Rapid Refresh (RAP)
The Rapid Refresh (RAP) is an hourly updated weather forecast model/assimilation system, which went into operation on May 1, 2012, at the National Centers for Environmental Prediction (NCEP) as NOAA's hourly updated model. RAP version 2, a major upgrade, was implemented at NCEP on February 25, 2014.
Scientists from the Earth System Research Laboratory's, Global Sciences Division work with colleagues from NCEP, the National Center for Atmospheric Research, and other labs on RAP development.
The High-Resolution Rapid Refresh (HRRR) is a NOAA real-time 3-km resolution, hourly updated, cloud-resolving atmospheric model. The NCEP HRRR has been operational since September 30, 2014.