Useless dinner table trivia -
RaindropsThe National Weather Service has declared a flood watch for my part of the state because they're predicting anywhere from one to four inches of rain within the next 12 hours.
One to FOUR?! What kind of range is that?!!!!!!!
Fully expecting to have to bail out the swimming pool that is the floor of my basement AGAIN, I thought I would pass along some useless trivia while I watch the rain begin to fall.
The upper limit for the diameter of a raindrop is about 8 mm, 1/3 of an inch. Most drops are much smaller than that upper limit. If you've been hit by anything bigger than that it may have been something dripping off of an overhanging telephone/electrical line, tree branch or from the back end of a passing bird. Check the color.
Drops can't get any larger because of friction with the air as they fall through the atmosphere. That friction would tear the drop apart into smaller pieces until that optimum size is reached.
Raindrops aren't teardrop shapes. They're round, wee orbs. Perfect, tiny spheres and that's why they can produce rainbows if lit from the right angle and refract the light just so. If you can see a rainbow, look closer. You may be able to see the secondary rainbow that runs over the top of the first and in reverse color. Roy G. Biv is Vib Gyor. Not nearly as poetic but no less cool to see.

Lastly, all rain starts as frozen precip in the clouds. It'll melt on its way to the ground as it passes through warmer air. Rain in the summer will still feel cool to the skin because it was only just recently a pellet of ice or a flake of snow. If it bounces around enough times in the clouds before it makes its way to the ground it can actually build into a mighty impressively sized hailstone. Right now, the largest recorded hailstone on record with NOAA is a seven inch monster with a circumference of 18.75 inches. Hope that puppy didn't hit a car cause "Act of God" isn't covered in most insurance policies.