August- September NSF NOAA NRL NCAR UW UM AGU, San Francisco, 12 December 2006.

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Presentation transcript:

August- September NSF NOAA NRL NCAR UW UM AGU, San Francisco, 12 December 2006

KatrinaOpheliaRita Hurricanes investigated in RAINEX

Motivation for RAINEX Understanding Rapid Intensity Changes

How do interactions of environment, eyewalls & rainbands in the mature storm… … lead to intensity changes like these? rainband Intensity change problem: Intensity of Katrina (2005) Max Wind Speed (knots) August Willoughby 88

High-Resolution Multi-nested Vortex-Following Numerical Models at University of Miami: UM/RSMAS Coupled Atmos- Wave-Ocean Model 15 km 1.6 km 5 km Mini ensemble MM5 and WRF forecasts using GFS, NOGAPS, CMC, and GFDL forecast fields as initial and lateral boundary conditions Courtesy S. Chen

RitaKatrina Model forecast of eyewall & rainbands at 1.6 km resolution Rain rate Courtesy S. Chen

Distance from vortex center Day RainWind Katrina Courtesy S. Chen

Rita Rain Wind Rain Distance from vortex center Day Courtesy S. Chen

Targeted

RAINEX Flight Coordination ELDORA radar

Katrina

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

Katrina-28 August Confirms “ Barnes ” structure

Rita

RAINEX Flights in Hurricane Rita Cat. 5Concentric Eyewalls Sheared

Concentric eyewalls in Rita Unprecedented

Sample cross section through eyewalls of Rita Horizontal Distance (km)  Height (km)  Eye

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

ELDORA observations of vorticity in the eyewalls Maybe first observation of “ axisymmetrization ”

Vorticity ELDORA observations of the inner eyewall EyeVorticity This has been called “ turbo-boosting ” of the eyewall Eye Heitht (km) warm air Vortex on eyewall

Inner eyewallOuter eyewall Turbo-boosting Eye Moat formation 2ndary eyewall taking over Courtesy Michael Bell Composite of all ELDORA data

Data Availability

KatrinaOpheliaRita Three important storms observed Innovative satellite-based flight control First use of ELDORA in hurricanes Data available via NCAR field catalog Operations and data analysis aided by high-resolution modeling RAINEX Technical Accomplishments

Formation of “ moat ” documented during eyewall replacement in Rita ELDORA shows high wave no. vorticity pattern in 2ndary eyewall ELDORA confirms internal structure of rainband in Katrina High-res. model captures eyewall replacement in Rita RAINEX Science Directions

Thanks