A closer look
It sounds like terrible sci-fi, but massive flying rivers are currently hovering above your head. The Pineapple Express is a localized conveyor belt of intense moisture stretching from Hawaii to California. But the water vapor alone isn't enough to cause a superstorm; it needs a microscopic skeleton. At the microphysical level, atmospheric rivers rely on tiny aerosols—dust blown in from deserts, or sea salt whipped up from the waves. Water vapor aggressively clings to these invisible floating seeds, instantly freezing and colliding to form raindrops so massive they trigger devastating billion-dollar floods upon landfall.
