ADAS Description

ADAS, the ARPS Data Analysis System, is a 3-dimensional weather analysis program. This implementation is using Rapid Update Cycle (RUC) forecasts from the National Center for Environmental Prediction (NCEP) as background fields. Oklahoma Mesonet , surface airways, NOAA wind profiler , and radiosonde data are used in the analysis. The analysis method is a successive correction scheme known as the Bratseth method [Tellus, 1986]. This method is designed to asymptotically approach the result of a statistical (optimal) interpolation. The analysis grid has resolution of 9 km in the horizontal and is stretched in the vertical from about 10 m near the ground to nearly 1 km near the top. The analysis is run hourly on an IBM RS/6000 Power workstation on a timed queue and the WWW products are generally available by 30 minutes after each hour. However, due to the varying load on the machine, that performance cannot be guaranteed.

For further technical description of ADAS click here.

ADAS is the initial step in a multiple-step analysis/assimilation procedure using mutiple data sources, including Doppler radar winds, to initialize a model for short-term forecasts of thunderstorms and other small-scale weather features.

Related Pages

  • Technical Description of ADAS
  • Description of ADAS Plotted Variables
  • The Advanced Regional Prediction System (ARPS)
  • ARPS real-time forecasts
  • Oklahoma Weather Roundup.
  • Center for Analysis and Prediction of Storms
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    Comments or problems? email Keith Brewster