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 transcript:

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

Title Idealized hurricane structure

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

Ophelia

Convection During Ophelia Genesis ELDORA flight

Flight track with ELDORA

Convective Cell Shown by ELDORA

Convective contributions to genesis

Katrina

ELDORA flight along Principal Rainband

Principal Rainband

Obtained Statistics of the Cells in the Principal Rainband

Mean w in the Principal Rainband

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

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

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

Detail of Downdrafts in the Principal Rainband

dBZw VTVT  div Downdrafts

Rita

Double Eyewall of Rita

Better Understanding of the Moat

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

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

Vertical Velocity in 2ndary Eyewall

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

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

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

End

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