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Evaluation of The Grell–freitas Convective Scheme In The Hurricane Weather Research and Forecasting (HWRF) Model

Abstract

The Developmental Testbed Center (DTC) tested two convective parameterization schemes in the Hurricane Weather Research and Forecasting (HWRF) Model and compared them in terms of performance of forecasting tropical cyclones (TCs). Several TC forecasts were conducted with the scale-aware Simplified Arakawa Schubert (SAS) and Grell–Freitas (GF) convective schemes over the Atlantic basin. For this sample of over 100 cases, the storm track and intensity forecasts were superior for the GF scheme compared to SAS. A case study showed improved storm structure for GF when compared with radar observations. The GF run had increased inflow in the boundary layer, which resulted in higher angular momentum. An angular momentum budget analysis shows that the difference in the contribution of the eddy transport to the total angular momentum tendency is small between the two forecasts. The main difference is in the mean transport term, especially in the boundary layer. The temperature tendencies indicate higher contribution from the microphysics and cumulus heating above the boundary layer in the GF run. A temperature budget analysis indicated that both the temperature advection and diabatic heating were the dominant terms and they were larger near the storm center in the GF run than in the SAS run. The above results support the superior performance of the GF scheme for TC intensity forecast.

Article / Publication Data
Active/Online
YES
Status
FINAL PRINT PUBLICATION
Volume
35
Available Metadata
DOI ↗
Early Online Release
May 01, 2020
Fiscal Year
NOAA IR URL ↗
Peer Reviewed
YES
Publication Name
Weather and Forecasting
Published On
June 01, 2020
Final Online Publication On
May 01, 2020
Final Print Publication On
June 01, 2020
Publisher Name
American Meteorological Society
Print Volume
35
Page Range
1017–1033
Issue
3
Submitted On
June 18, 2019
Project Type
LAB SUPPORTED
URL ↗

Authors

Authors who have authored or contributed to this publication.

  • Mrinal Biswas - lead None
    National Center for Atmospheric Research
    1850 Table Mesa Drive, Boulder, Colorado
  • Jun A. Zhang - second Aoml
    Other
  • Evelyn D. Grell - third Psl
    Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder
    NOAA/Global Systems Laboratory
  • Evan A. Kalina - fourth Gsl
    Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder
    NOAA/Global Systems Laboratory
  • Kathryn M. Newman - fifth Ncar
    National Center for Atmospheric Research
    1850 Table Mesa Drive, Boulder, Colorado
  • Ligia R. Bernardet - sixth Gsl
    Federal
  • Laurie Carson - seventh Ncar
    National Center for Atmospheric Research
    1850 Table Mesa Drive, Boulder, Colorado
  • James T. Frimel - eighth Gsl
    Cooperative Institute for Research in the Atmosphere, Colorado State University
    NOAA/Global Systems Laboratory
  • Georg A. Grell - ninth Gsl
    Federal