Rapid Update Cycle (RUC)
An integrated high-frequency model/assimilation system developed in coordination with NOAA/NCEP to support NWS, other components in NOAA, and the aviation community including FAA with accurate short-range forecasts based on latest hourly observations.
Rapid Refresh (RR)
Next-generation replacement for the (RUC), the Rapid Refresh (RR).
A next- generation coupled weather/air quality numerical prediction system based upon the Weather Research & Forecast (WRF) model. WRF-Chem has a large international user base and, in addition to studying global change processes, is used to predict weather, dispersion, and air quality.
Weather Research & Forecast Model (WRF) (external Web site)
A collaborative partnership to develop an advanced mesoscale forecast and assimilation
system, and accelerate research advances into operational forecasting.
Flow-following Finite-volume Icosahedral Model (FIM)
An initial version of a new global model including use of the adaptive isentropic-sigma hybrid vertical coordinate successful with the RUC model, accurate finite-volume horizontal advection, and use of an icosahedral horizontal grid.