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

@article{Skamarock2009TheIO,
  title={The Impact of Positive-Definite Moisture Transport on NWP Precipitation Forecasts},
  author={W. Skamarock and M. Weisman},
  journal={Monthly Weather Review},
  year={2009},
  volume={137},
  pages={488-494}
}
  • W. Skamarock, M. Weisman
  • Published 2009
  • Mathematics
  • Monthly Weather Review
  • Abstract 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… CONTINUE READING

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