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RAINEX: Convective Structures in Tropical Cyclones Robert Houze D. Hence, A. Didlake, B. Smull, W.-C. Lee, M. Bell Hurricane Workshop NCAR Boulder 23 February.

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Presentation on theme: "RAINEX: Convective Structures in Tropical Cyclones Robert Houze D. Hence, A. Didlake, B. Smull, W.-C. Lee, M. Bell Hurricane Workshop NCAR Boulder 23 February."— Presentation transcript:

1 RAINEX: Convective Structures in Tropical Cyclones Robert Houze D. Hence, A. Didlake, B. Smull, W.-C. Lee, M. Bell Hurricane Workshop NCAR Boulder 23 February 2010

2 Title Idealized hurricane structure

3 RAINEX (2005) Results Ophelia—genesis case Katrina—principal rainband Rita—double eyewall and moat

4 Ophelia

5

6 Convection During Ophelia Genesis ELDORA flight

7 Flight track with ELDORA

8 Convective Cell Shown by ELDORA

9

10

11 Convective contributions to genesis

12 Katrina

13 ELDORA flight along Principal Rainband

14 Principal Rainband

15 Obtained Statistics of the Cells in the Principal Rainband

16 Mean w in the Principal Rainband

17 Detail of a Cell in the Principal Rainband dBZ and Airflow Div & Vort W & vort V T & vort w dBZ

18 Consistent with the Idealization dBZ and Airflow Div & Vort W & Vort V T & Vort dBZ w Updrafts

19 Detail of a Cell in the Principal Rainband dBZ and Airflow Div & Vort W & vort V & vort w dBZ

20 Detail of Downdrafts in the Principal Rainband

21 dBZw VTVT  div Downdrafts

22 Rita

23 Double Eyewall of Rita

24 Better Understanding of the Moat

25  Vorticity Distribution the 2 Eyewalls

26 Vorticity, Units: 10 -4 s -1  Units: 10 -4 s -1 Vorticity Distribution the 2 Eyewalls

27 Vertical Velocity in 2ndary Eyewall

28 RAINEX/ELDORA Findings About Convective Structures in Hurricanes Convection during Ophelia’s genesis – Deep – Wide – Intense – Rotating – Very little downdraft

29 RAINEX/ELDORA Findings About Convective Structures in Hurricanes Principal rainband in Katrina – Alternating convective-scale elements – Updraft cells feed vorticity into jet at 4 km – Inner-edge downdrafts strengthen low-level tangential flow inward of band

30 RAINEX/ELDORA Findings About Convective Structures in Hurricanes Eyewall replacement in Rita – Moat was taking on structure of an eye – Outer eyewall had an alternating cellular structure but not like principal rainband

31 End

32 Acknowledgment This research was supported by NSF grant ATM-0743180 and NASA grant NNX07AD59G

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