Convective scale variations in the inner core rainbands of tropical cyclones
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Convective-scale variations in the inner-core rainbands of tropical cyclones. Houze 2010. Anthony C. Didlake, Jr. and Robert A. Houze, Jr. 30 th Conference on Hurricanes and Tropical Meteorology April 17, 2012. Hurricane Rita. S t r a t i f o r m. NCAR ELDORA radar.

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Convective-scale variations in the inner-core rainbands of tropical cyclones

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Convective scale variations in the inner core rainbands of tropical cyclones

Convective-scale variations in the inner-core rainbands of tropical cyclones

Houze 2010

Anthony C. Didlake, Jr. and Robert A. Houze, Jr.

30th Conference on Hurricanes and Tropical Meteorology

April 17, 2012


Ncar eldora radar

Hurricane Rita

S t r a t i f o r m

NCAR ELDORA radar

9/21/2005 1845-1927 Z

2 km reflectivity

dBZ

C o n v e c t i v e


Method of analysis

Method of analysis

  • Divide into “inner” and “outer” regions

  • Classify pixels as “convective” or “stratiform”

  • Take radial cross sections across convective regions

Inner

Outer


Method of analysis1

Method of analysis

  • Divide into “inner” and “outer” regions

  • Classify pixels as “convective” or “stratiform”

  • Take radial cross sections across convective regions

Inner

Outer


Composite cross sections

Composite cross sections

Tangential wind (m/s) – Shaded contours

Reflectivity (dBZ) – Contour lines

Secondary circulation – Vectors

inner regionouter region

v (m/s)

eye


Tangential wind

inner regionouter region

v (m/s)

Tangential wind

u (m/s)

Hence and Houze 2008

Radial wind


Tangential wind1

inner regionouter region

v (m/s)

Tangential wind

u (m/s)

Radial wind


Vertical velocity m s

Vertical velocity (m/s)

CAPE as a function of radius

down

total

up

Bogner et al. 2000

solid – inner

dashed – outer


Convective scale variations in the inner core rainbands of tropical cyclones

Tangential momentum tendency

inner regionouter region

blue – radial advection

red – vertical advection

green – Coriolis term

Altitude (km)

acceleration (m s-2)

acceleration (m s-2)


Convective scale variations in the inner core rainbands of tropical cyclones

Tangential momentum tendency

Total tendency

D red – inner black – outer

Altitude (km)

Altitude (km)

acceleration (m s-2)

acceleration (m s-2)


Convective scale variations in the inner core rainbands of tropical cyclones

9/21/2005 2010 Z

Rainband convective cells

Didlake and Houze 2012

9/22/2005 1800 Z

Secondary eyewall

Didlake and Houze 2011


Critical zone for secondary eyewall formation

Critical zone for secondary eyewall formation

Rainband convective cells

  • Strong winds and low CAPE

  • Confinement of jet

  • Amplification via WISHE feedback

  • Inner edge subsidence

Didlake and Houze 2012

Secondary eyewall

Didlake and Houze 2011


Conclusions

Conclusions

  • Kinematic structure varies with radius

  • Tangential jet depends on radial and vertical advection

    • Inner cell jets constrained to low levels

    • Outer cell jets occur within large range of altitudes

  • Convective cells can reach critical zone of secondary eyewall formation


Acknowledgments

Acknowledgments

  • Michael Bell

  • Wen-Chau Lee

  • Stacy Brodzik

  • NDSEG Fellowship Program

  • NSF grant ATM-0743180


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