admin /3 July, 2006
Raindrops come in all sizes, says The Australian (3/7/06. p.10). Big, plump drops from thunderstorms may have diameters from 5mm to 8mm, but more typical raindrops range in diameter from about 1mm to 2mm.
Drops unite: Big or small, raindrops form from melting snow flakes or hail stones and when smaller drops called cloud drops collide and unite to form one mass.
Claim smoke reduces rainfall: In 1999 Hebrew University cloud physicist Daniel Rosenfeld published the first satellite data, based on optical, infrared and radar observations, showing that smoke reduces rainfall because it increases the number of tiny particles in a cloud.
Small pollution particles have similar effect: In 2000, using similar satellite data, he revealed that the small particles from urban and industrial pollution in Turkey, Canada and eastern Australia also reduce rainfall.
Cloud seeding could help "kick start" rain: The implications are that cloud seeding may help restore rainfall from polluted clouds or those that just need a "kick start".
The Australian, 3/7/2006, p. 10
Source: Erisk Net