• Bosart, L. F., Bracken W. E. , Molinari J. , Velden C. S. , and Black P. G. , 2000: Environmental influences on the rapid intensification of Hurricane Opal (1995) over the Gulf of Mexico. Mon. Wea. Rev., 128 , 322352.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Challa, M., Pfeffer R. L. , Zhao Q. , and Chang S. W. , 1998: Can eddy fluxes serve as a catalyst for hurricane and typhoon formation? J. Atmos. Sci., 55 , 22012218.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Chan, J. C. L., Duan Y. H. , and Shay L. K. , 2001: Tropical cyclone intensity change from a simple ocean–atmosphere coupled model. J. Atmos. Sci., 58 , 154172.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Chen, L. S., and Ding Y. H. , 1979: A General Description of Typhoon in the Northwestern Pacific. China Meteorology Press, 491 pp.

  • DeMaria, M., and Kaplan J. , 1999: An updated Statistical Hurricane Intensity Prediction Scheme (SHIPS) for the Atlantic and eastern North Pacific basins. Wea. Forecasting, 14 , 326337.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • DeMaria, M., Baik J-J. , and Kaplan J. , 1993: Upper-level eddy angular momentum fluxes and tropical cyclone intensity change. J. Atmos. Sci., 50 , 11331147.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Elsberry, R. L., and Jeffries R. , 1996: Vertical wind shear influences on tropical cyclone formation and intensification during TCM-92 and TCM-93. Mon. Wea. Rev., 124 , 13741387.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Fitzpatrick, P. J., 1997: Understanding and forecasting tropical cyclone intensity change with the Typhoon Intensity Prediction Scheme (TIPS). Wea. Forecasting, 12 , 826846.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Frank, W. M., and Ritchie E. A. , 2001: Effects of vertical wind shear on hurricane intensity and structure. Mon. Wea. Rev., 129 , 22492269.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Franklin, J. L., Lord S. J. , Feuer S. E. , and Marks F. D. , 1993: The kinematic structure of Hurricane Gloria (1985) determined from nested analyses of dropwindsonde and Doppler radar data. Mon. Wea. Rev., 121 , 24332451.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Gallina, G. M., and Velden C. S. , 2002: Environmental vertical wind shear and tropical cyclone intensity change utilizing enhanced satellite derived wind information. Preprints, 25th Conf. on Hurricanes and Tropical Meteorology, San Diego, CA, Amer. Meteor. Soc., 172–173.

  • Hanley, D. E., Molinari J. , and Keyser D. , 2001: A composite study of the interactions between tropical cyclones and upper-tropospheric troughs. Mon. Wea. Rev., 129 , 25702584.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Holland, G., Ed. 1993: Global guide to tropical cyclone forecasting. WMO/TD-No. 560, World Meteorological Organization, Geneva, Switzerland.

  • Holland, G. J., and Merrill R. T. , 1984: On the dynamics of tropical cyclone structural changes. Quart. J. Roy. Meteor. Soc., 110 , 723745.

  • McBride, J. L., and Zehr R. , 1981: Observational analysis of tropical cyclone formation. Part II: Comparison of non-developing versus developing systems. J. Atmos. Sci., 38 , 11321151.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Molinari, J., and Vollaro D. , 1989: External influences on hurricane intensity. Part I: Outflow layer eddy angular momentum fluxes. J. Atmos. Sci., 46 , 10931105.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Molinari, J., and Vollaro D. , 1990: External influences on hurricane intensity. Part II: Vertical structure and response of the hurricane vortex. J. Atmos. Sci., 47 , 19021918.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Ritchie, E. A., 2002: Environmental effects. Topic Chairman and Rapporteur Reports of the Fifth WMO International Workshop on Tropical Cyclones (IWTC-V), WMO/TD 1136.

  • Rodgers, E. B., Stout J. , and Steranka J. , 1986: Upper-tropospheric and lower-statospheric dynamics associated with tropical cyclones as inferred from total ozone measurements. Preprints, Second Conf. on Satellite Meteorology/Remote Sensing and Applications, Williamsburg, VA, Amer. Meteor. Soc., 382–387.

