Wednesday/ it’s going to rain

There is finally some rain on the way for Puget Sound, after a long stretch of dry weather. The meteorologists can see the systems approaching from way out west over the Pacific Ocean.

Below are some high-speed photographs of falling water drops, from an article published in 2009 by Emmanuel Villermaux. He wanted to study how big raindrops behave, as they make their way down to the ground. Raindrops of all sizes can come out of clouds, as the tiny drops (20 ┬Ám)┬ácombine to make bigger ones. But really big drops will flatten as they fall through the air, into little pancakes, then turn into little bags, and then break up altogether. So drops that reach the ground are at most 6 mm (0.25 in) in diameter. The terminal velocity of a rain drop is about 10 m/s (20 mph).

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