august- september nsf noaa nrl ncar uw um agu, san francisco, 12 december 2006
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August-September
NSF NOAA NRL NCAR UW UM
AGU, San Francisco, 12 December 2006
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Katrina Ophelia Rita
Hurricanes investigated in RAINEX
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Motivation for RAINEX
Understanding Rapid Intensity Changes
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How do interactions of environment, eyewalls & rainbands in the mature storm… …lead to intensity changes like these?
rain
ban
d
Intensity change problem:Intensity change problem:
Intensity of Katrina (2005)
Max Wind Speed (knots)
24 25 2826 2927August
Willoughby 88
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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
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RitaKatrina
Model forecast of eyewall & rainbandsat 1.6 km resolution
Rain rate
Courtesy S. Chen
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Distance from vortex center
Day Day
Rain Wind
KatrinaKatrina
Courtesy S. Chen
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RitaRita
Rain WindRain
Distance from vortex center
Day
Courtesy S. Chen
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Targeted
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RAINEX Flight CoordinationRAINEX Flight Coordination
ELDORA radar
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KatrinaKatrina
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Katrina-28 AugustKatrina-28 August
ELDORA data
Barnes et al. ‘83
NRL
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Katrina-28 AugustKatrina-28 August
Confirms “Barnes” structure
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RitaRita
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RAINEX Flights in Hurricane RitaRAINEX Flights in Hurricane Rita
Cat. 5
ConcentricEyewalls
Sheared
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Concentric eyewalls in RitaConcentric eyewalls in Rita
Unpreceden
ted
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Sample cross section through eyewalls of RitaSample cross section through eyewalls of Rita
Horizontal Distance (km)
Hei
ght
(km
)
Eye
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Dropsonde in the “moat” region
1802 UTC 22 September ‘05
Rita-22 SeptemberRita-22 September
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ELDORA observations
of vorticity in the eyewalls
ELDORA observations
of vorticity in the eyewalls
Maybe first observation of “axisymmetrization”
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VorticityVorticity
ELDORA observations of the inner eyewall
ELDORA observations of the inner eyewall
Eye
VorticityVorticity
This has been called“turbo-
boosting” of the eyewall
EyeHeitht (km)
warm air
Vortex on
eyewall
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Inner eyewall Outer eyewall
Turbo-boostingTurbo-boosting
Eye
Moat formationMoat formation
2ndary eyewall
taking over
2ndary eyewall
taking overCourtesy Michael Bell
Composite of all ELDORA dataComposite of all ELDORA data
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Data AvailabilityData Availability
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Katrina Ophelia Rita
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 AccomplishmentsRAINEX Technical Accomplishments
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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 DirectionsRAINEX Science Directions
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ThanksThanks