Thus, each inch in the tube is equivalent to 0.1 inches (a tenth of an inch) of rainfall. The inner tube’s diameter is just small enough to make the depth of rain ten times what it would be in a gauge without the tube and funnel. It has a funnel that deposits rain into an inner tube with a smaller diameter (like this one), but bigger. The gauge is the same type the National Weather Service uses. It’s also about the many possible sources of error when making rain measurements – from old rain gauges to growing trees and even, possibly, inquisitive raccoons.īy Monday morning (September 16), I had measured over 16 inches in our backyard rain gauge from the storm which began September 10. This is the story of my attempts to measure rain during the storm. Which brings us to the questions - How do you measure rain? And how accurate are the measurements? Even though I have done weather research for many years, during this storm I was reminded how hard it is to measure rain accurately. In early September of 2013, the Boulder, Colorado, area had huge amounts of rain. Peggy LeMone is an NCAR Senior Scientist who studies weather and cloud formation.
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