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Hurricane Charlie Radar Images

VORTRAC – A Utility to Deduce Central Pressure and Radius of Maximum Wind of Landfalling Tropical Cyclones Using WSR-88D Data Wen-Chau Lee NCAR/EOL Paul Harasti UCAR/NRL Michael Bell NCAR/EOL. Hurricane Charlie Radar Images. VTD-derived Axisymmetric Quantities:. Vertical Velocity.

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Hurricane Charlie Radar Images

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  1. VORTRAC – A Utility to Deduce Central Pressure and Radius of Maximum Wind of Landfalling Tropical Cyclones Using WSR-88D DataWen-Chau Lee NCAR/EOL Paul Harasti UCAR/NRL Michael Bell NCAR/EOL

  2. Hurricane Charlie Radar Images

  3. VTD-derived Axisymmetric Quantities: Vertical Velocity Angular Momentum Pressure Gradient

  4. Charlie X: 0.56 km Y: 0.70 km RMW: 0.82 km VT: 1.9 m/s Katrina X: 0.86 km Y: 2.58 km RMW: 4.38 km VT: 9.00 m/s Confidence Level

  5. VCP 12 VCP 121 WSR-88D Scanning Sequence

  6. GBVTD Formulation: Vd: Doppler velocities VM: Mean flow VT: Tangential wind VR: Radial velocity w: Vertical velocity vt: Terminal velocity : Elevation angle : Angle in GBVTD coordinate : Azimuth angle M: Math angle of the mean flow Cn: Amplitude of cosine wavenumber n Sn: Amplitude of sine wavenumber n

  7. HVVP Mean Wind Profiles

  8. The GBVTD TechniqueLee, Jou, Chang, and Deng (1999)

  9. VTD Formulation For L=3, M=N=2:

  10. Charley (2004)

  11. What have we learned from Charley? • Rapid intensification can occur near landfall • Coastal Doppler radar can effectively detect rapid intensification if they are operated properly • Vertical structure of the eyewall can provide indications on intensity change (e.g., more scans at lower angles are needed) • Most intense winds may occur in the eyewall but severe storms (e.g., tornado) may occur in the outer rainband precedes the arrival of the eye • Longer range is preferred over higher Nyquist velocity when setting scanning parameters

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