HIRESW- HIgh RESolution Window – The HiresWindow is a dual-core modeling system run at 2.5, 3km and 5 km horizontal spacing and without parameterized convection. There are three main versions: the WRF-ARW, WRF-ARWMEM2, and the HIRESW-FV3 (Finite Volume Cubed)
The dual core refers to the two main dynamical cores: the Weather Research and Forecasting (WRF) and the Advanced Research Weather (ARW) (combined as WRF-ARW).
There’s a also limited area configuration of the Finite Volume Cubed Sphere (FV3) core.
The primary HIRESW-ARW runs for the continental US and uses the Rapid Refresh (RAP) model for initial conditions, and the Global Forecast System (GFS) for lateral boundary conditions. The HIRESW-ARW is available in 5 km horizontal resolutions. (There are also models for Puerto Rico, Alaska and Guam run at 3km. )
(There’s also a very high resolution limited subset of the HIRESW-ARW, the HIRESW-2P5, which has a resolution of 2.5 kilometers.)
The second version, the HIRESW-ARW-MEM2 uses slightly different modeling physics which shows itself as different precipitation forecasts.
The third version, FV3 core model— the HIRESW-FV3 is initialized by interpolation of the GFS model output to generate initial and lateral boundary conditions.