For years, scientists have been confused by the effect that solar eclipses have on clouds. Not all clouds, mind you. But, whenever a solar eclipse happens, and the sun is obscured even just 15 percent by the moon, cumulus clouds seem to vanish.
As such, with fewer clouds in the sky, more of the sun's heat would actually make it down to Earth, increasing global temperatures. So why exactly does this happen, though? Based on simulations designed to determine a solar eclipse's effect on certain clouds, scientists believe it has to do with the ground cooling. When the sun is blocked, the ground cools, thus creating updrafts.