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The MRF/GDAS Pre-Implementation test
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    "Prior to the implementation of the new Global Data Assimilation System (GDAS) and the new Medium-range Forecast Model (MRF86) on May 30th of this year, a shakedown evaluation was done using a real-time system, run in parallel to the previously operational data assimilation system and medium-range forecast model (MRF85). Additionally, a set of experimental 5- day forecasts were produced using the MRF86 based on initial conditions taken from the summer of 1985; also available was a comparative 30-day integration for a Dec. 85 data set. This paper reports the results of the evaluation and outlines some of the additional development work needed to make improvements to the new system within the next few months. During the previous year, the basic components of the new systems were individually evaluated with generally positive results, but some facets of the system were not examined in the detail a conservative approach would require. The shakedown, or pre-implementation, test served as an opportunity to determine if it was safe to proceed with operational implementation. It is clear that the decision to implement the new systems was based on an overall favorable outcome of the tests. We are nonetheless aware of several aspects of the system which need further work, and these areas are included in the subsequent discussion"--Introduction.

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