Updating asynoptic data for use in objective analyses
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Updating asynoptic data for use in objective analyses

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    Case studies are used to evaluate methods for updating asynoptic meteorological observations to a synoptic time for possible use in NMC operational objective analyses. Selected radiosonde height and temperature data from the data-rich area over the United States are updated for 12-hour periods with tendency and advective methods. Persistence of 12- hour old observations is also considered. Overall results for eleven cases indicate that the tendency method exhibits smaller root-mean-square errors for the 12-hour updates than those obtained by advective methods or persistence as verified against NMC operational analyses. The importance of providing good analyses to specify the initial conditions for numerical integrations of the equations of motion is discussed in ligh-t of the dependence placed upon the forecast fields to provide first guesses for subsequent analyses. Gravitational oscillations are observed in the primitive equation 500-mb forecast height fields and are discussed as they might relate to improper short-period height updates with the tendency method. The accuracy of any update procedure is solely dependent on the accuracy of the forecasts used to correct the asynoptic reports.
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