Rapid Refresh
The Rapid Refresh (RR or RAP) is a numerical weather prediction model. The model is designed to provide short-range hourly weather forecasts for North America. The Rapid Refresh was officially made operational on May 1, 2012, replacing the Rapid Update Cycle (RUC).
The Rapid Refresh is run at the National Centers for Environmental Prediction. It is based on the framework of the Weather Research and Forecasting model; the Global Forecast System provides the boundary parameters. The grid points are spaced every 13 kilometers, with 50 vertical intervals extending up to the 10-hectopascal level of the atmosphere. The model runs once each hour, with forecasts given hourly out to 18 hours.
An experimental version of the Rapid Refresh runs at the Earth System Research Laboratory. This version uses more modern model framework and also has a higher-resolution mode, the High-Resolution Rapid Refresh (HRRR), that uses a 3 kilometer grid spacing and gives forecasts in 15-minute intervals (though still only issued once an hour).
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