and compiles records and reports of its work to support its technology and results.

Water Supply

For our main client SABESP, our technology is used as a tool to help secure the water supply for the city of Sao Paulo, and as a new way to mitigate the effects of climate change and combat drought.


These projects focus on mitigating the effects of droughts on agriculture crops. In these situations, the use of the technology can become part of a preventive strategy to deal with more frequent events of droughts in productive areas.


Protecting out biodiversity and preventing forest fires.