The largest known real-time, quality controlled 1-hour rain gauge dataset available in the United States and Canada
MetStat® has teamed with Synoptic Data Corp to create the largest known real-time, quality controlled 1-hour rain gauge dataset available in the United States. Reliable real-time acquisition protocols coupled with a multi-sensor QC algorithm produces a high-quality dataset of 1-hour rain gauge data. The QC’d gauge data and QC statistics provide the foundation for various hydrometeorological applications, including gauge-adjusted radar-estimated rain algorithms, identification of gauge malfunctions, alert notifications of rainfall intensities that meet/exceed thresholds, detailed post-event analyses and climatological studies. Gauges can suffer from a number of different problems including freezing rain, windy conditions, gauge siting (e.g., obstructions around the gauge), under-measurement by tipping bucket gauges in high intensity rainfall, and gauge maintenance, therefore making QC an imperative step before utilizing the data.The QC system repeatedly (6x) processes data for each hour in order to capture all available gauge data and leverage increasingly rich independent datasets that have varying latencies.The complexities of gauge QC often prevent a binary (correct or not correct) decision to be made, therefore a QC confidence flag is computed for each measured value. Ranging from 0 to 1, the QC confidence flag provides an objective measure of how well the value compares to independent, multi-sensor datasets. The multi-sensor QC algorithm is based on surrounding gauges, radar reflectivity data, National Weather Service Stage IV gauge-adjusted radar-estimated rain data and satellite-estimated rain data.
Data from over 20,000 stations are accessed, QC’d and archived each hour. Real-time rain gauge data are accessed from a variety of real-time sources, but largely from MesoWest, which aggregates weather observations from government and non-government gauge networks. Strategic alliances with other data providers allow unique and exclusive access to data sources that are otherwise difficult to attain. Pooled data from the increasing number of sources makes this the largest known real-time, QC’d rain dataset available in the United States. Currently, 1-hour rain data are acquired from the following sources: