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Typhoon Sinlaku (2008) Radar CV Loop and Convective Contribution to Hurricane Ophelia (2005)

Explore the radar CV loop of Typhoon Sinlaku (2008) and the convective contribution to the genesis of Hurricane Ophelia (2005). Learn about deep and intense convective cells, stratiform regions, vorticity generation, and more.

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Typhoon Sinlaku (2008) Radar CV Loop and Convective Contribution to Hurricane Ophelia (2005)

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  1. Track of Typhoon Sinlaku (2008)

  2. Radar CV Loop

  3. TEAM Obs  Hot Tower

  4. Houze (2003)

  5. Houze (2003)

  6. Zipser (1969)

  7. MM5 dBZ CV composite (6 km grid) Obs dBZ (CV composite) Typhoon Nari (2001) Yang et al. (2008)

  8. Vis5D plot of 353KΘeisosurface Yang et al. (2008) Θe = 353 K overshooting hot tower vortical tube Vis5D plot of Nari’s radar echo (color) Courtesy of D.-L. Zhang

  9. Convective Contribution to the Genesis of Hurricane Ophelia (2005) • Robert A. Houze, Jr. • University of Washington • Wen-Chau Lee and Michael M. BellNational Center for Atmospheric Research Seminar at NHC, 25 August 2008

  10. ~200 km Mesoscale convective system lifecycle ~100 km

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

  12. Hurricane Ophelia (2005)

  13. 500 mb

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

  15. dBZ, vorticity, pv

  16. Stratiform region

  17. Stratiform region

  18. Stratiform region

  19. Stratiform region sounding (“onion sounding”)

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

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

  22. Conclusions • Convective cells extremely deep & intense • Downdraft outflow 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

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