Floods are a prime example. All the raindrops are collected in small quantities, channelled into streams or roadside drains. These flow into rivers and storm drains which eventually merge with other rivers and storm drains.
The drops by themselves seem insignificant when viewed in isolation. Exposure to the convergence of the entire mass is overwhelming.
Often times we do not realise the significance of the isolated showers we experience. The connection here, proposal there, small contract with an acquaintance, speaking opportunity at a minor event all eventually end up in the river. When the rivers finally meet, you experience the full power of the convergence.
It might come sometime after the rain, perhaps even at a location downstream, untouched by the showers. One thing is certain. All water makes it’s way back to the sea.