It’s Raining Cats and Dogs
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Rainfall is measured in terms of millimeters or inches, and, depending on the amount that has fallen, is usually described as light, moderate or heavy rain. It is said to be light rain if the amount totals one tenth of an inch of rainfall per hour. This type of rain is only a sprinkle, and doesn’t get you very wet if you get caught in it. You definitely wouldn’t need a raincoat during light rain. During a moderate rain shower, you would probably get wet if you spent even a short amount of time outside. You would definitely need a raincoat or umbrella to keep the water off your clothes and hair. Moderate rainfall measures from one tenth to one third of an inch of rain in an hour. Meteorologists call it heavy rain if more than a third of an inch of rain falls in an hour. The term, “it’s raining cats and dogs” applies here because there is nothing like a heavy shower to make you run for cover, and fast.
A simple rain gauge is a low-tech method of getting a rainfall measurement and all that is required is a container, such as a cylinder with a flat bottom and straight sides. While this type of container can help you gauge whether it was raining cats and dogs, it is very difficult to measure small amounts of precipitation this way.
A tipping bucket records precipitation on a rotating drum or electronically. A simple rain gauge has a funnel, but the funnel leads to two tiny buckets. The buckets are balanced similarly to a see-saw and each holds one-hundredth of an inch of water. When one bucket fills up, it tips down and is emptied as the other bucket fills with precipitation. Each tip of the bucket causes the rotating drum to record an increase of one-hundredth of an inch of rain. This method is not for when it’s raining cats and dogs.
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