An experimental High Resolution Rapid Refresh (HRRR) ran by the Earth System Research Laboratory (ESRL) offers 3 km (1.9 mi) resolution at 15-minute intervals A backup version of the RUC continued to run until that too was stopped on May 15, 2013, thus formally bringing an end to the model. Like the RUC, the Rapid Refresh model also runs hourly out to 18 hours on a 13 km (8.1 mi) grid spacing, but also covers a wider area. The RUC was decommissioned on it was replaced by the Rapid Refresh (RR or RAP) model, based on the WRF. There is also little possibility for error in a one-hour forecast, meaning that the RUC's one-hour forecast would not usually vary greatly from the actual state of the atmosphere at that particular point in time. Because of this, it was common practice to use a one-hour forecast from the RUC as a current analysis, as the one-hour forecast would come out only a few minutes before the time it is forecasting for.
ICYCLE R8UC UPDATE
This update frequency was only once an hour (the standard interval for ASOS observation reporting), and with computational limitations and the time required to assimilate all of the data, there is approximately a one-hour delay in producing the forecasts. The RUC ran at the highest frequency of any forecast model at the National Centers for Environmental Prediction (NCEP), assimilating recent observations to provide very high frequency updates of current conditions and short-range forecasts. Significant weather forecasting problems that occur in the 0- to 12-hr range include severe weather in all seasons (for example, tornadoes, thunderstorms, snow, and ice storms) and hazards to aviation (for example, clear air turbulence, icing, and downbursts). Assessment of the 60 Km Rapid Update Cycle (RUC) with Near Real-Time Aircraft Reports NASA is developing the Center-TBACON Advisory System (CTAS), a set of Air Traffic Management (ATM) Decision Support Tools (DST) to enable controllers to increase airspace capacity and flight efficiency. The RUC was designed to provide accurate short-range (0- to 12-hr, later expanded to 18-hr in 2010) numerical forecast guidance for weather-sensitive users, such as those in the aviation community. Graphical 12-hour forecast output from RUC2
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