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Vertical Distribution of Radar Reflectivity in Hurricanes in the Presence of Shear

Vertical Distribution of Radar Reflectivity in Hurricanes in the Presence of Shear. Jennifer C. DeHart, Robert A. Houze, Jr. and Deanna A. Hence University of Washington AMS Tropical Conference – 4.19.12. Image: NASA. UL. DL. UR. DR. Black et al., 2002 modified by Houze 2009.

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Vertical Distribution of Radar Reflectivity in Hurricanes in the Presence of Shear

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  1. Vertical Distribution of Radar Reflectivity in Hurricanes in the Presence of Shear Jennifer C. DeHart, Robert A. Houze, Jr. and Deanna A. Hence University of Washington AMS Tropical Conference – 4.19.12 Image: NASA

  2. UL DL UR DR Black et al., 2002 modified by Houze 2009

  3. Quantifying Vertical Structure • Hence and Houze 2011, 2012 (a,b) analyzed data from TRMM PR • Snapshots of radar reflectivity • 10+ years of data • Contoured by Frequency Altitude Diagrams (CFADs) • 200-850hPa shear from NCEP

  4. Height (km) Reflectivity (dBZ) Hence and Houze 2011

  5. Hence and Houze 2011

  6. DL DR 8 Shear 6 2 Height (km) UL UR 8 6 2 30 40 30 40 Courtesy of D. Hence Reflectivity (dBZ)

  7. Field Campaigns • RAINEX (2005) • Katrina: 8/28 • NOAA 43 • IFEX/GRIP (2010) • Earl: 8/29, 8/30, 9/1, 9/2 • NOAA 42 & 43

  8. Hurricane Katrina – 8/28/2005

  9. Shear

  10. Shear

  11. Hurricane Earl – 8/30/2010

  12. Shear

  13. Hurricane Earl – 8/30/2010

  14. Shear

  15. Conclusions • Structures of Katrina and Earl at strong intensities share similarities with statistics • Intense low-level reflectivities • Early sampling of Earl on 8/30 did not • Shear calculation issue? • Rapid Intensification? • Circulation pattern?

  16. EndThis research was supported by NSF grant # ATM-0743180 and NASA grant #NNX09AM73G

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