GEO 211 1st Edition Lecture 19Outline of Last Lecture I. Types of precipitationA. Falling drops must have diameter of 0.5mm (0.02 inch) or greater to be considered RainB. VirgaC. SnowD. SleetE. Freezing rainF. Ice stormsG. Snow pelletsH. HailOutline of Current Lecture II. Measuring precipitationA. Standard rain gaugeB. Tipping bucket rain gaugeC. Weighing gaugeIII. Measuring snowfallA. 2 measurements of rainfall1. Depth (with calibrated stick)2. Water equivalent (general ratio is 10:1)IV. Cloud seedingCurrent LectureII. Measuring precipitationA. Standard rain gauge- commonly used- Cross section= 10 times that of tube- Measurable amount= 0.01 inch OR greater- Less than 0.01 is reported as a traceB. Tipping bucket rain gauge- consists of 2 buckets These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Each time a bucket fills up with 0.01 inch of rain, it tips, sending an electric signal to the remote recorderC. Weighing gauge- collects rainfall in a cylinder that sits on a sensitive weighing platform- When cylinder fills up, electrical impulse is transmitted to a pen that records the dataIII. Measuring snowfallA. 2 measurements of rainfall1. Depth (with calibrated stick)2. Water equivalent (general ratio is 10:1)o Ex: 10 inches deep= 1 inch of rainfallIV. Cloud seeding- Silver iodide and dry ice are injected in a cloud to act as condensation nuclei- Works better in cold clouds with super cooled water- Silver iodide- commonly
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