How many times have you seen this scenario play out during the Monsoon: early afternoon, dark storm clouds move in your direction. Big lightning bolts, loud thunder, the sun fades fast. It seems inevitable that you’re going to get soaked. And then…nothing. Just a gray malaise & maybe a few drops of rain.
Welcome to the world of “anvil shading”. The video below explains how these high-based clouds are a Monsoon killjoy.