 Other observations in Hurricanes Anita , David , Frederic , and Allen also discovered that tropical cyclones have very little supercooled water and a great deal of ice crystals . The reason that tropical cyclones have little supercooled water is that the updrafts within such a system are too weak to prevent water from either falling as rain or freezing . As cloud seeding needed supercooled water to function , the lack of supercooled water meant that seeding would have no effect . 
