Reclamation Information Sharing Environment (RISE)

The wxgenR project developed a modern, open-source stochastic weather generator to support Reclamation’s climate change adaptation and planning studies. wxgenR integrates seasonality directly into daily precipitation and temperature simulation, improving representation of key hydroclimate patterns such as monsoons and snowmelt timing. The tool uses a non-homogeneous Markov chain framework with seasonal covariates and is implemented as an R package, publicly released on CRAN. Validation at multiple U.S. sites demonstrated strong performance in reproducing precipitation and temperature statistics. The methods, algorithms, and validation results are documented in the attached peer-reviewed manuscript (Woodson et al. 2025). This report provides background context, outlines Reclamation applications, and documents data archiving and dissemination activities for project closeout.