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New grid-scale precipitation package in the -NMC nested grid model
  • Published Date:
Filetype[PDF - 1.74 MB]

  • Personal Authors:
  • Corporate Authors:
    National Meteorological Center (U.S.)
  • Series:
    Office note (National Centers for Environmental Prediction (U.S.)) ; 251
  • Document Type:
  • Description:
    "A challenge in the operational numerical modeling of grid-scale precipitation is the incorporation of the fact that such precipitation occurs in nature on a spatial scale much less than that resolvable by the forecast models. That is, this nonconvective precipitation can occur in nature in a volume represented by a grid point in a forecast model even when the mean relative humidity of that volume is less than 100%. Currently this possibility is treated in NMC's operational Limited-area Fine-mesh Model (LFM) and Movable Fine-mesh Model (MFM) by reducing the definition of saturation to less than 100%, say 90%. Alternate methods have been proposed by Mathur (personal communication), Gerrity (1981), and Phillips (1981). This paper briefly reviews the method for grid-scale condensation in the LFM and MFM and the one proposed by Phillips (1981). Results of experiments incorporating the two techniques in NMC's Nested Grid Model (NGM) will be discussed"--Introduction.

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