Rapid Update Cycle

related topics
{island, water, area}
{system, computer, user}
{math, energy, light}
{rate, high, increase}
{ship, engine, design}
{service, military, aircraft}
{war, force, army}

The Rapid Update Cycle (RUC) is an atmospheric prediction system that consists primarily of a numerical forecast model and an analysis system to initialize the model.

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. 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).

The RUC runs 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. This update frequency is still only once an hour (the standard interval for ASOS observation reporting), and with current computational limitations and the time required to assimilate all of the data, there is approximately an hour delay in producing the forecasts. Because of this, it is common practice to use a one-hour forecast from the RUC as a current analysis, as the one-hour forecast comes out only a few minutes before the time it is forecasting for. There is also little possibility for error in a one-hour forecast, meaning that the RUC's one-hour forecast will not usually vary greatly from the actual state of the atmosphere at that particular point in time.

The RUC is scheduled to be replaced by the Rapid Refresh (RR) model, based on the WRF, in summer 2011.[1]

References

External links

  • NCEP RUC Homepage - Includes forecast output images and descriptions of the diagnostic variables available from the model output.


Full article ▸

related documents
Oceanus Procellarum
Endeavour River National Park
Mississippian
Geography of Liechtenstein
Guadalquivir
Soay, Skye
South Island National Park
Errinundra National Park
Geography of Anguilla
Bridalveil Fall (Yosemite)
Paleomap
Geography of Tanzania
Cocoparra National Park
Geography of Andorra
Tarra-Bulga National Park
Lihou
Alaska Interior
10th millennium BC
Bering Island
Sénégal River
Girraween National Park
Little Cumbrae
Alfred National Park
Leeuwin-Naturaliste National Park
Phantom island
Geography of Taiwan
Purnululu National Park
Anadyr River
Horse latitudes
Lac de Guiers