This metadata record serves as documentation for the authoritative version of the CONUS404 pseudo-global warming (PGW) atmospheric forcing dataset. This dataset covers a future-perturbed 42-year period (water years 1980-2021, October 1, 1979 - September 30, 2021) and has sufficient temporal and spatial detail to resolve probable mesoscale atmospheric states and processes in a future warmer climate, making it appropriate for forcing hydrological models and conducting meteorological analyses to study one possible scenario of climate changes and resultant hydrologic impacts over the conterminous United States (CONUS). The dataset is the output of the Weather Research and Forecasting (WRF) v 3.9.1.1 model (Skamarock and others, 2008), forced with ERA5 reanalysis data (Hersbach and others, 2020) plus LENS2 projected climate perturbations (Rodgers and others, 2021), and consists of time series of nearly 200 2-dimensional variables and a wide range of 3-dimensional variables. Please refer to the Supplemental Information element of this metadata record for further information on CONUS404 PGW.