A volunteer network of precipitation reporters across Louisiana is collecting rainfall measurements that feed directly into national weather databases and climate research. These citizen scientists operate rain gauges as part of NASA's Community Collaborative Rain, Hail and Snow Network (CoCoRaHS), a program that has expanded weather observation beyond traditional meteorological stations.
The volunteers record daily precipitation totals using standardized measurement protocols. Their data streams into the National Weather Service and university research programs, where scientists use the readings to validate satellite observations and refine precipitation forecasting models. Louisiana's network has documented recent extreme rainfall events with ground-truth measurements that automated systems alone cannot capture.
CoCoRaHS launched in 1998 as a partnership between the University of Colorado and the National Center for Atmospheric Research. The program now coordinates tens of thousands of observers across the United States, Canada, and the Caribbean. Each volunteer maintains a simple rain gauge, typically a four-inch-diameter cylinder positioned in an open area away from structures and trees that could deflect falling water.
The data volunteers collect proves essential for understanding how climate patterns are shifting. Extreme precipitation events, including record-breaking rainfalls, occur with increasing frequency in Louisiana and across the Gulf Coast. Scientists need dense networks of ground observations to map rainfall intensity accurately and test whether climate models correctly predict these extremes.
NASA's participation in CoCoRaHS reflects the agency's emphasis on using ground networks to improve satellite-based Earth observations. The volunteers serve as ground-truth validators for precipitation measurements from space-based sensors aboard satellites like the Global Precipitation Measurement mission. When satellite and ground data align, confidence in precipitation forecasts increases. When they diverge, scientists investigate the discrepancies to improve both measurement systems.
The Louisiana volunteer observers represent one of thousands of citizen scientists contributing to NASA's broader Earth science mission. Their daily rain gauge readings, submitted through a simple online portal, have already contributed to studies