Aerosols affect development of clouds and precipitation by serving as cloud condensation nuclei (CCN) ice (IN). Considering the dramatically changing ambient aerosol concentration, it is important to examine potential “side effect” pollution on enhancement weather modification. In this study, seeding was performed a event in Beijing summer 2008, which simulated NSSL two-moment scheme Weather Re...

Computations of power of re-randomization tests by exact methods are known to be computationally exhorbitant. We introduce a much cheaper "naive" method of evaluating power and show both by simulation and analytically for a special case that it very mildly overestimates true power. We further derive a normal approximation to re-randomization distributions of linear statistics and illustrate its...

The Wyoming Weather Modification Pilot Program (WWMPP) is funded by the State of Wyoming through the Wyoming Water Development Commission (WWDC), and is unique among statesponsored programs in the USA in that it includes a substantial evaluation component. The main purposes of the WWMPP are to establish an orographic cloud seeding program in three target areas (the Medicine Bow Range, Sierra Ma...