August- September NSF NOAA NRL NCAR UW UM 27th Conference on Hurricanes and Tropical Meteorology, Monterey, CA, 27 April 2006.

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Presentation transcript:

August- September NSF NOAA NRL NCAR UW UM 27th Conference on Hurricanes and Tropical Meteorology, Monterey, CA, 27 April 2006

Shuyi ChenR. Houze Wen-Chau LeeJim Moore

KatrinaOpheliaRita Hurricanes investigated in RAINEX

Motivation for RAINEX Understanding Rapid Intensity Changes

Cat 2 Cat 3 Cat 5 Cat 4 Day Famous Rapidly Intensifing Storm Hurricane Opal (1995) Pressure drop How do interactions of eyewalls & rainbands in the mature storm… … lead to intensity changes like these? rainband Intensity change problem:

RAINEX Flight Coordination ELDORA radar

Plan--target dropsondes and Doppler

Katrina

Katrina-28 August NRL convective upwind stratiform downwind Atlas et al. ‘ 63

Katrina-28 August ELDORA data Ref Vel Barnes et al. ‘ 83 NRL

Katrina-28 August Confirms “ Barnes ” structure

Rita

RAINEX Flights in Hurricane Rita

Rita- 21 September Intensifying to Cat. 5

0 ºC Rita- 21 September Intensifying to Cat. 5

Dropsondes EyeEyewall Rita- 21 September Intensifying to Cat. 5

Rita- 22 September-Concentric Eyewalls

ELDORA compositeKossin et al vorticity Rita- 22 September-Concentric Eyewalls

Dropsonde in the “ moat ” region 1802 UTC 22 September ‘05 Rita- 22 September-Concentric Eyewalls

Rita- 23 September-Sheared Shear Rogers et al. ‘ 03

Ophelia

A B Ophelia-9 September-Dry Midlevel Inflow B A Dry air Ref Vel

Data Availability

CONCLUSIONS RAINEX Notables: 3 hurricanes—Katrina, Ophelia, & Rita Innovative satellite-based flight control First use of ELDORA in a hurricane Data available via NCAR Field Catalog Katrina and Rita details: K & R’s spiral rainbands had Atlas & Barnes structures R sampled in 3 stages: rapid int., 2nd eyewall, shear Echo cores in eyewalls were linear & oblique Moat region had eye-like sounding Dry air entered in subsiding mesoscale midlevel inflows KatrinaOpheliaRita

Thanks