posted on Sep, 14 2009 @ 06:26 PM
Cloud seeding technology has been used for decades and was used by China during the Beijing Olympics. There have been trials in tasmania and
queensland is supposedly now trialing it.
Regardless, you can put as many aerosoles or cloud condensation nuclei in the atmosphere as you like, but if there is no moisture or not enough, and
if you have no lifting mechanism, you won't get clouds.
To form clouds, and ultimately rain (precipitation), we need:-
- Cloud Condensation Nuclei (CCN)
- Uplift of air – create cooled air to reach saturation (or supersaturation)
Vertical uplift of moist air results in cooling and condensation (depending on amount of moisture in air). Several mechanisms to cause uplift and
Cloud droplets (ice particles) are formed when water vapour condenses around a cloud condensation nuclei, (e.g., sand, smoke, salt or dust) to form a
large cloud drop.
Unless Nasa is working on these fundamental basics then they are not making clouds to create rain.