I am getting many inquiries about weather modification -- from email to Twitter  (as with the item below)  and I'd like to clear the air a bit. Please read my qualifications at the bottom.  Snow Increases There is one area in which weather modification in which mild success is documented.  In mountainous areas during winter, silver iodide generators can put that (not harmful) chemical into low-lying clouds and increase the amount of snow 5 to 15% over what would have fallen anyway. The qualification is because if nothing would have fallen anyway, weather modification cannot do any good. The illustration above is incorrect in that the mountains need to be in the clouds or almost in them.  Hail Suppression In the summer, especially in the High Plains of the U.S., and in other parts of the world, there have been efforts to suppress hail to limit crop damage with the added benefit of limiting damage to buildings, et cetera.  For hail suppression, aircraft ...