  • Rodgers, E. B., Chang S. W. , Stout J. , Steranka J. , and Shi J. J. , 1991: Satellite observations of variations in tropical cyclone convection caused by upper-tropospheric troughs. J. Appl. Meteor., 30 , 11631184.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Rodgers, E. B., Olson W. S. , Mohan Karyampudi V. , and Pierce H. F. , 1998: Satellite-derived latent heating distribution and environmental influences in Hurricane Opal (1995). Mon. Wea. Rev., 126 , 12291247.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Shi, J. J., Chang S. W-J. , and Raman S. , 1990: A numerical study of the outflow layer of tropical cyclones. Mon. Wea. Rev., 118 , 20422055.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Shi, J. J., Chang S. , and Raman S. , 1997: Interaction between Hurricane Florence (1988) and an upper-tropospheric westerly trough. J. Atmos. Sci., 54 , 12311247.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Titley, D. W., and Elsberry R. L. , 2000: Large intensity changes in tropical cyclones: A case study of supertyphoon Flo during TCM-90. Mon. Wea. Rev., 128 , 35563573.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Wu, C-C., and Cheng H-J. , 1999: An observational study of environmental influences on the intensity changes of Typhoons Flo (1990) and Gene (1990). Mon. Wea. Rev., 127 , 30033031.

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Yu, H., Fei L. , and Duan Y. H. , 2002: Favorable large-scale conditions for rapid intensification of typhoon Bill (1988) before its landfall. Acta Meteor. Sinica, 60 , (Suppl.). 7887.

    • Search Google Scholar
    • Export Citation
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Effect of TC–Trough Interaction on the Intensity Change of Two Typhoons

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  • 1 Shanghai Typhoon Institute, Shanghai, China
  • | 2 Typhoon Research Center, Department of Atmospheric Science, Kongju National University, Kongju, Chungnam, Korea
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Abstract

Using large-scale analyses, the effect of tropical cyclone–trough interaction on tropical cyclone (TC) intensity change is readdressed by studying the evolution of upper-level eddy flux convergence (EFC) of angular momentum and vertical wind shear for two TCs in the western North Pacific [Typhoons Prapiroon (2000) and Olga (1999)]. Major findings include the following: 1) In spite of decreasing SST, the cyclonic inflow associated with a midlatitude trough should have played an important role in Prapiroon’s intensification to its maximum intensity and the maintenance after recurvature through an increase in EFC. The accompanied large vertical wind shear is concentrated in a shallow layer in the upper troposphere. 2) Although Olga also recurved downstream of a midlatitude trough, its development and maintenance were not strongly influenced by the trough. A TC could maintain itself in an environment with or without upper-level eddy momentum forcing. 3) Both TCs started to decay over cold SST in a large EFC and vertical wind shear environment imposed by the trough. 4) Uncertainty of input adds difficulties in quantitative TC intensity forecasting.

Corresponding author address: Ms. Hui Yu, Shanghai Typhoon Institute, No. 166, Pu Xi Road, Shanghai, 200030, China. Email: yuh@mail.typhoon.gov.cn

Abstract

Using large-scale analyses, the effect of tropical cyclone–trough interaction on tropical cyclone (TC) intensity change is readdressed by studying the evolution of upper-level eddy flux convergence (EFC) of angular momentum and vertical wind shear for two TCs in the western North Pacific [Typhoons Prapiroon (2000) and Olga (1999)]. Major findings include the following: 1) In spite of decreasing SST, the cyclonic inflow associated with a midlatitude trough should have played an important role in Prapiroon’s intensification to its maximum intensity and the maintenance after recurvature through an increase in EFC. The accompanied large vertical wind shear is concentrated in a shallow layer in the upper troposphere. 2) Although Olga also recurved downstream of a midlatitude trough, its development and maintenance were not strongly influenced by the trough. A TC could maintain itself in an environment with or without upper-level eddy momentum forcing. 3) Both TCs started to decay over cold SST in a large EFC and vertical wind shear environment imposed by the trough. 4) Uncertainty of input adds difficulties in quantitative TC intensity forecasting.

Corresponding author address: Ms. Hui Yu, Shanghai Typhoon Institute, No. 166, Pu Xi Road, Shanghai, 200030, China. Email: yuh@mail.typhoon.gov.cn

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