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Convective Contribution to Hurricane Genesis Robert A. Houze, Jr. University of Washington

Convective Contribution to Hurricane Genesis Robert A. Houze, Jr. University of Washington Wen-Chau Lee and Michael M. Bell National Center for Atmospheric Research. UW, Atmos. Sci., Clouds and Precipitation Seminar, Seattle, 5 June 2008. Mesoscale convective system lifecycle. ~200 km.

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Convective Contribution to Hurricane Genesis Robert A. Houze, Jr. University of Washington

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  1. Convective Contribution to Hurricane Genesis • Robert A. Houze, Jr. • University of Washington • Wen-Chau Lee and Michael M. BellNational Center for Atmospheric Research UW, Atmos. Sci., Clouds and Precipitation Seminar, Seattle, 5 June 2008

  2. Mesoscale convective system lifecycle ~200 km

  3. Zipser & Gautier 78 Ritchie & Holland 97 Bister & Emanuel 97 Hendricks et al. 03 Montgomery et al. 06 Convection in an intensifying tropical depression--idealized (d)

  4. Hurricane Ophelia (2005)

  5. 500 mb

  6. NOAA Hurricane Field Program Flight Plan for “Convective Burst”

  7. dBZ, vorticity, pv

  8. Stratiform region

  9. Stratiform region

  10. Stratiform region

  11. Stratiform region sounding (“onion sounding”)

  12. 10 0 20 30 10 0 20 30 10 0 20 30 Stratiform region

  13. Conclusions • Convective cells extremely deep & intense • Downdraft convergence absent--buoyancy probably due to wind-induced mixing • PV generated in convective cells at low-mid levels • Stratiform region accumulates vorticity generated in cells • Vorticity in both convective and stratiform regions is axisymmetrized into the parent vortex • Stratiform region downdrafts not significant

  14. Extra slides

  15. Zipser & Gautier 78 Ritchie & Holland 97 Bister & Emanuel 97 Hendricks et al. 03 Montgomery et al. 06 Convection in an intensifying tropical depression--idealized (d)

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