The Impact of Positive-Definite Moisture Transport on NWP Precipitation Forecasts

  title={The Impact of Positive-Definite Moisture Transport on NWP Precipitation Forecasts},
  author={William C. Skamarock and Morris L. Weisman},
A positive-definite transport scheme for moisture is tested in a nonhydrostatic forecast model using convection-permitting resolutions. Use of the positive-definite scheme is found to significantly reduce the large positive bias in surface precipitation forecasts found in the non-positive-definite model forecasts, in particular at high precipitation thresholds. The positive-definite scheme eliminates spurious sources of water arising from the clipping of negative moisture values in the non… CONTINUE READING
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