Correction Coefficients for 16" and 18" Rain Gauges in High Wind Events

Precipitation is a notoriously difficult parameter to measure accurately, however it is crucial to proper reporting of rainfall for use in weather reports, agriculture, private industry, and more. One of the variables that complicates accurate precipitation measurements is wind speed. High wind speeds can blow precipitation away from rain measurement gauges and cause bias in precipitation reporting. Various methods have been used throughout the years to try to combat this, from different types of wind shields to unique funnel designs on the gauges themselves. However, many of these designs still leave room for improvement. One practical way to improve the accuracy of measurements is with correction coefficients tailored to a specific rain gauge. This study will explore data from a field site that regularly experiences high wind events. Using statistical analysis of data from a Double Fence Intercomparison Reference (DFIR) at the site and comparing it to data from a 16” single altar (SA) and an 18” SA rain gauge at the same field site, the goal is to create a new correction coefficient that would be used to correct bias from wind-blown precipitation and improve the accuracy of the 16” and 18” gauges during high wind events. The results from this study could be used to increase overall accuracy in precipitation reporting and lay the foundation for improvements on other types of rain gauges as well.